{"id":31,"date":"2014-05-26T12:06:23","date_gmt":"2014-05-26T12:06:23","guid":{"rendered":"http:\/\/vkrastev1blog.com\/?p=31"},"modified":"2014-05-26T15:36:27","modified_gmt":"2014-05-26T15:36:27","slug":"java-generics-explained-in-short-form-with-examples","status":"publish","type":"post","link":"https:\/\/vkrastev1blog.com\/2014\/05\/26\/java-generics-explained-in-short-form-with-examples\/","title":{"rendered":"Java \u6cdb\u578b\u901a\u8fc7\u793a\u4f8b\u8fdb\u884c\u7b80\u77ed\u89e3\u91ca"},"content":{"rendered":"<p>\u8acb\u53c3\u95b1\u6b64\u5e38\u898b\u554f\u984c\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\uff1a<\/p>\n<p><a href=\"http:\/\/www.angelikalanger.com\/GenericsFAQ\/JavaGenericsFAQ.html#SECTION1\" rel=\"nofollow\">http:\/\/www.angelikalanger.com\/GenericsFAQ\/JavaGenericsFAQ.html#SECTION1<\/a><\/p>\n<p>\u4ee5\u4e0b\u662f\u6b64\u5e38\u898b\u554f\u984c\u89e3\u7b54\u4e2d\u7684\u4e00\u4e9b\u8981\u9ede\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u901a\u7528\u985e\u578b\uff09\uff1a<\/p>\n<blockquote><p><tt> \u985e Pair&lt;X,Y&gt; {\u00a0<\/tt><br \/>\n<tt> \u00a0 \u9996\u5148\u662f\u79c1\u6709X\uff1b<\/tt><br \/>\n<tt> \u00a0 \u79c1\u4ebaY\u7b2c\u4e8c\uff1b<\/tt><tt> \u00a0 \u516c\u5171\u5c0d\uff08X a1\uff0cY a2\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u9996\u5148 = a1;<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u7b2c\u4e8c\u500b=a2\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 public X getFirst() { \u5148\u56de\u50b3; }<\/tt><br \/>\n<tt> \u00a0 public Y getSecond() { \u56de\u50b3\u7b2c\u4e8c\u500b\uff1b }<\/tt><br \/>\n<tt> \u00a0 \u516c\u7121\u6548setFirst\uff08X arg\uff09{\u7b2c\u4e00= arg; }<\/tt><br \/>\n<tt> \u00a0 \u516c\u7121\u6548setSecond\uff08Y arg\uff09{\u7b2c\u4e8c= arg; }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u73ed\u7d1a <tt> \u4e00\u5c0d<\/tt> \u6709\u5169\u500b\u578b\u5225\u53c3\u6578 <tt> X <\/tt> \u548c <tt> \u662f<\/tt> \u3002\u00a0 \u7576\u6cdb\u578b\u985e\u578b\u6642\uff0c\u5b83\u5011\u88ab\u985e\u578b\u53c3\u6578\u66ff\u63db <tt> \u4e00\u5c0d<\/tt> \u88ab\u5be6\u4f8b\u5316\u3002\u4f8b\u5982\uff0c\u5728\u8072\u660e\u4e2d <tt> \u5c0d&lt;\u5b57\u4e32\uff0c\u65e5\u671f&gt;<\/tt> \u985e\u578b\u53c3\u6578 <tt> X<\/tt> \u88ab\u985e\u578b\u53c3\u6578\u66ff\u63db <tt> \u7d30\u7e69<\/tt> \u548c <tt> \u662f<\/tt> \u88ab\u66ff\u63db\u70ba\u00a0 <tt> \u65e5\u671f<\/tt> \u3002<br \/>\n\u6a19\u8b58\u7b26\u7684\u7bc4\u570d <tt> X <\/tt> \u548c <tt> \u662f<\/tt> \u662f<b> <i> <\/i> <\/b> \u985e\u5225\u7684\u6574\u500b\u5b9a\u7fa9\u3002\u00a0 \u5728\u6b64\u7bc4\u570d\u5167\uff0c\u5169\u7a2e\u578b\u5225\u53c3\u6578 <tt> X <\/tt> \u548c <tt> \u662f<\/tt> \u50cf\u985e\u578b\u4e00\u6a23\u4f7f\u7528\uff08\u6709\u4e00\u4e9b\u9650\u5236\uff09\u3002\u5728\u4e0a\u9762\u7684\u7bc4\u4f8b\u4e2d\uff0c\u985e\u578b\u53c3\u6578\u7528\u4f5c\u5be6\u4f8b\u65b9\u6cd5\u7684\u53c3\u6578\u548c\u50b3\u56de\u985e\u578b\u4ee5\u53ca\u5be6\u4f8b\u6b04\u4f4d\u7684\u985e\u578b\u3002<br \/>\n\u985e\u578b\u53c3\u6578\u53ef\u4ee5\u7528\u908a\u754c\u4f86\u5ba3\u544a\u3002\u908a\u754c\u5141\u8a31\u5b58\u53d6\u985e\u578b\u53c3\u6578\u6240\u4ee3\u8868\u7684\u672a\u77e5\u985e\u578b\u7684\u65b9\u6cd5\u3002\u5728\u6211\u5011\u7684\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u4e0d\u547c\u53eb\u4efb\u4f55\u672a\u77e5\u985e\u578b\u7684\u65b9\u6cd5 <tt> X <\/tt> \u548c <tt> \u662f<\/tt> \u3002\u56e0\u6b64\uff0c\u9019\u5169\u500b\u578b\u5225\u53c3\u6578\u662f\u7121\u754c\u7684\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u5177\u9ad4\u53c3\u6578\u5316\u985e\u578b\uff09\uff1a<\/p>\n<blockquote><p><tt> \u516c\u5171\u7121\u6548\u5217\u5370\u5c0d\uff08<b> <span style=\"color:#000099;\"> \u4e00\u5c0d&lt;\u4e32\uff0c\u9577&gt;<\/span> <\/b> \u4e00\u5c0d\uff09 {<\/tt><br \/>\n<tt> \u00a0 System.out.println(\"(\"+pair.getFirst()+\",\"+pair.getSecond()+\")\");<\/tt><br \/>\n<tt> }<\/tt><tt> <b> <span style=\"color:#000099;\"> \u4e00\u5c0d&lt;\u4e32\uff0c\u9577&gt;<\/span> <\/b> \u9650\u5236=\u65b0 <b> <span style=\"color:#000099;\"> \u4e00\u5c0d&lt;\u4e32\uff0c\u9577&gt;<\/span> <\/b> \uff08\u201c\u6700\u5927\u201d\uff0c1024L\uff09\uff1b<\/tt><br \/>\n<tt> \u5217\u5370\u5c0d\uff08\u9650\u5236\uff09\uff1b<\/tt><\/p><\/blockquote>\n<p>\u7bc4\u4f8b\uff08\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\uff09\uff1a<\/p>\n<blockquote>\n<blockquote><p><tt> \u516c\u5171\u7121\u6548\u5217\u5370\u5c0d\uff08<b> <span style=\"color:#000099;\"> \u5c0d&lt;?,?&gt;<\/span> <\/b> \u4e00\u5c0d\uff09 {<\/tt><br \/>\n<tt> \u00a0 System.out.println(\"(\"+pair.getFirst()+\",\"+pair.getSecond()+\")\");<\/tt><br \/>\n<tt> }<\/tt><tt> <b> <span style=\"color:#000099;\"> \u5c0d&lt;?,?&gt;<\/span> <\/b> \u9650\u5236=\u65b0 <b> <span style=\"color:#000099;\"> \u4e00\u5c0d&lt;\u4e32\uff0c\u9577&gt;<\/span> <\/b> \uff08\u201c\u6700\u5927\u201d\uff0c1024L\uff09\uff1b<\/tt><br \/>\n<tt> \u5217\u5370\u5c0d\uff08\u9650\u5236\uff09\uff1b<\/tt><\/p><\/blockquote>\n<\/blockquote>\n<p>\u6cdb\u578b\u985e\u578b\u7684\u6240\u6709\u5be6\u4f8b\u5316\u90fd\u5171\u7528\u76f8\u540c\u7684\u57f7\u884c\u6642\u9593\u985e\u578b\u8868\u793a\uff0c\u5373\u539f\u59cb\u985e\u578b\u7684\u8868\u793a\u3002\u4f8b\u5982\uff0c\u6cdb\u578b\u985e\u578b\u7684\u5be6\u4f8b\u5316 <tt> \u6e05\u55ae<\/tt> \uff0c \u4f8b\u5982 <tt> \u5217\u8868&lt;\u65e5\u671f&gt;<\/tt> , <tt> \u5217\u8868&lt;\u5b57\u4e32&gt;<\/tt> , <tt> \u5217\u8868&lt;\u9577&gt;<\/tt> \u7b49\u5728\u7de8\u8b6f\u6642\u6709\u4e0d\u540c\u7684\u975c\u614b\u985e\u578b\uff0c\u4f46\u52d5\u614b\u985e\u578b\u76f8\u540c <tt> \u6e05\u55ae <\/tt> \u5728\u904b\u884c\u6642\u3002<\/p>\n<p>\u6f14\u54e1\u9663\u5bb9\u7531\u5169\u90e8\u5206\u7d44\u6210\uff1a<\/p>\n<ul>\n<li>\u7de8\u8b6f\u5668\u5728\u7de8\u8b6f\u6642\u57f7\u884c\u7684\u975c\u614b\u578b\u5225\u6aa2\u67e5<\/li>\n<li>\u865b\u64ec\u6a5f\u5668\u5728\u904b\u884c\u6642\u57f7\u884c\u7684\u52d5\u614b\u985e\u578b\u6aa2\u67e5\u3002<\/li>\n<\/ul>\n<p>\u975c\u614b\u90e8\u5206\u5c0d\u7121\u6cd5\u6210\u529f\u7684\u7121\u610f\u7fa9\u7684\u8f49\u63db\u9032\u884c\u6392\u5e8f\uff0c\u4f8b\u5982\u4f86\u81ea <tt> \u7d30\u7e69<\/tt> \u90a3 <tt> \u65e5\u671f<\/tt> \u6216\u4f86\u81ea <tt> \u5217\u8868&lt;\u5b57\u4e32&gt;<\/tt> \u90a3 <tt> \u5217\u8868&lt;\u65e5\u671f&gt;<\/tt> \u3002<\/p>\n<p>\u52d5\u614b\u90e8\u5206\u4f7f\u7528\u904b\u884c\u6642\u985e\u578b\u8cc7\u8a0a\u4e26\u5728\u904b\u884c\u6642\u57f7\u884c\u985e\u578b\u6aa2\u67e5\u3002\u00a0 \u5b83\u63d0\u51fa\u4e86\u4e00\u500b <tt> \u985e\u5225\u8f49\u63db\u7570\u5e38<\/tt> \u5982\u679c\u7269\u4ef6\u7684\u52d5\u614b\u985e\u578b\u4e0d\u662f\u5f37\u5236\u8f49\u63db\u7684\u76ee\u6a19\u985e\u578b\uff08\u6216\u76ee\u6a19\u985e\u578b\u7684\u5b50\u985e\u578b\uff09\u3002\u5177\u6709\u52d5\u614b\u90e8\u5206\u7684\u6f14\u54e1\u7684\u4f8b\u5b50\u662f <tt> \u76ee\u7684<\/tt> \u90a3 <tt> \u7d30\u7e69<\/tt> \u6216\u4f86\u81ea <tt> \u76ee\u7684<\/tt> \u90a3 <tt> \u5217\u8868&lt;\u5b57\u4e32&gt;<\/tt> \u3002\u00a0 \u9019\u4e9b\u5c31\u662f\u6240\u8b02\u7684\u5411\u4e0b\u8f49\u578b\uff0c\u5f9e\u8d85\u985e\u578b\u5411\u4e0b\u8f49\u578b\u70ba\u5b50\u985e\u578b\u3002<\/p>\n<p>\u5177\u9ad4\u53c3\u6578\u5316\u985e\u578b\u7684\u7bc4\u4f8b\u662f <tt> \u5217\u8868&lt;\u5b57\u4e32&gt;<\/tt> , <tt> \u5730\u5716&lt;\u5b57\u4e32\uff0c\u65e5\u671f&gt;<\/tt> \uff0c\u4f46\u4e0d\u662f <tt> \u5217\u51fa&lt;\uff1f\u64f4\u5145 Number&gt;<\/tt> \u6216\u8005 <tt> Map&lt;String,?&gt;<\/tt> \u3002<\/p>\n<p>\u6709\u6642\u9810\u8a08 <tt> \u5217\u8868&lt;\u7269\u4ef6&gt;<\/tt> \u5c07\u662f a \u7684\u8d85\u985e\u578b <tt> \u5217\u8868&lt;\u5b57\u4e32&gt;<\/tt> \uff0c \u56e0\u70ba <tt> \u76ee\u7684<\/tt> \u662f\u4e00\u500b\u8d85\u985e\u578b <tt> \u7d30\u7e69<\/tt> \u3002\u00a0 \u9019\u7a2e\u671f\u671b\u6e90\u81ea\u65bc\u9019\u6a23\u4e00\u500b\u4e8b\u5be6\uff1a\u6578\u7d44\u5b58\u5728\u9019\u7a2e\u985e\u578b\u7684\u95dc\u4fc2\uff1a\u00a0 <tt> \u76ee\u7684[]<\/tt> \u662f\u4e00\u500b\u8d85\u985e\u578b <tt> \u7d30\u7e69[]<\/tt> \uff0c \u56e0\u70ba <tt> \u76ee\u7684<\/tt> \u662f\u4e00\u500b\u8d85\u985e\u578b <tt> \u7d30\u7e69<\/tt> \u3002 \uff08\u9019\u7a2e\u985e\u578b\u7684\u95dc\u4fc2\u7a31\u70ba <i> \u5354\u65b9\u5dee<\/i> .) \u7d44\u4ef6\u985e\u578b\u7684\u7236\u5b50\u985e\u578b\u95dc\u4fc2\u64f4\u5c55\u5230\u5c0d\u61c9\u7684\u9663\u5217\u985e\u578b\u3002\u5c0d\u65bc\u6cdb\u578b\u985e\u578b\u7684\u5be6\u4f8b\u5316\uff0c\u4e0d\u5b58\u5728\u9019\u6a23\u7684\u578b\u5225\u95dc\u4fc2\u3002 \uff08\u53c3\u6578\u5316\u985e\u578b\u662f <i> \u4e0d\u662f<\/i> \u5354\u8b8a\u3002 \uff09<\/p>\n<p>\u540c\u4e00\u6cdb\u578b\u985e\u578b\u7684\u5be6\u4f8b\u4e4b\u9593\u7f3a\u4e4f\u8d85\u7d1a\u5b50\u985e\u578b\u95dc\u4fc2\u6703\u7522\u751f\u5404\u7a2e\u5f8c\u679c\u3002\u00a0 \u9019\u662f\u4e00\u500b\u4f8b\u5b50\u3002<\/p>\n<p>\u4f8b\u5b50\uff1a<\/p>\n<p><tt> \u7121\u6548 printAll(ArrayList&lt;Object&gt; c) {<\/tt><br \/>\n<tt> \u00a0 for (\u7269\u4ef6 o : c)\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 System.out.println(o);<\/tt><br \/>\n<tt> }<\/tt><tt> ArrayList&lt;String&gt; \u6e05\u55ae = \u65b0 ArrayList&lt;String&gt;();<\/tt><br \/>\n<tt> ....\u586b\u5beb\u6e05\u55ae...<\/tt><br \/>\n<tt> \u5217\u5370\u5168\u90e8\uff08\u5217\u8868\uff09\uff1b\u00a0\u00a0 \/\/ \u932f\u8aa4<\/tt><\/p>\n<p>\u4e00\u500b <tt> ArrayList&lt;String&gt;<\/tt> \u7269\u4ef6\u4e0d\u80fd\u4f5c\u70ba\u53c3\u6578\u50b3\u905e\u7d66\u9700\u8981 <tt> ArrayList&lt;Object&gt;<\/tt> \u56e0\u70ba\u9019\u5169\u7a2e\u985e\u578b\u662f\u540c\u4e00\u6cdb\u578b\u985e\u578b\u7684\u5be6\u4f8b\u5316\uff0c\u4f46\u662f\u5c0d\u65bc <i> \u4e0d\u540c\u7684<\/i> \u985e\u578b\u53c3\u6578\uff0c\u56e0\u6b64\u5b83\u5011\u5f7c\u6b64\u4e0d\u76f8\u5bb9\u3002<\/p>\n<p>\u5177\u9ad4\u53c3\u6578\u5316\u985e\u578b\u662f\u6cdb\u578b\u985e\u578b\u7684\u5177\u9ad4\u5be6\u4f8b\u3002\u00a0 \u5b83\u5011\u5e7e\u4e4e\u662f\u76f8\u4f3c\u7684\u985e\u578b\uff1b\u53ea\u6709\u4e00\u4e9b\u9650\u5236\u3002\u00a0 \u5b83\u5011\u4e0d\u80fd\u7528\u65bc\u4ee5\u4e0b\u76ee\u7684\uff1a<\/p>\n<ul>\n<li>\u7528\u65bc\u5efa\u7acb\u6578\u7d44<\/li>\n<li>\u5728\u4f8b\u5916\u8655\u7406\u4e2d<\/li>\n<li>\u5728\u985e\u5225\u6587\u5b57\u4e2d<\/li>\n<li>\u5728\u4e00\u500b <tt> \u5be6\u4f8b\u5316<\/tt> \u8868\u9054<\/li>\n<\/ul>\n<p>\u4fdd\u5b58\u985e\u578b\u70ba\u5177\u9ad4\u53c3\u6578\u5316\u985e\u578b\u7684\u5143\u7d20\u7684\u9663\u5217\u662f\u975e\u6cd5\u7684\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u975e\u6cd5\u6578\u7d44\u985e\u578b\uff09\uff1a<\/p>\n<p><tt> \u975c\u614b\u7121\u6548\u6e2c\u8a66\uff08\uff09{<\/tt><br \/>\n<tt> \u00a0 <b> <span style=\"color:#660000;\"> \u5c0d&lt;\u6574\u6578,\u6574\u6578&gt;[]<\/span> <\/b> intPairArr = \u65b0 <b> <span style=\"color:#660000;\"> \u5c0d&lt;\u6574\u6578,\u6574\u6578&gt;[10]<\/span> <\/b> ; <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0 addElements(intPairArr);\u00a0<\/tt><br \/>\n<tt> \u00a0 Pair&lt;Integer,Integer&gt; \u5c0d = intPairArr[1];<\/tt><br \/>\n<tt> \u00a0 \u6574\u6578 i =pair.getFirst();<\/tt><br \/>\n<tt> \u00a0 \u5c0d.setSecond(i);<\/tt><br \/>\n<tt> }<\/tt><br \/>\n<tt> \u975c\u614b\u7121\u6548\u65b0\u589e\u5143\u7d20\uff08<b> \u76ee\u7684[]<\/b> objArr) {<\/tt><br \/>\n<tt> \u00a0 objArr[0] = \u65b0 Pair&lt;Integer,Integer&gt;(0,0);<\/tt><br \/>\n<tt> \u00a0 objArr[1] = new Pair&lt;String,String&gt;(\"\",\"\");\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ \u61c9\u56e0 ArrayStoreException \u5931\u6557<\/tt><br \/>\n<tt> }<\/tt><\/p>\n<p>\u7de8\u8b6f\u5668\u7981\u6b62\u5efa\u7acb\u5176\u5143\u4ef6\u985e\u578b\u662f\u7279\u5b9a\u53c3\u6578\u5316\u985e\u578b\u7684\u6578\u7d44\uff0c\u4f8b\u5982 <tt> \u5c0d&lt;\u6574\u6578,\u6574\u6578&gt;<\/tt> \u5728\u6211\u5011\u7684\u4f8b\u5b50\u4e2d\u3002\u00a0 \u6211\u5011\u5728\u524d\u9762\u7684\u689d\u76ee\u4e2d\u8a0e\u8ad6\u4e86\u70ba\u4ec0\u9ebc\u7de8\u8b6f\u5668\u9650\u5b9a\u4e00\u500b\u662f\u5408\u7406\u7684<span style=\"color:#000000;\"> <tt> \u5c0d&lt;\u6574\u6578,\u6574\u6578&gt;[]<\/tt> <\/span> \u4f5c\u70ba\u975e\u6cd5\u7684\u3002\u00a0 \u95dc\u9375\u554f\u984c\u662f\u7de8\u8b6f\u5668\u548c\u57f7\u884c\u6642\u9593\u7cfb\u7d71\u5fc5\u9808\u78ba\u4fdd\u9663\u5217\u662f\u4e00\u500b <i> \u540c\u8cea<\/i> \u76f8\u540c\u985e\u578b\u7684\u5143\u7d20\u7684\u5e8f\u5217\u3002\u00a0 \u5176\u4e2d\u4e00\u7a2e\u985e\u578b\u6aa2\u67e5\uff0c\u5373\u865b\u64ec\u6a5f\u5668\u5728\u57f7\u884c\u6642\u57f7\u884c\u7684\u9663\u5217\u5132\u5b58\u6aa2\u67e5\uff0c\u7121\u6cd5\u5075\u6e2c\u5230\u5916\u4f86\u5143\u7d20\u7684\u9055\u898f\u63d2\u5165\u3002\u5728\u7bc4\u4f8b\u4e2d\uff0c\u7b2c\u4e8c\u500b\u63d2\u5165 <tt> \u65b0\u589e\u5143\u7d20<\/tt> \u65b9\u6cd5\u61c9\u8a72\u5931\u6557\uff0c\u56e0\u70ba\u5b83\u5011\u5c07\u4e00\u5c0d\u5b57\u4e32\u6dfb\u52a0\u5230\u6574\u6578\u503c\u6578\u7d44\u4e2d\uff0c\u4f46\u5b83\u4e0d\u6703\u6309\u9810\u671f\u5931\u6557\u3002\u539f\u56e0\u5df2\u5728\u524d\u9762\u7684\u689d\u76ee\u4e2d\u8a0e\u8ad6\u904e\u3002<\/p>\n<p>\u5982\u679c\u6211\u5011\u4e0d\u80fd\u4f7f\u7528\u4fdd\u5b58\u985e\u578b\u70ba\u7279\u5b9a\u53c3\u6578\u5316\u985e\u578b\u7684\u5143\u7d20\u7684\u6578\u7d44\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ec0\u9ebc\u4f5c\u70ba\u89e3\u6c7a\u65b9\u6cd5\uff1f<\/p>\n<p>\u8b93\u6211\u5011\u8003\u616e 3 \u7a2e\u53ef\u80fd\u7684\u89e3\u6c7a\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li>\u539f\u59cb\u578b\u5225\u6578\u7d44<\/li>\n<li>\u7121\u754c\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u7684\u6578\u7d44<\/li>\n<li>\u96c6\u5408\u800c\u4e0d\u662f\u6578\u7d44<\/li>\n<\/ul>\n<p>\u96d6\u7136\u5177\u9ad4\u53c3\u6578\u5316\u985e\u578b\u7684\u9663\u5217\u662f\u975e\u6cd5\u7684\uff0c\u4f46\u5177\u9ad4\u53c3\u6578\u5316\u985e\u578b\u7684\u96c6\u5408\u662f\u5141\u8a31\u7684\u3002<\/p>\n<p>\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u662f\u6cdb\u578b\u985e\u578b\u7684\u5be6\u4f8b\u5316\uff0c\u5176\u4e2d\u81f3\u5c11\u4e00\u500b\u578b\u5225\u53c3\u6578\u662f\u901a\u914d\u7b26\u3002\u00a0 \u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u7684\u7bc4\u4f8b\u662f <tt> \u6536\u85cf&lt;?&gt;<\/tt> , <tt> \u5217\u51fa&lt;\uff1f\u64f4\u5145 Number&gt;<\/tt> , <tt> \u6bd4\u8f03\u5668&lt;\uff1f\u8d85\u7d1a\u5f26&gt;<\/tt> \u548c <tt> \u5c0d&lt;\u5b57\u4e32,?&gt;<\/tt> \u3002\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u8868\u793a\u5305\u542b\u6cdb\u578b\u985e\u578b\u7684\u7279\u5b9a\u5be6\u4f8b\u7684\u578b\u5225\u65cf\u3002\u00a0 \u6240\u4f7f\u7528\u7684\u901a\u914d\u7b26\u7684\u985e\u578b\u6c7a\u5b9a\u4e86\u54ea\u4e9b\u7279\u5b9a\u53c3\u6578\u5316\u985e\u578b\u5c6c\u65bc\u8a72\u65cf\u3002\u00a0 \u4f8b\u5982\uff0c\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b <tt> \u6536\u85cf&lt;?&gt;<\/tt> \u8868\u793a\u6240\u6709\u5be6\u4f8b\u5316\u7684\u5bb6\u65cf <tt> \u6536\u85cf<\/tt> \u63a5\u53e3\uff0c\u7121\u8ad6\u985e\u578b\u53c3\u6578\u5982\u4f55\u3002\u00a0 \u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b <tt> \u5217\u51fa&lt;\uff1f\u64f4\u5145 Number&gt;<\/tt> \u8868\u793a\u6240\u6709\u6e05\u55ae\u985e\u578b\u7684\u65cf\uff0c\u5176\u4e2d\u5143\u7d20\u985e\u578b\u662f\u4ee5\u4e0b\u985e\u578b\u7684\u5b50\u985e\u578b\u00a0 <tt> \u6578\u4f4d<\/tt> \u3002\u00a0 \u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b <tt> \u6bd4\u8f03\u5668&lt;\uff1f\u8d85\u7d1a\u5f26&gt;<\/tt> \u662f\u6240\u6709\u5be6\u4f8b\u5316\u7684\u5bb6\u65cf <tt> \u6bd4\u8f03\u5668<\/tt> \u4f5c\u70ba\u8d85\u985e\u578b\u7684\u985e\u578b\u53c3\u6578\u985e\u578b\u7684\u63a5\u53e3 <tt> \u7d30\u7e69\u3002<\/tt><\/p>\n<p><strong><em>\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u4e0d\u662f\u5e38\u898f\u610f\u7fa9\u4e0a\u7684\u985e\u578b\uff08\u4e0d\u540c\u65bc\u975e\u53c3\u6578\u5316\u985e\u5225\/\u4ecb\u9762\u6216\u539f\u59cb\u985e\u578b\uff09\u3002<\/em> <\/strong><\/p>\n<p>\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u53ef\u7528\u65bc\u9375\u5165\uff08\u5982\u975e\u53c3\u6578\u5316\u985e\u5225\u548c\u4ecb\u9762\uff09\uff1a<\/p>\n<ul>\n<li>\u4f5c\u70ba\u65b9\u6cd5\u7684\u53c3\u6578\u548c\u8fd4\u56de\u985e\u578b<\/li>\n<li>\u4f5c\u70ba\u6b04\u4f4d\u6216\u5c40\u90e8\u5f15\u7528\u8b8a\u6578\u7684\u985e\u578b<\/li>\n<li>\u4f5c\u70ba\u6578\u7d44\u7684\u7d44\u4ef6\u985e\u578b\u4f5c\u70ba\u5176\u4ed6\u53c3\u6578\u5316\u985e\u578b\u7684\u985e\u578b\u53c3\u6578<\/li>\n<li>\u4f5c\u70ba\u5f37\u5236\u8f49\u63db\u4e2d\u7684\u76ee\u6a19\u985e\u578b<\/li>\n<\/ul>\n<p>\u4e0d\u53ea\u985e\u578b\u53ef\u4ee5\u662f\u6cdb\u578b\u7684\uff0c\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u662f\u6cdb\u578b\u7684\u3002\u975c\u614b\u548c\u975e\u975c\u614b\u65b9\u6cd5\u4ee5\u53ca\u5efa\u69cb\u51fd\u6578\u53ef\u4ee5\u5177\u6709\u985e\u578b\u53c3\u6578\u3002\u5f62\u5f0f\u985e\u578b\u53c3\u6578\u8072\u660e\u7684\u8a9e\u6cd5\u8207\u6cdb\u578b\u985e\u578b\u7684\u8a9e\u6cd5\u985e\u4f3c\u3002\u985e\u578b\u53c3\u6578\u90e8\u5206\u7531\u5c16\u62ec\u865f\u5206\u9694\uff0c\u51fa\u73fe\u5728\u65b9\u6cd5\u7684\u56de\u50b3\u985e\u578b\u4e4b\u524d\u3002\u5176\u8a9e\u6cd5\u548c\u610f\u7fa9\u8207\u6cdb\u578b\u985e\u578b\u7684\u985e\u578b\u53c3\u6578\u6e05\u55ae\u76f8\u540c\u3002<\/p>\n<p>\u9019\u662f\u901a\u7528\u7684\u7bc4\u4f8b <tt> \u6700\u5927\u9650\u5ea6<\/tt> \u8a08\u7b97\u672a\u77e5\u985e\u578b\u5143\u7d20\u96c6\u5408\u4e2d\u6700\u5927\u503c\u7684\u65b9\u6cd5 <tt> \u4e00\u500b<\/tt> \u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u901a\u7528\u65b9\u6cd5\uff09\uff1a<\/p>\n<blockquote><p><tt> \u985e\u5225\u96c6\u5408{<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u975c\u614b <b> <span style=\"color:#000099;\"> &lt;A \u64f4\u5145\u4e86 Comparable&lt;A&gt;&gt; A<\/span> <\/b> \u6700\u5927(\u96c6\u5408&lt;<b> <span style=\"color:#000099;\"> \u4e00\u500b<\/span> <\/b> &gt; xs) {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u8fed\u4ee3\u5668&lt;<b> <span style=\"color:#000099;\"> \u4e00\u500b<\/span> <\/b> &gt; xi = xs.iterator();<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 <b> <span style=\"color:#000099;\"> \u4e00\u500b<\/span> <\/b> w = xi.next();<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 while (xi.hasNext()) {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#000099;\"> \u4e00\u500b<\/span> <\/b> x = xi.next();<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 if (w.compareTo(x) &lt; 0) w = x;<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u8fd4\u56dew\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }\u00a0<\/tt><\/p><\/blockquote>\n<p>\u9019 <tt> \u6700\u5927\u9650\u5ea6<\/tt> \u65b9\u6cd5\u6709\u4e00\u500b\u578b\u5225\u53c3\u6578\uff0c\u540d\u70ba<tt> \u4e00\u500b<\/tt> \u3002\u00a0 \u5b83\u662f\u8a72\u65b9\u6cd5\u6240\u8655\u7406\u7684\u96c6\u5408\u7684\u5143\u7d20\u985e\u578b\u7684\u4f54\u4f4d\u7b26\u3002\u985e\u578b\u53c3\u6578\u6709\u4e00\u500b\u754c\u9650\uff1b\u5b83\u5fc5\u9808\u662f\u4e00\u500b\u5b50\u985e\u578b\u7684\u985e\u578b <tt> \u53ef\u6bd4&lt;A&gt;<\/tt><\/p>\n<p>\u7bc4\u4f8b\uff08\u76f8\u540c\u7684\u6cdb\u578b\u985e\u578b\uff0c\u9019\u6b21 <i> \u548c<\/i> \u908a\u754c\uff09\uff1a<\/p>\n<blockquote><p><tt> \u516c\u5171\u4ecb\u9762 Comparable&lt;T&gt; {<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171 int CompareTo(T arg);<\/tt><br \/>\n<tt> }<\/tt><br \/>\n<tt> \u516c\u5171\u985e\u5225 TreeMap&lt;Key <b> <span style=\"color:#000066;\"> \u64f4\u5145 Comparable&lt;Key&gt;<\/span> <\/b> ,\u6578\u64da&gt;{<\/tt><br \/>\n<tt> \u00a0 \u79c1\u6709\u975c\u614b\u985e\u5225 Entry&lt;K,V&gt; {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 K\u9375\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 V\u503c\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Entry&lt;K,V&gt; \u5de6 = null;<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Entry&lt;K,V&gt; \u53f3 = null;<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 \u689d\u76ee&lt;K\uff0cV&gt;\u7236\u7d1a\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u79c1\u6709\u77ac\u614bEntry&lt;Key\uff0cData&gt; root = null\uff1b<\/tt><br \/>\n<tt> \u00a0 ...<\/tt><br \/>\n<tt> \u00a0 \u79c1\u6709 Entry&lt;Key,Data&gt; getEntry(Key key) {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Entry&lt;Key\uff0cData&gt; p = \u6839\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 \u5bc6\u9470 k = \u5bc6\u9470\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 while (p != null) {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int cmp = k\u3002<b> <span style=\"color:#990000;\"> \u6bd4\u8f03\uff08p.key\uff09<\/span> <\/b> ;\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5982\u679c\uff08cmp==0\uff09<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56dep\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5426\u5247\u5982\u679c\uff08cmp &lt; 0\uff09<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 p = p.\u5de6\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5225\u7684\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 p = p.\u53f3\uff1b\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de\u7a7a\u503c\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u5e03\u723e\u5305\u542bKey\uff08\u5bc6\u9470\u5bc6\u9470\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 \u56de\u50b3 getEntry(key) != null;<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 ...<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u985e\u578b\u53c3\u6578 <tt> \u9470\u5319<\/tt> \u6709\u754c\u9650 <tt> \u53ef\u6bd4\u8f03&lt;Key&gt;<\/tt> \u3002\u00a0 \u754c\u9650\u7684\u898f\u7bc4\u6709\u5169\u500b\u4f5c\u7528\uff1a<\/p>\n<ul>\n<li><i> \u5b83\u5141\u8a31\u5b58\u53d6\u7d81\u5b9a\u6307\u5b9a\u7684\u65b9\u6cd5<\/i> \u3002\u00a0 \u5728\u8a72\u7bc4\u4f8b\u4e2d\uff0c\u908a\u754c <tt> \u53ef\u6bd4\u8f03&lt;Key&gt; <\/tt> \u53ef\u4ee5\u8a2a\u554f <tt> \u6bd4\u8f03<\/tt> \u6211\u5011\u8981\u5728\u5be6\u4f5c\u4e2d\u547c\u53eb\u7684\u65b9\u6cd5 <tt> \u6a39\u72c0\u5716<\/tt> \u73ed\u7d1a\u3002<\/li>\n<\/ul>\n<ul>\n<li><i> \u53ea\u6709\u300c\u5728\u908a\u754c\u5167\u300d\u7684\u985e\u578b\u624d\u80fd\u7528\u65bc\u6cdb\u578b\u985e\u578b\u7684\u5be6\u4f8b\u5316\u3002<\/i> \u00a0 \u5728\u7bc4\u4f8b\u4e2d\uff0c\u53c3\u6578\u5316\u985e\u578b\u4f8b\u5982 <tt> TreeMap&lt;Number,String&gt;<\/tt> \u6703\u88ab\u62d2\u7d55\uff0c\u56e0\u70ba\u985e\u578b <tt> \u6578\u4f4d<\/tt> \u4e0d\u662f \u7684\u5b50\u985e\u578b <tt> \u53ef\u6bd4\u8f03&lt;\u6578\u91cf&gt;<\/tt> \u3002\u00a0 \u53c3\u6578\u5316\u985e\u578b\u5982 <tt> TreeMap&lt;String,String&gt;<\/tt> \u6703\u88ab\u63a5\u53d7\uff0c\u56e0\u70ba String \u985e\u578b\u5728\u7bc4\u570d\u5167\uff0c\u4e5f\u5c31\u662f String \u7684\u5b50\u985e\u578b <tt> \u53ef\u6bd4\u8f03&lt;\u5b57\u4e32&gt;<\/tt> .<\/li>\n<\/ul>\n<p>\u6240\u6709\u985e\u5225\u3001\u4ecb\u9762\u548c\u679a\u8209\u985e\u578b\u90fd\u53ef\u4ee5\u7528\u4f5c\u985e\u578b\u53c3\u6578\u7d81\u5b9a\uff0c\u5305\u62ec\u5de2\u72c0\u985e\u578b\u548c\u5167\u90e8\u985e\u578b\u3002\u00a0 \u57fa\u672c\u578b\u5225\u548c\u9663\u5217\u578b\u5225\u90fd\u4e0d\u80fd\u7528\u4f5c\u578b\u5225\u53c3\u6578\u7d81\u5b9a\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u985e\u578b\u53c3\u6578\u908a\u754c\uff09\uff1a<\/p>\n<blockquote><p><tt> X0 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u6574\u6578<\/span> <\/b> &gt; { ... }\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> X1 &lt;T \u985e\u5225\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u76ee\u7684[]<\/span> <\/b> &gt; { ... } <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> X2 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u6578\u4f4d<\/span> <\/b> &gt; { ... }<\/tt><br \/>\n<tt> X3 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u7d30\u7e69<\/span> <\/b> &gt; { ... }<\/tt><br \/>\n<tt> X4 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u53ef\u904b\u884c<\/span> <\/b> &gt; { ... }<\/tt><br \/>\n<tt> X5 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u7dda\u7a0b\u72c0\u614b<\/span> <\/b> &gt; { ... }<\/tt><br \/>\n<tt> X6 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u6e05\u55ae<\/span> <\/b> &gt; { ... }<\/tt><br \/>\n<tt> X7 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u5217\u8868&lt;\u5b57\u4e32&gt;<\/span> <\/b> &gt; { ... }<\/tt><br \/>\n<tt> X8 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u5217\u51fa&lt;\uff1f\u64f4\u5145 Number&gt;<\/span> <\/b> &gt; { ... }<\/tt><br \/>\n<tt> X9 &lt;T \u7d1a\u64f4\u5c55 <b> <span style=\"color:#000099;\"> \u53ef\u4ee5\u8207&lt;\u76f8\u5ab2\u7f8e\u55ce\uff1f\u8d85\u7d1a\u865f\u78bc&gt;<\/span> <\/b> &gt; { ... }<\/tt><br \/>\n<tt> X10&lt;T \u985e\u5225\u64f4\u5c55 <b> <span style=\"color:#000099;\"> Map.Entry&lt;?,?&gt;<\/span> <\/b> &gt; { ... }<\/tt><\/p><\/blockquote>\n<p>\u7a0b\u5f0f\u78bc\u7bc4\u4f8b\u986f\u793a\u4e86\u57fa\u672c\u985e\u578b\uff0c\u4f8b\u5982 <tt> \u6574\u6578<\/tt> \u548c\u6578\u7d44\u985e\u578b\uff0c\u4f8b\u5982 <tt> \u76ee\u7684[] <\/tt> \u4e0d\u5141\u8a31\u4f5c\u70ba\u985e\u578b\u53c3\u6578\u7d81\u5b9a\u3002<\/p>\n<p>\u985e\u5225\u985e\u578b\uff0c\u4f8b\u5982 <tt> \u6578\u4f4d<\/tt> \u6216\u8005 <tt> \u7d30\u7e69<\/tt> \uff0c\u4ee5\u53ca\u4ecb\u9762\u985e\u578b\uff0c\u4f8b\u5982 <tt> \u53ef\u904b\u884c<\/tt> \uff0c\u5141\u8a31\u4f5c\u70ba\u985e\u578b\u53c3\u6578\u7d81\u5b9a\u3002<\/p>\n<p>\u679a\u8209\u985e\u578b\uff0c\u4f8b\u5982 <tt> \u7dda\u7a0b\u72c0\u614b<\/tt> \u4e5f\u5141\u8a31\u4f5c\u70ba\u985e\u578b\u53c3\u6578\u7d81\u5b9a\u3002 <tt> \u7dda\u7a0b\u72c0\u614b<\/tt> \u662f\u7528\u4f5c\u985e\u578b\u53c3\u6578\u7d81\u5b9a\u7684\u5de2\u72c0\u985e\u578b\u7684\u7bc4\u4f8b\u3002\u00a0 \u975e\u975c\u614b\u5167\u90e8\u985e\u578b\u4e5f\u662f\u5141\u8a31\u7684\u3002<\/p>\n<p>\u5141\u8a31\u539f\u59cb\u985e\u578b\u4f5c\u70ba\u985e\u578b\u53c3\u6578\u7d81\u5b9a\uff1b <tt> <span style=\"color:#000000;\"> \u6e05\u55ae<\/span> <\/tt> \u5c31\u662f\u4e00\u500b\u4f8b\u5b50\u3002<\/p>\n<p>\u53c3\u6578\u5316\u985e\u578b\u5141\u8a31\u4f5c\u70ba\u985e\u578b\u53c3\u6578\u7d81\u5b9a\uff0c\u5305\u62ec\u7279\u5b9a\u7684\u53c3\u6578\u5316\u985e\u578b\uff0c\u4f8b\u5982 <tt> \u5217\u8868&lt;\u5b57\u4e32&gt;<\/tt> \uff0c\u6709\u754c\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\uff0c\u4f8b\u5982 <tt> \u5217\u51fa&lt;\uff1f\u64f4\u5145 Number&gt;<\/tt> \u548c <tt> \u53ef\u4ee5\u8207&lt;\u76f8\u5ab2\u7f8e\u55ce\uff1f\u8d85\u9577&gt;<\/tt> \uff0c\u4ee5\u53ca\u7121\u754c\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\uff0c\u4f8b\u5982 <tt> Map.Entry&lt;?,?&gt;<\/tt> \u3002\u00a0 \u4f5c\u70ba\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u7684\u908a\u754c\u5141\u8a31\u5c6c\u65bc\u901a\u914d\u7b26\u8868\u793a\u7684\u578b\u5225\u65cf\u7684\u6240\u6709\u578b\u5225\u4f5c\u70ba\u578b\u5225\u53c3\u6578\u3002\u00a0 \u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u7d81\u5b9a\u50c5\u63d0\u4f9b\u5c0d\u6b04\u4f4d\u548c\u65b9\u6cd5\u7684\u6709\u9650\u5b58\u53d6\uff1b\u9650\u5236\u53d6\u6c7a\u65bc\u901a\u914d\u7b26\u7684\u985e\u578b\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u4f5c\u70ba\u985e\u578b\u53c3\u6578\u7d81\u5b9a\uff09\uff1a<\/p>\n<blockquote><p><tt> X&lt; \u7d1a<b> <span style=\"color:#000099;\"> T \u64f4\u5145 List&lt;\uff1f\u64f4\u5145 Number&gt;<\/span> <\/b> &gt; {<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u7121\u6548\u4e00\u4e9b\u65b9\u6cd5\uff08T t\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 t.add(new Long(0L));\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u6578\u5b57 n = t.remove(0);<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }<\/tt><br \/>\n<tt> \u985e\u5225\u6e2c\u8a66{<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u975c\u614b\u7121\u6548\u4e3b\uff08\u5b57\u4e32[] args\uff09{<\/tt><br \/>\n<tt> <b> <span style=\"color:#660000;\"> \u00a0\u00a0\u00a0\u00a0 <\/span> <\/b> <span style=\"color:#000000;\"> X&lt;ArrayList&lt;<\/span> <b> <span style=\"color:#000099;\"> \u9577\u7684<\/span> <\/b> <span style=\"color:#000000;\"> &gt;&gt; x1 = \u65b0 X&lt;ArrayList&lt;Long&gt;&gt;();\u00a0<\/span> <\/tt><br \/>\n<tt> <span style=\"color:#000000;\"> \u00a0\u00a0\u00a0\u00a0 X&lt;ArrayList&lt;<\/span> <b> <span style=\"color:#000099;\"> \u7d30\u7e69<\/span> <\/b> <span style=\"color:#000000;\"> &gt;&gt; x2 = \u65b0 X&lt;ArrayList&lt;String&gt;&gt;(); <\/span> <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u985e\u578b\u7684\u5f15\u7528\u8b8a\u6578<tt> \u6642\u9593 <\/tt> \uff08\u578b\u5225\u53c3\u6578\uff09\u88ab\u8996\u70ba\u901a\u914d\u7b26\u985e\u578b\uff08\u578b\u5225\u53c3\u6578\u7d81\u5b9a\uff09\u7684\u53c3\u8003\u8b8a\u6578\u3002\u00a0 \u5728\u6211\u5011\u7684\u7bc4\u4f8b\u4e2d\uff0c\u7d50\u679c\u662f\u7de8\u8b6f\u5668\u62d2\u7d55\u547c\u53eb\u63a1\u7528\u578b\u5225\u53c3\u6578\u6240\u4ee3\u8868\u7684\u300c\u672a\u77e5\u300d\u985e\u578b\u7684\u53c3\u6578\u7684\u65b9\u6cd5\uff0c\u4f8b\u5982 <tt> \u5217\u8868.\u65b0\u589e<\/tt> \uff0c\u56e0\u70ba\u754c\u9650\u662f\u5177\u6709\u4e0a\u9650\u7684\u901a\u914d\u7b26\u53c3\u6578\u5316\u985e\u578b\u3002<br \/>\n\u540c\u6642\u7d81\u5b9a <tt> \u5217\u51fa&lt;\uff1f\u64f4\u5145 Number&gt;<\/tt> \u78ba\u5b9a\u53ef\u7528\u4f5c\u578b\u5225\u53c3\u6578\u7684\u578b\u5225\u3002\u7de8\u8b6f\u5668\u63a5\u53d7\u5c6c\u65bc\u8a72\u985e\u578b\u65cf\u7684\u6240\u6709\u578b\u5225\u53c3\u6578 <tt> \u5217\u51fa&lt;\uff1f\u64f4\u5145 Number&gt;<\/tt> \uff0c\u5373\u6240\u6709\u5b50\u985e\u578b <tt> \u6e05\u55ae<\/tt> \u5e36\u6709\u4e00\u500b\u5b50\u985e\u578b\u7684\u985e\u578b\u53c3\u6578 <tt> \u6578\u4f4d<\/tt> \u3002<\/p>\n<p>\u4e00\u500b\u985e\u578b\u53c3\u6578\u53ef\u4ee5\u7528\u4f5c\u53e6\u4e00\u500b\u985e\u578b\u53c3\u6578\u7684\u908a\u754c\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u7528\u4f5c\u985e\u578b\u53c3\u6578\u7d81\u5b9a\u7684\u985e\u578b\u53c3\u6578\uff09\uff1a<\/p>\n<blockquote><p><tt> \u4e09\u4eba\u8259<b> &lt;T&gt;<\/b> {<\/tt><br \/>\n<tt> \u00a0 \u79c1\u6709 T fst\u3001snd\u3001trd\uff1b<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171&lt;<b> U<\/b> <b> <span style=\"color:#000099;\"> \u5ef6\u4f38 T<\/span> <\/b> , <b> V <span style=\"color:#000099;\"> \u5ef6\u4f38 T<\/span> <\/b> , <b> \u74e6 <span style=\"color:#000099;\"> \u5ef6\u4f38 T<\/span> <\/b> &gt; \u4e09\u91cd\uff08U arg1\uff0cV arg2\uff0cW arg3\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 fst = arg1\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 snd = arg2;<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 trd = arg3;<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u5728\u6b64\u7bc4\u4f8b\u4e2d\uff0c\u985e\u578b\u53c3\u6578 <tt> \u6642\u9593<\/tt> \u53c3\u6578\u5316\u985e\u5225\u7684\u503c\u7528\u4f5c\u578b\u5225\u53c3\u6578\u7684\u7d81\u5b9a <tt> U<\/tt> ,\u00a0 <tt> V<\/tt> \u548c <tt> \u74e6<\/tt> \u8a72\u985e\u5225\u7684\u53c3\u6578\u5316\u5be6\u4f8b\u65b9\u6cd5\u3002<\/p>\n<p>\u4f7f\u7528\u985e\u578b\u53c3\u6578\u4f5c\u70ba\u5176\u4ed6\u985e\u578b\u53c3\u6578\u7684\u908a\u754c\u7684\u66f4\u591a\u6a5f\u6703\u5305\u62ec\u5728\u6cdb\u578b\u985e\u578b\u5167\u5b9a\u7fa9\u5d4c\u5957\u985e\u578b\u6216\u5728\u6cdb\u578b\u65b9\u6cd5\u5167\u5b9a\u7fa9\u5c40\u90e8\u985e\u5225\u7684\u60c5\u6cc1\u3002\u00a0 \u751a\u81f3\u5141\u8a31\u4f7f\u7528\u4e00\u500b\u578b\u5225\u53c3\u6578\u4f5c\u70ba\u540c\u4e00\u578b\u5225\u53c3\u6578\u90e8\u5206\u4e2d\u53e6\u4e00\u500b\u578b\u5225\u53c3\u6578\u7684\u7d81\u5b9a\u3002<\/p>\n<p>\u4f5c\u70ba\u985e\u5225\u7684\u908a\u754c\u5141\u8a31\u5b58\u53d6\u5176\u6240\u6709\u516c\u5171\u6210\u54e1\uff0c\u5373\u516c\u5171\u6b04\u4f4d\u3001\u65b9\u6cd5\u548c\u5de2\u72c0\u985e\u578b\u3002\u53ea\u6709\u5efa\u69cb\u5b50\u4e0d\u53ef\u8a2a\u554f\uff0c\u56e0\u70ba\u4e0d\u80fd\u4fdd\u8b49\u7d81\u5b9a\u7684\u5b50\u985e\u5225\u5177\u6709\u8207\u7d81\u5b9a\u76f8\u540c\u7684\u5efa\u69cb\u5b50\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u7528\u4f5c\u985e\u578b\u53c3\u6578\u7d81\u5b9a\u7684\u985e\u5225\uff09\uff1a<\/p>\n<blockquote><p><tt> \u516c\u958b\u8ab2 <span style=\"color:#000000;\"> \u8d85\u7d1a\u73ed<\/span> {<\/tt><tt> \u00a0\u00a0\u00a0 \/\/ \u975c\u614b\u6210\u54e1<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u679a\u8209 EnumType {\u9019\u500b\uff0c\u90a3\u500b}<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u975c\u614b\u7269\u4ef6\u975c\u614b\u5b57\u6bb5\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u975c\u614b\u7121\u6548\u975c\u614b\u65b9\u6cd5\uff08\uff09{...}<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0 \/\/ \u975e\u975c\u614b\u6210\u54e1<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u985e\u5225\u5167\u90e8\u985e\u5225 { ... }<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u7269\u4ef6\u975e\u975c\u614b\u5b57\u6bb5\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u7121\u6548\u975e\u975c\u614b\u65b9\u6cd5\uff08\uff09{...}<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0 \/\/ \u5efa\u69cb\u51fd\u5f0f<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u8d85\u985e\u5225\uff08\uff09{...}<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0 \/\/ \u79c1\u6709\u6210\u54e1<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u79c1\u6709\u5c0d\u8c61\u79c1\u6709\u6b04\u4f4d\uff1b\u00a0<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0 ...<\/tt><br \/>\n<tt> }<\/tt><\/p>\n<p><tt> \u516c\u5171\u6700\u7d42\u985e SomeClass&lt;T \u64f4\u5c55 <b> <span style=\"color:#006600;\"> \u8d85\u7d1a\u73ed<\/span> <\/b> &gt; {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u79c1\u6709T\u5c0d\u8c61\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171 SomeClass(T t) { \u7269\u4ef6 = t; }\u00a0<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0 \u516c\u6709\u5b57\u4e32 toString() {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \"\u975c\u614b\u5de2\u72c0\u578b\u5225\u00a0\u00a0\u00a0 : \"+T.EnumType.class+\"\\n\"\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 +\"\u975c\u614b\u5b57\u6bb5\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : \"+T.staticField+\"\\n\"<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 +\"\u975c\u614b\u65b9\u6cd5\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : \"+T.staticMethod()+\"\\n\"<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 +\u201c\u975e\u975c\u614b\u5de2\u72c0\u578b\u5225\uff1a\u201d+T.InnerClass.class+\u201d\\n\u201d<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 +\"\u975e\u975c\u614b\u5b57\u6bb5\u00a0\u00a0\u00a0\u00a0\u00a0 : \"+object.nonStaticField+\"\\n\"<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 +\"\u975e\u975c\u614b\u65b9\u6cd5\u00a0\u00a0\u00a0\u00a0 : \"+object.nonStaticMethod()+\"\\n\"<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 +\"\u5efa\u69cb\u5b50\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : \"+(new T())+\"\\n\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/\u932f\u8aa4<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 +\"\u79c1\u6709\u6210\u54e1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 : \"+object.privateField+\"\\n\"\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/ \u932f\u8aa4\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ;<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u754c\u7dda <tt> \u8d85\u7d1a\u73ed<\/tt> \u63d0\u4f9b\u5c0d\u5176\u5de2\u72c0\u985e\u578b\u3001\u975c\u614b\u6b04\u4f4d\u548c\u65b9\u6cd5\u4ee5\u53ca\u975e\u975c\u614b\u6b04\u4f4d\u548c\u65b9\u6cd5\u7684\u5b58\u53d6\u3002\u00a0 \u53ea\u6709\u5efa\u69cb\u51fd\u6578\u4e0d\u53ef\u5b58\u53d6\u3002\u00a0 \u9019\u662f\u56e0\u70ba\u5efa\u69cb\u5b50\u4e0d\u662f\u7e7c\u627f\u7684\u3002\u6bcf\u500b\u5b50\u985e\u5225\u90fd\u5b9a\u7fa9\u81ea\u5df1\u7684\u5efa\u69cb\u51fd\u6578\uff0c\u4e26\u4e14\u4e0d\u9700\u8981\u652f\u63f4\u5176\u8d85\u985e\u5225\u7684\u5efa\u69cb\u51fd\u6578\u3002\u00a0 \u56e0\u6b64\u4e0d\u80fd\u4fdd\u8b49\u5b50\u985e\u5225 <tt> \u8d85\u7d1a\u73ed<\/tt> \u5c07\u5177\u6709\u8207\u5176\u8d85\u985e\u5225\u76f8\u540c\u7684\u5efa\u69cb\u51fd\u6578\u3002<\/p>\n<p>\u6240\u8655\u7684\u80cc\u666f<tt> Enum&lt;E \u64f4\u5c55\u4e86 Enum&lt;E&gt;&gt;<\/tt> \u201d \u51fa\u73fe\u7684\u662f\u8072\u660e <tt> \u5217\u8209<\/tt> \u5305\u4e2d\u7684\u985e <tt> java\u8a9e\u8a00<\/tt> :<\/p>\n<blockquote><p><tt> \u516c\u5171\u62bd\u8c61\u985e\u5225 <b> Enum&lt;E \u64f4\u5c55\u4e86 Enum&lt;E&gt;&gt;<\/b> {<\/tt><br \/>\n<tt> \u00a0 ...<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u985e\u578b <tt> \u5217\u8209<\/tt> \u662f\u6240\u6709\u679a\u8209\u985e\u578b\u7684\u516c\u5171\u57fa\u985e\u3002\u00a0 \u5728 Java \u4e2d\uff0c\u679a\u8209\u578b\u5225\u4f8b\u5982 <tt> \u984f\u8272<\/tt> \u88ab\u7ffb\u8b6f\u6210\u4e00\u500b\u985e\u5225 <tt> \u984f\u8272<\/tt> \u5ef6\u4f38 <tt> \u679a\u8209&lt;\u984f\u8272&gt;<\/tt> \u3002\u8d85\u985e\u7684\u76ee\u7684 <tt> \u5217\u8209<\/tt> \u662f\u63d0\u4f9b\u6240\u6709\u679a\u8209\u985e\u578b\u901a\u7528\u7684\u529f\u80fd\u3002<\/p>\n<p>\u9019\u662f\u73ed\u7d1a\u8349\u5716 <tt> \u5217\u8209<\/tt> :<\/p>\n<blockquote><p><tt> \u516c\u5171\u62bd\u8c61\u985e\u5225 <b> \u679a\u4e3e&lt;<span style=\"color:#000099;\"> \u4e59<\/span> \u6269\u5c55 Enum&lt;E&gt;&gt;<\/b> \u5b9e\u73b0 Comparable&lt;<b> <span style=\"color:#000099;\"> \u4e59<\/span> <\/b> &gt;\uff0c\u53ef\u5e8f\u5217\u5316 {<\/tt><br \/>\n<tt> \u00a0 \u79c1\u6709\u6700\u7d42\u5b57\u4e32\u540d\u7a31\uff1b<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u6700\u7d42\u5b57\u4e32\u540d\u7a31\uff08\uff09{...}<\/tt><tt> \u00a0 \u79c1\u4eba\u6700\u7d42 int \u5e8f\u6578\uff1b<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u6700\u7d42 int ordinal() { ... }<\/tt><\/p>\n<p><tt> \u00a0 protected Enum(String name, int ordinal) { ... }<\/tt><\/p>\n<p><tt> \u00a0 \u516c\u6709\u5b57\u4e32\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 toString() { ... }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u6700\u7d42\u5e03\u6797\u503c\u7b49\u65bc\uff08\u7269\u4ef6\u5176\u4ed6\uff09{...}<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u6700\u7d42 int hashCode() { ... }<\/tt><br \/>\n<tt> \u00a0 protected Final Object clone() \u62cb\u51fa CloneNotSupportedException { ... }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u6700\u7d42 int \u6bd4\u8f03\uff08<b> <span style=\"color:#000099;\"> \u4e59<\/span> <\/b> o) { ... }<\/tt><\/p>\n<p><tt> \u00a0 \u516c\u5171\u6700\u7d42\u985e&lt;<b> <span style=\"color:#000099;\"> \u4e59<\/span> <\/b> &gt; getDeclaringClass() { ... }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u975c\u614b &lt;T \u64f4\u5145 Enum&lt;T&gt;&gt; T valueOf(Class&lt;T&gt; enumType, \u5b57\u4e32\u540d\u7a31) { ... }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u5ba3\u8a00\u4e2d\u4ee4\u4eba\u60ca\u8bb6\u7684\u7279\u70b9\u201c<tt> Enum&lt;E \u64f4\u5c55\u4e86 Enum&lt;E&gt;&gt;<\/tt> \u201c\u4e8b\u5b9e\u662f\u65b0\u5b9a\u4e49\u7684\u7c7b <tt> \u5217\u8209<\/tt> \u53ca\u5176\u65b0\u5b9a\u4e49\u7684\u7c7b\u578b\u53c2\u6570 <tt> \u4e59 <\/tt> \u51fa\u73b0\u5728\u540c\u4e00\u7c7b\u578b\u53c2\u6570\u7684\u8fb9\u754c\u4e2d\u3002\u00a0 \u8fd9\u610f\u5473\u7740 <tt> \u5217\u8209<\/tt> \u7c7b\u578b\u5fc5\u987b\u4e3a\u5176\u5b50\u7c7b\u578b\u4e4b\u4e00\u5b9e\u4f8b\u5316\u3002\u00a0 \u4e3a\u4e86\u7406\u89e3\u4e3a\u4ec0\u4e48\u8fd9\u662f\u6709\u610f\u4e49\u7684\uff0c\u8bf7\u8003\u8651\u6bcf\u4e2a\u679a\u4e3e\u7c7b\u578b\u90fd\u88ab\u8f6c\u6362\u4e3a <tt> \u5217\u8209<\/tt> \u3002<\/p>\n<p>\u8fd9\u662f\u4eba\u4e3a\u7684\u679a\u4e3e\u7c7b\u578b <tt> \u984f\u8272<\/tt> :<\/p>\n<blockquote><p><tt> \u679a\u4e3e <b> \u984f\u8272<\/b> {\u7ea2\u3001\u84dd\u3001\u7eff}<\/tt><\/p><\/blockquote>\n<p>\u7f16\u8bd1\u5668\u5c06\u5176\u7ffb\u8bd1\u4e3a\u4ee5\u4e0b\u7c7b\uff1a<\/p>\n<blockquote><p><tt> \u516c\u5f00\u671f\u672b\u73ed <b> \u984f\u8272<\/b> \u5ef6\u4f38 <b> \u679a\u8209&lt;\u984f\u8272&gt;<\/b> {<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u975c\u614b\u6700\u7d42\u984f\u8272[]\u503c\uff08\uff09{\u8fd4\u56de\uff08\u984f\u8272[]\uff09$VALUES.clone\uff08\uff09; }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u975c\u614b\u984f\u8272\u503c\uff08\u5b57\u4e32\u540d\u7a31\uff09{...}<\/tt><tt> \u00a0 \u79c1\u6709\u984f\u8272\uff08\u5b57\u4e32 s\uff0cint i\uff09{ \u8d85\u7d1a\uff08s\uff0ci\uff09; }<\/tt><\/p>\n<p><tt> \u00a0 \u516c\u5171\u975c\u614b\u6700\u7d42\u984f\u8272\u7d05\u8272\uff1b<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u975c\u614b\u6700\u7d42\u984f\u8272\u85cd\u8272\uff1b<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u975c\u614b\u6700\u7d42\u984f\u8272\u7da0\u8272\uff1b<\/tt><\/p>\n<p><tt> \u00a0 \u79c1\u4eba\u975c\u614b\u6700\u7d42\u984f\u8272$VALUES[];<\/tt><\/p>\n<p><tt> \u00a0 \u975c\u6b62\u7684 {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u7d05\u8272=\u65b0\u984f\u8272\uff08\u201c\u7d05\u8272\u201d\uff0c0\uff09\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u85cd\u8272 = \u65b0\u984f\u8272(\"\u85cd\u8272\", 1);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u7da0\u8272 = \u65b0\u984f\u8272(\"\u7da0\u8272\", 2);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 $VALUES = (\u65b0\u984f\u8272[] { \u7d05\u3001\u85cd\u3001\u7da0 });<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u7e7c\u627f\u7684\u6548\u679c\u662f <tt> \u984f\u8272<\/tt> \u985e\u578b\u7e7c\u627f\u4e86\u6240\u6709\u5be6\u4f5c\u7684\u65b9\u6cd5 <tt> \u679a\u8209&lt;\u984f\u8272&gt;<\/tt> \u3002\u00a0 \u5176\u4e2d\u6709 <tt> \u6bd4\u8f03<\/tt> \u65b9\u6cd5\u3002\u00a0 \u9019 <tt> \u984f\u8272\u3002\u6bd4\u8f03<\/tt> \u65b9\u6cd5\u53ef\u80fd\u61c9\u8a72\u63a1\u53d6 <tt> \u984f\u8272<\/tt> \u4f5c\u70ba\u4e00\u500b\u8ad6\u9ede\u3002\u00a0 \u70ba\u4e86\u5be6\u73fe\u9019\u4e00\u9ede\uff0c\u73ed\u7d1a <tt> \u5217\u8209<\/tt> \u662f\u901a\u7528\u7684\uff0c\u4e26\u4e14 <tt> \u679a\u8209compareTo<\/tt> \u65b9\u6cd5\u9700\u8981 <tt> \u5217\u8209<\/tt> \u7684\u578b\u5225\u53c3\u6578 <tt> \u4e59 <\/tt> \u4f5c\u70ba\u4e00\u500b\u8ad6\u9ede\u3002\u00a0 \u7d50\u679c\uff0c\u8f38\u5165 <tt> \u984f\u8272<\/tt> \u6e90\u81ea <tt> \u679a\u8209&lt;\u984f\u8272&gt;<\/tt> \u7e7c\u627f\u4e86\u4e00\u500b <tt> \u6bd4\u8f03<\/tt> \u65b9\u6cd5\u9700\u8981\u4e00\u500b <tt> \u984f\u8272<\/tt> as \u548c argument\uff0c\u6b63\u5982\u5b83\u61c9\u8a72\u7684\u90a3\u6a23\u3002<br \/>\n\u5982\u679c\u6211\u5011\u5256\u6790\u8072\u660e\u201c<tt> Enum&lt;E \u64f4\u5c55\u4e86 Enum&lt;E&gt;&gt;<\/tt> \u300c\u6211\u5011\u53ef\u4ee5\u770b\u5230\u9019\u500b\u6a21\u5f0f\u6709\u5e7e\u500b\u9762\u5411\u3002<\/p>\n<p>\u9996\u5148\uff0c\u4e8b\u5be6\u662f\u985e\u578b\u53c3\u6578\u7d81\u5b9a\u662f\u985e\u578b\u672c\u8eab\uff1a\u201c<tt> <b> \u5217\u8209<\/b> &lt;E \u5ef6\u9577 <b> \u5217\u8209<\/b> &lt;E&gt;&gt;<\/tt> \u300c\u3002\u5b83\u78ba\u4fdd\u53ea\u6709\u985e\u578b\u7684\u5b50\u985e\u578b <tt> \u5217\u8209<\/tt> \u5141\u8a31\u4f5c\u70ba\u985e\u578b\u53c3\u6578\u3002 \uff08\u7406\u8ad6\u4e0a\uff0c\u8f38\u5165 <tt> \u5217\u8209<\/tt> \u53ef\u4ee5\u5be6\u4f8b\u5316\u81ea\u8eab\uff0c\u5c31\u50cf <tt> \u679a\u8209&lt;Enum&gt;<\/tt> \uff0c\u4f46\u9019\u80af\u5b9a\u4e0d\u662f\u6709\u610f\u7684\uff0c\u800c\u4e14\u5f88\u96e3\u60f3\u50cf\u9019\u6a23\u7684\u5be6\u4f8b\u5316\u6703\u6709\u7528\u7684\u60c5\u6cc1\u3002 \uff09<\/p>\n<p>\u5176\u6b21\uff0c\u53c3\u6578\u7d81\u5b9a\u985e\u578b\u662f\u53c3\u6578\u5316\u985e\u578b <tt> \u5217\u8209<b> &lt;E&gt;<\/b> <\/tt> \uff0c\u5b83\u4f7f\u7528\u985e\u578b\u53c3\u6578 <tt> \u4e59<\/tt> \u4f5c\u70ba\u908a\u754c\u7684\u985e\u578b\u53c3\u6578\u3002\u6b64\u8072\u660e\u78ba\u4fdd\u4e86\u5b50\u985e\u578b\u548c\u5be6\u4f8b\u5316\u4e4b\u9593\u7684\u7e7c\u627f\u95dc\u4fc2 <tt> \u5217\u8209<\/tt> \u662f\u9019\u6a23\u7684\u5f62\u5f0f<tt> X \u64f4\u5145\u4e86 Enum&lt;X&gt;<\/tt> \u300d\u3002\u8af8\u5982\u300c\u7684\u5b50\u985e\u578b<tt> X \u64f4\u5145\u4e86 Enum&lt;Y&gt;<\/tt> &#8221; \u7531\u65bc\u578b\u5225\u53c3\u6578\u800c\u7121\u6cd5\u8072\u660e <tt> \u662f<\/tt> \u4e0d\u6703\u5728\u754c\u9650\u5167\uff1b\u50c5\u5b50\u985e\u578b <tt> \u679a\u8209&lt;X&gt;<\/tt> \u90fd\u5728\u754c\u7dda\u4e4b\u5167\u3002<\/p>\n<p>\u7b2c\u4e09\uff0c\u6709\u4e00\u500b\u4e8b\u5be6\u662f <tt> \u5217\u8209<\/tt> \u9996\u5148\u662f\u901a\u7528\u7684\u3002\u00a0 \u9019\u610f\u5473\u8457\u985e\u5225\u7684\u4e00\u4e9b\u65b9\u6cd5 <tt> \u5217\u8209<\/tt> \u63a5\u53d7\u4e00\u500b\u53c3\u6578\u6216\u50b3\u56de\u672a\u77e5\u985e\u578b\u7684\u503c\uff08\u6216\u4f9d\u8cf4\u672a\u77e5\u985e\u578b\uff09\u3002\u6211\u5011\u5df2\u7d93\u77e5\u9053\uff0c\u9019\u7a2e\u672a\u77e5\u985e\u578b\u7a0d\u5f8c\u5c07\u6210\u70ba\u4e00\u500b\u5b50\u985e\u578b <tt> X<\/tt> \u7684 <tt> \u679a\u8209&lt;X&gt;<\/tt> \u3002\u00a0 \u56e0\u6b64\uff0c\u5728\u53c3\u6578\u5316\u985e\u578b\u4e2d <tt> \u679a\u8209&lt;X&gt;<\/tt> \uff0c\u9019\u4e9b\u65b9\u6cd5\u6d89\u53ca\u5b50\u985e\u578b <tt> X<\/tt> \uff0c\u4e26\u4e14\u5b83\u5011\u88ab\u7e7c\u627f\u5230\u5b50\u985e\u578b\u4e2d <tt> X<\/tt> \u3002\u00a0 \u9019 <tt> \u6bd4\u8f03<\/tt> \u65b9\u6cd5\u662f\u9019\u7a2e\u65b9\u6cd5\u7684\u4e00\u500b\u4f8b\u5b50\uff1b\u5b83\u5f9e\u8d85\u985e\u7e7c\u627f\u5230\u6bcf\u500b\u5b50\u985e\uff0c\u4e26\u4e14\u5728\u6bcf\u7a2e\u60c5\u6cc1\u4e0b\u90fd\u6709\u4e00\u500b\u5b50\u985e\u7279\u5b9a\u7684\u7c3d\u540d\u3002<\/p>\n<p>\u7e3d\u800c\u8a00\u4e4b\uff0c\u8072\u660e\u201c<tt> Enum&lt;E \u64f4\u5c55\u4e86 Enum&lt;E&gt;&gt;<\/tt> \u201d \u53ef\u4ee5\u89e3\u8b80\u70ba\uff1a <tt> \u5217\u8209<\/tt> \u662f\u4e00\u500b\u6cdb\u578b\u985e\u578b\uff0c\u53ea\u80fd\u70ba\u5176\u5b50\u985e\u578b\u5be6\u4f8b\u5316\uff0c\u4e26\u4e14\u9019\u4e9b\u5b50\u985e\u578b\u5c07\u7e7c\u627f\u4e00\u4e9b\u6709\u7528\u7684\u65b9\u6cd5\uff0c\u5176\u4e2d\u4e00\u4e9b\u65b9\u6cd5\u63a1\u7528\u5b50\u985e\u578b\u7279\u5b9a\u7684\u53c3\u6578\uff08\u6216\u4ee5\u5176\u4ed6\u65b9\u5f0f\u4f9d\u8cf4\u5b50\u985e\u578b\uff09\u3002<\/p>\n<p><b>\u985e\u5225\u7684\u4e0b\u754c\u985e\u578b\u53c3\u6578<\/b><\/p>\n<p>\u985e\u578b\u53c3\u6578\u53ef\u4ee5\u6709\u591a\u500b\u908a\u754c\uff0c\u4f8b\u5982 <tt> \u985e\u5225 Box&lt;T \u64f4\u5145 Number&gt; {...}<\/tt> \u3002\u4f46\u985e\u578b\u53c3\u6578\u4e0d\u80fd\u6709\u4e0b\u9650\uff0c\u5373\u8af8\u5982\u6b64\u985e\u7684\u69cb\u9020 <tt> \u985e Box&lt;T <b> \u5049\u5927\u7684<\/b> \u7de8\u865f&gt; {...}<\/tt> \u662f\u4e0d\u5141\u8a31\u7684\u3002\u00a0 \u70ba\u4ec0\u9ebc\u4e0d\u5462\uff1f\u00a0 \u7b54\u6848\u662f\uff1a\u9019\u662f\u6beb\u7121\u610f\u7fa9\u7684\uff0c\u56e0\u70ba\u5982\u679c\u5141\u8a31\u7684\u8a71\uff0c\u5b83\u4e0d\u6703\u7d66\u4f60\u8cb7\u4efb\u4f55\u6771\u897f\u3002\u00a0 \u8b93\u6211\u5011\u900f\u904e\u63a2\u7d22\u985e\u578b\u53c3\u6578\u7684\u4e0a\u9650\u610f\u5473\u8457\u4ec0\u9ebc\u4f86\u770b\u770b\u70ba\u4ec0\u9ebc\u985e\u5225\u7684\u4e0b\u9650\u985e\u578b\u53c3\u6578\u6703\u4ee4\u4eba\u56f0\u60d1\u3002<\/p>\n<p>\u985e\u578b\u53c3\u6578\u7684\u4e0a\u9650\u6709\u4e09\u500b\u4f5c\u7528\uff1a<\/p>\n<ol>\n<ol>\n<li><b> <i> \u53d7\u9650\u5be6\u4f8b\u5316\u3002<\/i> <\/b> \u4e0a\u9650\u9650\u5236\u53ef\u7528\u65bc\u6cdb\u578b\u985e\u578b\u5be6\u4f8b\u5316\u7684\u985e\u578b\u96c6\u3002\u00a0 \u5982\u679c\u6211\u5011\u8072\u660e\u4e00\u500b <tt> \u985e\u5225 Box&lt;T \u64f4\u5145 Number&gt; {...} <\/tt> \u90a3\u9ebc\u7de8\u8b6f\u5668\u5c07\u78ba\u4fdd\u53ea\u6709\u5b50\u985e\u578b <tt> \u6578\u4f4d<\/tt> \u53ef\u4ee5\u7528\u4f5c\u985e\u578b\u53c3\u6578\u3002\u00a0 \u4e5f\u5c31\u662f\u8aaa\uff0c\u4e00\u500b <tt> \u76d2\u5b50&lt;\u6578\u91cf&gt;<\/tt> \u6216\u4e00\u500b <tt> \u6846&lt;\u9577&gt;<\/tt> \u662f\u5141\u8a31\u7684\uff0c\u4f46\u662f <tt> \u76d2\u5b50&lt;\u7269\u4ef6&gt;<\/tt> \u6216\u8005 <tt> \u76d2\u5b50&lt;\u5b57\u4e32&gt;<\/tt> \u6703\u88ab\u62d2\u7d55<\/li>\n<\/ol>\n<\/ol>\n<p>\u7bc4\u4f8b\uff08\u7531\u65bc\u985e\u578b\u53c3\u6578\u7684\u4e0a\u9650\u800c\u9650\u5236\u5be6\u4f8b\u5316\uff09\uff1a<br \/>\n<tt> \u985e\u5225 Box&lt;T \u64f4\u5145 Number&gt; {\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u6709T\u503c\uff1b\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u6846(T t) { \u503c = t; }\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> }\u00a0<\/tt><tt> \u985e\u5225\u6e2c\u8a66{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u975c\u614b\u7121\u6548\u4e3b\uff08\u5b57\u4e32[] args\uff09{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Box&lt;Long&gt; boxOfLong = \u65b0 Box&lt;Long&gt;(0L);\u00a0\u00a0 <b> \/\/ \u7f8e\u597d\u7684<\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Box&lt;String&gt; boxOfString = new Box&lt;String&gt;(\"\"); <b> <span style=\"color:#330000;\"> \/\/ \u932f\u8aa4\uff1a\u5b57\u4e32\u4e0d\u5728\u7bc4\u570d\u5167<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p>\n<ol>\n<li><b> <i> \u5b58\u53d6\u975e\u975c\u614b\u6210\u54e1\u3002 <\/i> <\/b> \u4e0a\u9650\u5141\u8a31\u5b58\u53d6\u4e0a\u9650\u7684\u6240\u6709\u516c\u5171\u975e\u975c\u614b\u65b9\u6cd5\u548c\u6b04\u4f4d\u3002\u00a0 \u5728\u5be6\u65bd\u6211\u5011\u7684 <tt> \u985e\u5225 Box&lt;T \u64f4\u5145 Number&gt; {...}<\/tt> \u6211\u5011\u53ef\u4ee5\u547c\u53eb\u985e\u5225\u4e2d\u5b9a\u7fa9\u7684\u6240\u6709\u516c\u5171\u975e\u975c\u614b\u65b9\u6cd5 <tt> \u6578\u4f4d<\/tt> \uff0c \u4f8b\u5982 <tt> intValue()<\/tt> \u4f8b\u5982\u3002\u00a0 \u5982\u679c\u6c92\u6709\u4e0a\u9650\uff0c\u7de8\u8b6f\u5668\u5c07\u62d2\u7d55\u4efb\u4f55\u6b64\u985e\u547c\u53eb\u3002\u7bc4\u4f8b\uff08\u7531\u65bc\u985e\u578b\u53c3\u6578\u7684\u4e0a\u9650\u800c\u5b58\u53d6\u975e\u975c\u614b\u6210\u54e1\uff09\uff1a<\/li>\n<\/ol>\n<p><tt> \u985e\u5225 Box&lt;T \u64f4\u5145 Number&gt; {\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u6709T\u503c\uff1b\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u6846(T t) { \u503c = t; }\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171 int \u589e\u91cf() { \u50b3\u56de\u503c.intValue()+1; } <b> \/\/ \u5982\u679c\u6c92\u6709 Number \u9650\u5236\uff0c&lt;= \u5c07\u6703\u51fa\u932f<\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> }\u00a0<\/tt><\/p>\n<ol>\n<ol>\n<li><b> <i> \u985e\u578b\u64e6\u9664\u3002 <\/i> <\/b> \u6700\u5de6\u908a\u7684\u4e0a\u9650\u7528\u65bc\u985e\u578b\u64e6\u9664\u4e26\u66ff\u63db\u5b57\u7bc0\u78bc\u4e2d\u7684\u985e\u578b\u53c3\u6578\u3002\u00a0 \u5728\u6211\u5011\u7684 <tt> \u985e\u5225 Box&lt;T \u64f4\u5145 Number&gt; {...}<\/tt> \u6240\u6709\u51fa\u73fe\u7684 <tt> \u6642\u9593<\/tt> \u5c07\u88ab\u4e0a\u9650\u53d6\u4ee3 <tt> \u6578\u4f4d<\/tt> \u3002\u00a0 \u4f8b\u5982\uff0c\u5982\u679c\u985e\u5225 <tt> \u76d2\u5b50<\/tt> \u6709\u4e00\u500b\u985e\u578b\u7684\u79c1\u6709\u5b57\u6bb5 <tt> \u6642\u9593<\/tt> \u548c\u4e00\u500b\u65b9\u6cd5 <tt> void set(T\u5167\u5bb9) <\/tt> \u82e5\u8981\u8a2d\u5b9a\u6b64\u79c1\u6709\u5b57\u6bb5\uff0c\u5247\u8a72\u5b57\u6bb5\u7684\u985e\u578b\u70ba <tt> \u6578\u4f4d<\/tt> \u985e\u578b\u64e6\u9664\u5f8c\uff0c\u8a72\u65b9\u6cd5\u5c07\u88ab\u8f49\u63db\u70ba\u65b9\u6cd5 <tt> void set(\u6578\u5b57\u5167\u5bb9)<\/tt> .<\/li>\n<\/ol>\n<\/ol>\n<p>\u7bc4\u4f8b\uff08\u5728\u985e\u578b\u64e6\u9664\u4e2d\u4f7f\u7528\u985e\u578b\u53c3\u6578\u7684\u4e0a\u9650 &#8211; <i> \u524d<\/i> \u985e\u578b\u64e6\u9664\uff09\uff1a<br \/>\n<tt> \u985e Box&lt;<b> T \u64f4\u5145\u6578\u5b57<\/b> &gt; {\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u4eba\u7684 <b> \u6642\u9593<\/b> \u50f9\u503c;\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u4fe1\u7bb1(<b> \u6642\u9593<\/b> t) { \u503c = t; }\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> }\u00a0<\/tt><\/p>\n<ol>\n<ol>\u7bc4\u4f8b\uff08\u5728\u985e\u578b\u64e6\u9664\u4e2d\u4f7f\u7528\u985e\u578b\u53c3\u6578\u7684\u4e0a\u9650 &#8211;<\/ol>\n<\/ol>\n<p><i> \u5f8c<\/i><\/p>\n<ol>\n<ol>\u985e\u578b\u64e6\u9664\uff09\uff1a<\/ol>\n<\/ol>\n<p>&nbsp;<\/p>\n<p><tt> \u985e\u5225\u6846{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u4eba\u7684 <b> \u6578\u4f4d<\/b> \u50f9\u503c;\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u4fe1\u7bb1(<b> \u6578\u4f4d<\/b> t) { \u503c = t; }\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> }<\/tt><\/p>\n<ol>\u6b64\u5916\uff0c\u6700\u5de6\u908a\u7684\u4e0a\u9650\u51fa\u73fe\u5728\u5176\u4ed6\u4f4d\u7f6e\uff0c\u4f8b\u5982\u81ea\u52d5\u63d2\u5165\u7684\u5f37\u5236\u8f49\u63db\u548c\u6a4b\u63a5\u65b9\u6cd5\u3002<\/ol>\n<p>\u5982\u679c\u985e\u578b\u53c3\u6578\u5141\u8a31\u6709\u4e0b\u9650\uff0c\u5b83\u5011\u6703\u6216\u61c9\u8a72\u6709\u54ea\u4e9b\u526f\u4f5c\u7528\uff1f\u5982\u679c\u4e00\u500b\u7d50\u69cb\u5982 <tt> \u985e Box&lt;T <b> \u5049\u5927\u7684<\/b> \u7de8\u865f&gt; {...} <\/tt> \u88ab\u5141\u8a31\u4e86\uff0c\u9019\u610f\u5473\u8457\u4ec0\u9ebc\uff1f\u00a0 \u4e0a\u9650\u985e\u578b\u53c3\u6578\u754c\u9650\u7684 3 \u500b\u526f\u4f5c\u7528 &#8211; \u53d7\u9650\u5be6\u4f8b\u5316\u3001\u5b58\u53d6\u975e\u975c\u614b\u6210\u54e1\u3001\u985e\u578b\u64e6\u9664 &#8211; \u5c0d\u65bc\u4e0b\u9650\u610f\u5473\u8457\u4ec0\u9ebc\uff1f<\/p>\n<p><i> \u53d7\u9650\u5b9e\u4f8b\u5316\u3002 <\/i> \u7f16\u8bd1\u5668\u53ef\u4ee5\u9650\u5236\u53ef\u7528\u4e8e\u5177\u6709\u4e0b\u9650\u7c7b\u578b\u53c2\u6570\u7684\u6cdb\u578b\u7c7b\u578b\u5b9e\u4f8b\u5316\u7684\u7c7b\u578b\u96c6\u3002\u00a0 \u4f8b\u5982\uff0c\u7f16\u8bd1\u5668\u53ef\u4ee5\u5141\u8bb8\u5b9e\u4f8b\u5316\uff0c\u4f8b\u5982 <tt> \u76d2\u5b50&lt;\u6578\u91cf&gt;<\/tt> \u548c <tt> \u76d2\u5b50&lt;\u7269\u4ef6&gt;<\/tt> \u4ece\u4e00\u4e2a <tt> \u76d2\u5b50&lt;T <b> \u5049\u5927\u7684<\/b> \u7f16\u53f7&gt; <\/tt> \u5e76\u62d2\u7edd\u5b9e\u4f8b\u5316\uff0c\u4f8b\u5982 <tt> \u6846&lt;\u9577&gt;<\/tt> \u6216\u8005 <tt> \u6846&lt;\u77ed&gt;<\/tt> \u3002\u00a0 \u8fd9\u5c06\u662f\u4e0e\u7c7b\u578b\u53c2\u6570\u4e0a\u9650\u6240\u63cf\u8ff0\u7684\u9650\u5236\u6027\u526f\u4f5c\u7528\u4e00\u81f4\u7684\u6548\u679c\u3002<\/p>\n<p><i> \u5b58\u53d6\u975e\u975c\u614b\u6210\u54e1\u3002 <\/i> \u8f83\u4f4e\u7684\u7c7b\u578b\u53c2\u6570\u754c\u9650\u4e0d\u5141\u8bb8\u8bbf\u95ee\u9664\u4ece\u7c7b\u7ee7\u627f\u7684\u65b9\u6cd5\u4e4b\u5916\u7684\u4efb\u4f55\u7279\u5b9a\u65b9\u6cd5 <tt> \u76ee\u7684<\/tt> \u3002\u5728\u793a\u4f8b\u4e2d <tt> \u76d2\u5b50&lt;T <b> \u5049\u5927\u7684<\/b> \u7f16\u53f7&gt; <\/tt> \u7684\u8d85\u7c7b\u578b <tt> \u6578\u4f4d<\/tt> \u6ca1\u6709\u4efb\u4f55\u5171\u540c\u70b9\uff0c\u9664\u4e86\u5b83\u4eec\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u56e0\u6b64\u662f\u5f15\u7528\u7c7b\u578b\u7684\u5b50\u7c7b\u578b <tt> \u76ee\u7684<\/tt> \u3002\u00a0 \u7f16\u8bd1\u5668\u4e0d\u80fd\u5047\u8bbe\u7c7b\u578b\u7684\u5b57\u6bb5 <tt> \u6642\u9593<\/tt> \u5c5e\u4e8e\u7c7b\u578b <tt> \u6578\u4f4d<\/tt> \u6216\u5176\u5b50\u7c7b\u578b\u3002\u00a0 \u76f8\u53cd\uff0c\u7c7b\u578b\u5b57\u6bb5 <tt> \u6642\u9593<\/tt> \u53ef\u4ee5\u662f\u4efb\u4f55\u8d85\u7c7b\u578b <tt> \u6578\u4f4d<\/tt> \uff0c \u4f8b\u5982 <tt> \u53ef\u4e32\u884c\u5316<\/tt> \u6216\u8005 <tt> \u76ee\u7684<\/tt> \u3002\u00a0 \u8c03\u7528\u8bf8\u5982 <tt> intValue()<\/tt> \u4e0d\u518d\u662f\u7c7b\u578b\u5b89\u5168\u7684\uff0c\u7f16\u8bd1\u5668\u5c06\u4e0d\u5f97\u4e0d\u62d2\u7edd\u5b83\u3002\u56e0\u6b64\uff0c\u8f83\u4f4e\u7684\u7c7b\u578b\u53c2\u6570\u754c\u9650\u5c06\u65e0\u6cd5\u8bbf\u95ee\u7c7b\u4e2d\u5b9a\u4e49\u7684\u975e\u9759\u6001\u6210\u5458 <tt> \u76ee\u7684<\/tt> \u56e0\u6b64\u4e0e\u201c\u65e0\u754c\u9650\u201d\u5177\u6709\u76f8\u540c\u7684\u6548\u679c\u3002<\/p>\n<p><i> \u7c7b\u578b\u64e6\u9664<\/i> \u3002\u00a0 \u6309\u7167\u8fd9\u6761\u903b\u8f91\u7ebf\uff0c\u7528\u6700\u5de6\u8fb9\u7684\u4e0b\u754c\u66ff\u6362\u7c7b\u578b\u53c2\u6570\u7684\u51fa\u73b0\u662f\u6ca1\u6709\u610f\u4e49\u7684\u3002\u00a0 \u58f0\u660e\u4e00\u4e2a\u7c7b\u4f3c\u4e8e\u6784\u9020\u51fd\u6570\u7684\u65b9\u6cd5 <tt> \u76d2\u5b50\uff08<b> \u6642\u9593<\/b> t) <\/tt> \u4f5c\u4e3a\u6784\u9020\u51fd\u6570 <tt> \u76d2\u5b50\uff08<b> \u6578\u4f4d<\/b> t)<\/tt> \u6ca1\u6709\u610f\u4e49\uff0c\u8003\u8651\u5230 <tt> \u6642\u9593<\/tt> \u88ab\u66ff\u6362\u4e3a\u8d85\u7c7b\u578b <tt> \u6578\u4f4d<\/tt> \u3002\u00a0 \u4e00\u4e2a <tt> \u76ee\u7684<\/tt> \u53ef\u80fd\u4f1a\u5728\u5b9e\u4f8b\u5316\u4e2d\u6b63\u786e\u4f20\u9012\u7ed9\u6784\u9020\u51fd\u6570 <tt> \u76d2\u5b50&lt;\u7269\u4ef6&gt;<\/tt> \u5e76\u4e14\u6784\u9020\u51fd\u6570\u4f1a\u62d2\u7edd\u5b83\u3002\u00a0 \u8fd9\u7edd\u5bf9\u662f\u9519\u8bef\u7684\u3002\u00a0\u00a0 \u56e0\u6b64\uff0c\u7c7b\u578b\u64e6\u9664\u5c06\u66ff\u6362\u6240\u6709\u51fa\u73b0\u7684\u7c7b\u578b\u53d8\u91cf<tt> \u6642\u9593<\/tt> \u6309\u985e\u578b <tt> \u76ee\u7684<\/tt> \uff0c\u800c\u4e0d\u662f\u5176\u4e0b\u9650\u3002\u00a0 \u540c\u6a23\uff0c\u4e0b\u9650\u8207\u300c\u7121\u754c\u9650\u300d\u6709\u76f8\u540c\u7684\u6548\u679c\u3002<\/p>\n<p>\u4f60\u60f3\u77e5\u9053\u5982\u679c\u5169\u8005\u90fd\u964d\u4f4e\u610f\u5473\u8457\u4ec0\u9ebc\u55ce\uff1f <i> _\u548c_<\/i> \u5141\u8a31\u4e0a\u9650\u55ce\uff1f\u00a0\u00a0 \u5c31\u6211\u500b\u4eba\u800c\u8a00\uff0c\u5982\u679c\u60a8\u5141\u8a31\u7684\u8a71\uff0c\u6211\u4ec0\u81f3\u4e0d\u60f3\u8003\u616e\u5b83\uff0c\u4e26\u4e14\u66f4\u9858\u610f\u5c07\u5176\u6b78\u6a94\u70ba\u300c\u7121\u6cd5\u7ba1\u7406\u300d\u3002<\/p>\n<p>\u5e95\u7dda\u662f\uff1a\u6240\u6709\u9019\u4e00\u5207\u90fd\u662f\u201c<tt> \u5049\u5927\u7684<\/tt> \u300cbound will buy you \u662f\u53ea\u6709\u8d85\u985e\u578b\u7684\u9650\u5236 <tt> \u6578\u4f4d<\/tt> \u53ef\u4ee5\u7528\u4f5c\u985e\u578b\u53c3\u6578\u3002\u00a0 \u751a\u81f3\u9019\u4e00\u9ede\u4e5f\u5e38\u88ab\u8aa4\u89e3\u3002\u00a0 \u9019\u4e26\u4e0d\u610f\u5473\u8457 <tt> \u985e\u5225 Box&lt;T \u8d85\u7d1a Number&gt; {...}<\/tt> \u50c5\u5305\u542b\u8d85\u985e\u578b\u7684\u5be6\u4f8b <tt> \u6578\u4f4d<\/tt> \u3002\u00a0 \u525b\u597d\u76f8\u53cd &#8211; \u6b63\u5982\u4e0b\u9762\u7684\u7bc4\u4f8b\u6240\u793a\uff01<\/p>\n<p>\u7bc4\u4f8b\uff08\u5728\u985e\u578b\u64e6\u9664\u4e2d\u4f7f\u7528\u985e\u578b\u53c3\u6578\u7684\u4e0a\u9650 &#8211; <i> \u524d<\/i> \u985e\u578b\u64e6\u9664\uff09\uff1a<\/p>\n<div style=\"margin-left:40px;\">\n<blockquote><p><tt> \u985e Box&lt;<b> T\u8d85\u7d1a\u865f\u78bc<\/b> &gt; {<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u4eba\u7684 <b> \u6642\u9593<\/b> \u50f9\u503c;<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u4fe1\u7bb1(<b> \u6642\u9593<\/b> t) { \u503c = t; }<\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<\/div>\n<p>\u7bc4\u4f8b\uff08\u5728\u985e\u578b\u64e6\u9664\u4e2d\u4f7f\u7528\u985e\u578b\u53c3\u6578\u7684\u4e0a\u9650 &#8211; <i> \u5f8c<\/i> \u985e\u578b\u64e6\u9664\uff09\uff1a<\/p>\n<div style=\"margin-left:40px;\">\n<blockquote><p><tt> \u985e\u5225\u6846{<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u4eba\u7684 <b> \u76ee\u7684<\/b> \u50f9\u503c;<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u4fe1\u7bb1(<b> \u76ee\u7684<\/b> t) { \u503c = t; }<\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<\/div>\n<p>\u4e00\u500b <tt> \u985e Box&lt;T <b> \u5049\u5927\u7684<\/b> \u7de8\u865f&gt; {...} <\/tt> \u5c07\u900f\u904e\u985e\u578b\u64e6\u9664\u8f49\u63db\u70ba <tt> \u76d2\u5b50<\/tt> \u542b\u6709\u4e00\u500b <tt> \u76ee\u7684<\/tt> \u5b57\u6bb5\u53ca\u5176\u5efa\u69cb\u51fd\u6578\u5c07\u88ab\u8f49\u63db\u70ba <tt> \u76d2\u5b50\uff08\u7269\u4ef6t\uff09<\/tt> \u3002\u9019\u8207 <tt> \u985e Box&lt;T <b> \u5ef6\u4f38<\/b> \u7de8\u865f&gt; {...}<\/tt> \uff0c\u9019\u5c07\u88ab\u7ffb\u8b6f\u6210 <tt> \u76d2\u5b50<\/tt> \u542b\u6709\u4e00\u500b <tt> \u6578\u4f4d<\/tt> \u5b57\u6bb5\u53ca\u5176\u5efa\u69cb\u51fd\u6578\u5c07\u88ab\u8f49\u63db\u70ba <tt> \u76d2\u5b50(\u6578\u91cft)<\/tt> \u3002\u56e0\u6b64\uff0c\u4e00\u500b <tt> \u76d2\u5b50&lt;\u6578\u91cf&gt;<\/tt> \u5be6\u4f8b\u5316\u81ea<tt> \u985e\u5225 Box&lt;T \u64f4\u5145 Number&gt; {...}<\/tt> \u6703\u4e0d\u540c\u65bc <tt> \u76d2\u5b50&lt;\u6578\u91cf&gt;<\/tt> \u5be6\u4f8b\u5316\u4f86\u81ea <tt> \u985e\u5225 Box&lt;T \u8d85\u7d1a Number&gt; {...}<\/tt> \uff0c\u9019\u53ef\u80fd\u6703\u5f15\u8d77\u6df7\u4e82\u3002\u00a0 \u56e0\u6b64\uff0c\u4e0b\u9650\u5c0d\u65bc\u985e\u5225\u7684\u578b\u5225\u53c3\u6578\u6c92\u6709\u610f\u7fa9\u3002<\/p>\n<p>&nbsp;<\/p>\n<hr width=\"100%\" \/>\n<p>&nbsp;<\/p>\n<p><b>\u65b9\u6cd5\u7684\u4e0b\u754c\u985e\u578b\u53c3\u6578<\/b><\/p>\n<p>\u8207\u65b9\u6cd5\u53ca\u5176\u53c3\u6578\u985e\u578b\u7d50\u5408\u4f7f\u7528\u6642\uff0c\u5177\u6709\u4e0b\u9650\u7684\u985e\u578b\u53c3\u6578\u6709\u6642\u6703\u5f88\u6709\u7528\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u53d7\u76ca\u65bc\u5177\u6709\u4e0b\u9650\u7684\u578b\u5225\u53c3\u6578\u7684\u65b9\u6cd5\uff09\uff1a<\/p>\n<blockquote><p><tt> \u985e Pair&lt;X,Y&gt; {<\/tt><br \/>\n<tt> \u00a0\u00a0 \u9996\u5148\u662f\u79c1\u6709X\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u4ebaY\u7b2c\u4e8c\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171&lt;<b> \u4e00\u500b\u8d85\u7d1aX<\/b> ,<b> B\u8d85Y<\/b> &gt; B addToMap(Map&lt;A,B&gt; map) { \/\/ \u932f\u8aa4\uff1a\u578b\u5225\u53c3\u6578\u4e0d\u80fd\u6709\u4e0b\u9650<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56demap.put\uff08\u7b2c\u4e00\uff0c\u7b2c\u4e8c\uff09\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0 }<\/tt><br \/>\n<tt> }<\/tt><br \/>\n<tt> \u985e\u5225\u6e2c\u8a66{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u975c\u614b\u7121\u6548\u4e3b\uff08\u5b57\u4e32[] args\uff09{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Pair&lt;String,Long&gt; \u5c0d = new Pair&lt;&gt;(\"ABC\",42L);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Map&lt;CharSequence\uff0cNumber&gt; \u6620\u5c04 = HashMap&lt;CharSequence\uff0cNumber&gt;();<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Number number =pair.addToMap(map);<\/tt><br \/>\n<tt> \u00a0\u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u9019 <tt> \u52a0\u5165\u5730\u5716()<\/tt> \u65b9\u6cd5\u5c07\u8a72\u5c0d\u7684\u5167\u5bb9\u65b0\u589e\u81f3\u5730\u5716\u3002\u00a0 \u4efb\u4f55\u53ef\u4ee5\u5bb9\u7d0d\u8d85\u985e\u578b\u7684\u6620\u5c04 <tt> X<\/tt> \u548c <tt> \u662f<\/tt> \u6703\u505a\u7684\u3002\u00a0 \u5730\u5716\u7684 <tt> \u653e\uff08\uff09<\/tt> \u5982\u679c\u6620\u5c04\u4e2d\u5df2\u5b58\u5728\u8a72\u9375\u7684\u9375\u503c\u689d\u76ee\uff0c\u5247\u65b9\u6cd5\u6703\u50b3\u56de\u5728\u6620\u5c04\u4e2d\u627e\u5230\u7684\u7d66\u5b9a\u9375\u7684\u503c\u3002\u00a0 \u5730\u5716\u7684\u56de\u50b3\u503c <tt> \u653e\uff08\uff09<\/tt> \u65b9\u6cd5\u61c9\u5f9e\u8fd4\u56de <tt> \u52a0\u5165\u5730\u5716()<\/tt> \u65b9\u6cd5\u3002\u00a0 \u5728\u9019\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4eba\u5011\u5e0c\u671b\u5ba3\u544a\u5982\u4e0a\u6240\u793a\u7684\u65b9\u6cd5\uff1a\u6620\u5c04\u4f7f\u7528\u8a72\u5c0d\u7684\u985e\u578b\u53c3\u6578\u7684\u8d85\u985e\u578b\u548c <tt> \u52a0\u5165\u5730\u5716()<\/tt> \u65b9\u6cd5\u7684\u50b3\u56de\u985e\u578b\u662f\u6620\u5c04\u7684\u503c\u985e\u578b\u3002<\/p>\n<p>\u7531\u65bc\u7de8\u8b6f\u5668\u4e0d\u5141\u8a31\u578b\u5225\u53c3\u6578\u7684\u4e0b\u9650\uff0c\u6211\u5011\u9700\u8981\u4e00\u500b\u89e3\u6c7a\u65b9\u6cd5\u3002<\/p>\n<p>\u6211\u60f3\u5230\u7684\u89e3\u6c7a\u65b9\u6cd5\u662f\u4f7f\u7528\u901a\u914d\u7b26\uff0c\u56e0\u70ba\u901a\u914d\u7b26\u53ef\u4ee5\u6709\u4e0b\u9650\u3002\u00a0 \u9019\u662f\u4f7f\u7528\u842c\u7528\u5b57\u5143\u7684\u89e3\u6c7a\u65b9\u6cd5\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u4f7f\u7528\u901a\u914d\u7b26\u89e3\u6c7a\u4e0a\u4e00\u500b\u7bc4\u4f8b\u7684\u65b9\u6cd5\uff09\uff1a<\/p>\n<blockquote><p><tt> \u985e Pair&lt;X,Y&gt; {<\/tt><br \/>\n<tt> \u00a0\u00a0 \u9996\u5148\u662f\u79c1\u6709X\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u4ebaY\u7b2c\u4e8c\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> \u00a0\u00a0 \u6c11\u773e <b> \u76ee\u7684<\/b> \u52a0\u5165\u5730\u5716\uff08\u5730\u5716&lt;<b> \uff1f\u8d85\u7d1aX<\/b> , <b> \uff1f\u8d85\u7d1aY<\/b> &gt; \u5730\u5716\uff09{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56demap.put\uff08\u7b2c\u4e00\uff0c\u7b2c\u4e8c\uff09\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0 }<\/tt><br \/>\n<tt> }<\/tt><br \/>\n<tt> \u985e\u5225\u6e2c\u8a66{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u975c\u614b\u7121\u6548\u4e3b\uff08\u5b57\u4e32[] args\uff09{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Pair&lt;String,Long&gt; \u5c0d = new Pair&lt;&gt;(\"ABC\",42L);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Map&lt;CharSequence\uff0cNumber&gt; \u6620\u5c04 = HashMap&lt;CharSequence\uff0cNumber&gt;();<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 \u6578\u91cf \u6578\u91cf = <b> \uff08\u6578\u5b57\uff09<\/b> \u5c0d.addToMap(\u5730\u5716);<\/tt><br \/>\n<tt> \u00a0\u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u5b83\u53ef\u4ee5\u5de5\u4f5c\uff0c\u53ea\u662f\u7121\u6cd5\u6839\u64da\u9700\u8981\u8072\u660e\u8fd4\u56de\u985e\u578b\u3002\u00a0 \u9019\u5c07\u662f\u4ee5\u4e0b\u7684\u8d85\u985e\u578b <tt> \u662f<\/tt> \u7de8\u8b6f\u5668\u5f9e\u6620\u5c04\u985e\u578b\u6355\u7372\uff0c\u4f46\u6c92\u6709\u6307\u5b9a\u5b83\u7684\u8a9e\u6cd5\u3002\u00a0 \u6211\u5011\u4e0d\u80fd\u5c07\u8fd4\u56de\u985e\u578b\u8072\u660e\u70ba\u201c<tt> \uff1f\u8d85\u7d1aY<\/tt> \u201c\uff0c \u56e0\u70ba \u201d<tt> \uff1f\u8d85\u7d1aY<\/tt> &#8221; \u662f\u901a\u914d\u7b26\u800c\u4e0d\u662f\u985e\u578b\uff0c\u56e0\u6b64\u4e0d\u5141\u8a31\u4f5c\u70ba\u8fd4\u56de\u985e\u578b\u3002\u6211\u5011\u5225\u7121\u9078\u64c7\uff0c\u5fc5\u9808\u4f7f\u7528 <tt> \u76ee\u7684<\/tt> \u76f8\u53cd\u5730\u200b\u200b\u4f5c\u70ba\u6211\u5011\u65b9\u6cd5\u7684\u8fd4\u56de\u985e\u578b\u3002\u00a0 \u9019\u7a2e\u76f8\u7576\u4e0d\u7279\u5b9a\u7684\u8fd4\u56de\u985e\u578b\u53cd\u904e\u4f86\u53c8\u8feb\u4f7f\u547c\u53eb\u8005 <tt> \u52a0\u5165\u5730\u5716()<\/tt> \u65b9\u6cd5\u5c07\u56de\u50b3\u503c\u5411\u4e0b\u8f49\u63db <tt> \u76ee\u7684<\/tt> \u5176\u5be6\u969b\u985e\u578b\u3002\u00a0 \u9019\u4e26\u4e0d\u5b8c\u5168\u662f\u6211\u5011\u7684\u60f3\u6cd5\u3002<\/p>\n<p>\u53e6\u4e00\u7a2e\u89e3\u6c7a\u65b9\u6cd5\u662f\u4f7f\u7528\u975c\u614b\u65b9\u6cd5\u3002\u00a0 \u9019\u662f\u4f7f\u7528\u975c\u614b\u65b9\u6cd5\u800c\u4e0d\u662f\u975e\u975c\u614b\u65b9\u6cd5\u7684\u89e3\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u4f7f\u7528\u975c\u614b\u65b9\u6cd5\u89e3\u6c7a\u4e0a\u4e00\u500b\u7bc4\u4f8b\u7684\u65b9\u6cd5\uff09\uff1a<\/p>\n<blockquote><p><tt> \u985e Pair&lt;X,Y&gt; {<\/tt><br \/>\n<tt> \u00a0\u00a0 \u9996\u5148\u662f\u79c1\u6709X\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0 \u79c1\u4ebaY\u7b2c\u4e8c\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0 ...<\/tt><br \/>\n<tt> \u00a0\u00a0 \u6c11\u773e <b> \u975c\u6b62\u7684<\/b> &lt;<b> \u4e00\u500b<\/b> ,<b> \u4e59<\/b> ,X <b> \u5ef6\u4f38 A<\/b> ,Y <b> \u5ef6\u4f38 B<\/b> &gt; B addToMap(Pair&lt;X,Y&gt; \u5c0d, Map&lt;<b> \u4e00\u500b<\/b> ,<b> \u4e59<\/b> &gt; \u5730\u5716\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 return map.put(pair.first,pair.second);<\/tt><br \/>\n<tt> \u00a0\u00a0 }<\/tt><br \/>\n<tt> }<\/tt><br \/>\n<tt> \u985e\u5225\u6e2c\u8a66{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0 \u516c\u5171\u975c\u614b\u7121\u6548\u4e3b\uff08\u5b57\u4e32[] args\uff09{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Pair&lt;String,Long&gt; \u5c0d = new Pair&lt;&gt;(\"ABC\",42L);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 Map&lt;CharSequence\uff0cNumber&gt; \u6620\u5c04 = HashMap&lt;CharSequence\uff0cNumber&gt;();<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0 \u6578\u91cf \u6578\u91cf = <b> \u4e00\u5c0d<\/b> .addToMap(<b> \u4e00\u5c0d<\/b> \uff0c\u5730\u5716\uff09;<\/tt><br \/>\n<tt> \u00a0\u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u901a\u7528\u7684 <tt> \u52a0\u5165\u5730\u5716()<\/tt> \u65b9\u6cd5\u6709\u56db\u500b\u578b\u5225\u53c3\u6578\uff1a\u5169\u500b\u4f54\u4f4d\u7b26 <tt> X<\/tt> \u548c <tt> \u662f<\/tt> \u5c0d\u65bc\u8a72\u5c0d\u7684\u985e\u578b\u548c\u5169\u500b\u4f54\u4f4d\u7b26 <tt> \u4e00\u500b<\/tt> \u548c <tt> \u4e59 <\/tt> \u5c0d\u65bc\u5730\u5716\u7684\u985e\u578b\u3002 <tt> \u4e00\u500b<\/tt> \u548c <tt> \u4e59<\/tt> \u662f\u8d85\u985e\u578b <tt> X<\/tt> \u548c <tt> \u662f<\/tt> \uff0c \u56e0\u70ba <tt> X<\/tt> \u548c <tt> \u662f<\/tt> \u00a0 \u8072\u660e\u70ba <tt> \u4e00\u500b<\/tt> \u548c <tt> \u4e59<\/tt> \u4f5c\u70ba\u5b83\u5011\u7684\u4e0a\u9650\u3002 \uff08\u6ce8\u610f\uff0c\u6cdb\u578b\u65b9\u6cd5\u7684\u578b\u5225\u53c3\u6578 <tt> X<\/tt> \u548c <tt> \u662f<\/tt> \u8207 <tt> \u4e00\u5c0d<\/tt> \u73ed\u7d1a\u7684 <tt> X<\/tt> \u548c <tt> \u662f<\/tt> \u53c3\u6578\u3002\u00a0 \u540d\u5b57 <tt> X<\/tt> \u548c <tt> \u662f<\/tt> \u88ab\u91cd\u7528\u65bc\u6cdb\u578b\u65b9\u6cd5\uff0c\u4f7f\u5b83\u5011\u6613\u65bc\u8b58\u5225\u70ba\u8a72\u5c0d\u7684\u985e\u578b\u53c3\u6578\u3002\u4f7f\u7528\u56db\u500b\u985e\u578b\u53c3\u6578\uff0c\u6211\u5011\u53ef\u4ee5\u6839\u64da\u9700\u8981\u8072\u660e\u7cbe\u78ba\u7684\u56de\u50b3\u985e\u578b\uff1a\u5b83\u8207\u6620\u5c04\u7684\u503c\u985e\u578b\u76f8\u540c\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u5728\u6cdb\u578b\u985e\u5225\u7684\u975c\u614b\u4e0a\u4e0b\u6587\u4e2d\u975e\u6cd5\u4f7f\u7528\u985e\u578b\u53c3\u6578\uff09\uff1a<\/p>\n<blockquote><p><tt> \u985e\u67d0\u985e<b> <span style=\"color:#000099;\"> &lt;T&gt;<\/span> <\/b> {<\/tt><br \/>\n<tt> \u00a0 \/\/ <\/tt> <i> \u975c\u614b\u521d\u59cb\u503c\u8a2d\u5b9a\u9805\u3001\u975c\u614b\u6b04\u4f4d\u3001\u975c\u614b\u65b9\u6cd5<\/i><br \/>\n<tt> \u00a0 <b> \u975c\u6b62\u7684<\/b> {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u4e00\u4e9b\u985e&lt;<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> &gt; \u6e2c\u8a66 = \u65b0 SomeClass&lt;<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> &gt;(); <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u79c1\u4eba\u7684 <b> \u975c\u6b62\u7684<\/b> <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u5168\u5c40\u8cc7\u8a0a\uff1b\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0 \u6c11\u773e\u00a0 <b> \u975c\u6b62\u7684<\/b> <b> <span style=\"color:#000099;\"> \u6642\u9593 <\/span> <\/b> \u53d6\u5f97\u5168\u57df\u8cc7\u8a0a\uff08\uff09{\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u8fd4\u56de\u5168\u57df\u8cc7\u8a0a\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \/\/ <\/tt> <i> \u975e\u975c\u614b\u521d\u59cb\u5316\u5668\u3001\u975e\u975c\u614b\u6b04\u4f4d\u3001\u975e\u975c\u614b\u65b9\u6cd5<\/i><br \/>\n<tt> \u00a0 {\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u4e00\u4e9b\u985e&lt;<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> &gt; \u6e2c\u8a66 = \u65b0 SomeClass&lt;<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> &gt;();<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u79c1\u4eba\u7684\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u672c\u5730\u8cc7\u8a0a\uff1b<\/tt><br \/>\n<tt> \u00a0 \u6c11\u773e\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u53d6\u5f97\u672c\u5730\u8cc7\u8a0a\uff08\uff09{\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u8fd4\u56de\u672c\u5730\u8cc7\u8a0a\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \/\/ <\/tt> <i> \u975c\u614b\u5de2\u72c0\u985e\u578b<\/i><br \/>\n<tt> \u00a0 \u6c11\u773e <b> \u975c\u6b62\u7684<\/b> <b> \u73ed\u7d1a<\/b> \u5931\u6557\u64f4\u5c55\u7570\u5e38{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u79c1\u4eba\u6c7a\u8cfd <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u8cc7\u8a0a;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u5931\u6557\uff08<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> t) { \u4fe1\u606f = t; }\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u6c11\u773e <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> getInfo() { \u56de\u50b3\u8a0a\u606f\uff1b }\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u79c1\u4eba\u7684 <b> \u4ecb\u9762<\/b> \u53ef\u8907\u88fd{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u8907\u88fd\uff08\uff09;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u79c1\u4eba\u7684 <b> \u679a\u4e3e<\/b> \u72c0\u614b {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u6709\u6548\u3001\u7121\u6548\uff1b<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u79c1\u4eba\u7684 <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u8a0a\u606f; \/\/ \u932f\u8aa4<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u516c\u5171\u7121\u6548\u8a2d\u5b9a\u8cc7\u8a0a\uff08<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> t) { \u4fe1\u606f = t; } <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u6c11\u773e <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> getInfo() { \u56de\u50b3\u8a0a\u606f\uff1b }\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \/\/ <\/tt> <i> \u975e\u9759\u6001\u5d4c\u5957\u7c7b\u578b<\/i><br \/>\n<tt> \u00a0 \u6c11\u773e <b> \u73ed\u7d1a<\/b> \u8bbf\u95ee\u5668{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u6c11\u773e <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> getInfo() { \u8fd4\u56de\u672c\u5730\u4fe1\u606f\uff1b }<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u8be5\u793a\u4f8b\u8bf4\u660e\u7c7b\u578b\u53c2\u6570\u4e0d\u80fd\u5728\u6cdb\u578b\u7c7b\u7684\u9759\u6001\u4e0a\u4e0b\u6587\u4e2d\u4f7f\u7528\u3002\u00a0 \u5b83\u8fd8\u8868\u660e\u5d4c\u5957\u63a5\u53e3\u548c\u679a\u4e3e\u7c7b\u578b\u88ab\u89c6\u4e3a\u7c7b\u7684\u9759\u6001\u7c7b\u578b\u6210\u5458\u3002\u00a0 \u53ea\u6709\u5185\u90e8\u7c7b\uff08\u5373\u975e\u9759\u6001\u5d4c\u5957\u7c7b\uff09\u53ef\u4ee5\u4f7f\u7528\u5c01\u95ed\u6cdb\u578b\u7c7b\u7684\u7c7b\u578b\u53c2\u6570\u3002<\/p>\n<p>\u63a5\u53e3\u7c7b\u578b\u53c2\u6570\u7684\u8303\u56f4\u662f\u63a5\u53e3\u7684\u6574\u4e2a\u5b9a\u4e49\uff0c\u4efb\u4f55\u5b57\u6bb5\u6216\u5d4c\u5957\u7c7b\u578b\u9664\u5916\u3002\u00a0 \u8fd9\u662f\u56e0\u4e3a\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u5b57\u6bb5\u548c\u5d4c\u5957\u7c7b\u578b\u662f\u9690\u5f0f\u9759\u6001\u7684\u3002<\/p>\n<p>\u793a\u4f8b\uff08\u5728\u6cdb\u578b\u63a5\u53e3\u4e2d\u975e\u6cd5\u4f7f\u7528\u7c7b\u578b\u53c2\u6570\uff09\uff1a<\/p>\n<blockquote><p><tt> \u63a5\u53e3 SomeInterface<b> <span style=\"color:#000099;\"> &lt;T&gt;<\/span> <\/b> {<\/tt><br \/>\n<tt> \u00a0 \/\/ <\/tt> <i> \u573a\u5730<\/i><br \/>\n<tt> \u00a0 \u4e00\u4e9b\u985e&lt;<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> &gt; \u503c = \u65b0 SomeClass&lt;<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> &gt;();\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0 \/\/ <\/tt> <i> \u5d4c\u5957\u7c7b\u578b<\/i><br \/>\n<tt> \u00a0 <b> \u73ed\u7d1a<\/b> \u8bbf\u95ee\u5668{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 \u6c11\u773e <b> <span style=\"color:#000099;\"> \u6642\u9593 <\/span> <\/b> \u7372\u53d6\u8cc7\u8a0a\uff08\uff09{\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <b> <span style=\"color:#660000;\"> \/\/ \u932f\u8aa4<\/span> <\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u50b3\u56de\u503c.getGlobalInfo();<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \/\/ <\/tt> <i> \u65b9\u6cd5<\/i><br \/>\n<tt> \u00a0 <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u83b7\u53d6\u503c\uff08\uff09\uff1b<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u8be5\u793a\u4f8b\u663e\u793a\u63a5\u53e3\u7684\u5b57\u6bb5\u662f\u9690\u5f0f\u9759\u6001\u7684\uff0c\u56e0\u6b64\u7c7b\u578b\u53c2\u6570\u4e0d\u80fd\u5728\u6cdb\u578b\u63a5\u53e3\u7684\u5b57\u6bb5\u58f0\u660e\u4e2d\u7684\u4efb\u4f55\u4f4d\u7f6e\u4f7f\u7528\u3002\u00a0 \u540c\u6837\uff0c\u5d4c\u5957\u7c7b\u88ab\u89c6\u4e3a\u9759\u6001\u5d4c\u5957\u7c7b\uff0c\u800c\u4e0d\u662f\u5185\u90e8\u7c7b\uff0c\u56e0\u6b64\u5728\u5d4c\u5957\u7c7b\u4e2d\u7684\u4efb\u4f55\u4f4d\u7f6e\u4f7f\u7528\u7c7b\u578b\u53c2\u6570\u90fd\u662f\u975e\u6cd5\u7684\u3002<\/p>\n<p><b> <i> \u5d4c\u5957\u9759\u6001\u7c7b\u548c\u63a5\u53e3\u7684\u89e3\u51b3\u65b9\u6cd5\uff1a<\/i> <\/b><\/p>\n<p>\u5bf9\u4e8e\u9759\u6001\u5d4c\u5957\u7c7b\u548c\u63a5\u53e3\uff0c\u8fd9\u4e0d\u662f\u4e00\u4e2a\u5927\u707e\u96be\u3002\u00a0 \u4f5c\u4e3a\u89e3\u51b3\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u751f\u6210\u9759\u6001\u7c7b\u6216\u63a5\u53e3\u672c\u8eab\u3002<\/p>\n<p>\u793a\u4f8b\uff08\u89e3\u51b3\u65b9\u6cd5 &#8211; \u751f\u6210\u5d4c\u5957\u9759\u6001\u7c7b\u578b\uff09\uff1a<\/p>\n<blockquote><p><tt> \u7c7b\u5305\u88c5\u5668<b> <span style=\"color:#000099;\"> &lt;T&gt;<\/span> <\/b> {<\/tt><br \/>\n<tt> \u00a0 \u79c1\u4eba\u6c7a\u8cfd <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u5bf9\u8c61\uff1b<\/tt><\/p><\/blockquote>\n<blockquote><p><tt> \u00a0 \u516c\u5171\u5305\u88dd\uff08<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> t) { theObject = t; }<\/tt><br \/>\n<tt> \u00a0 \u6c11\u773e <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> getWrapper() { \u8fd4\u56de theObject; }<\/tt><tt> \u00a0 \u516c\u5171\u4e0d\u53ef\u8b8a<b> &lt;T&gt;<\/b> \u4f7f\u4e0d\u53ef\u53d8\uff08\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de\u65b0\u7684\u4e0d\u53ef\u8b8a\u7684<b> &lt;T&gt;<\/b> \uff08\u5bf9\u8c61\uff09\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u53ef\u8b8a<b> &lt;T&gt;<\/b> makeMutable() {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de\u65b0\u7684\u53ef\u8b8a<b> &lt;T&gt;<\/b> \uff08\u5bf9\u8c61\uff09\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u79c1\u6709\u975c\u614b &lt;A&gt; A makeClone(A theObject) { ... }<\/tt><\/p>\n<p><tt> \u00a0 \u516c\u5171\u975c\u614b\u6700\u7d42\u985e\u5225\u4e0d\u53ef\u8b8a<b> &lt;A&gt;<\/b> { <b> \/\/ \u73fe\u5728\u662f\u6cdb\u578b\u985e\u5225<\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u79c1\u4eba\u6c7a\u8cfd <b> \u4e00\u500b<\/b> \u5bf9\u8c61\uff1b<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u516c\u5171\u4e0d\u53ef\u8b8a\uff08<b> \u4e00\u500b<\/b> \u53c3\u6578\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 theObject = makeClone(arg);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6c11\u773e <b> \u4e00\u500b<\/b> getWrappedItem() {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de makeClone(theObject);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u975c\u614b\u985e\u5225\u53ef\u8b8a<b> &lt;A&gt;<\/b> {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ... \u76f8\u4f3c\u7684 ...<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u5c0d\u65bc\u5de2\u72c0\u679a\u8209\u985e\u578b\u6c92\u6709\u9019\u6a23\u7684\u89e3\u6c7a\u65b9\u6cd5\uff0c\u56e0\u70ba\u5b83\u5011\u4e0d\u80fd\u662f\u6cdb\u578b\u7684\u3002<\/p>\n<p><b> <i> \u5d4c\u5957\u975c\u614b\u985e\u5225\u7684\u89e3\u6c7a\u65b9\u6cd5\uff1a<\/i> <\/b><\/p>\n<p>\u5982\u679c\u5de2\u72c0\u975c\u614b\u985e\u578b\u662f\u4e00\u500b\u985e\uff0c\u5247\u53e6\u4e00\u7a2e\u89e3\u6c7a\u65b9\u6cd5\u662f\u5c07\u975c\u614b\u985e\u5225\u8f49\u63db\u70ba\u975e\u975c\u614b\u5167\u90e8\u985e\u5225\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u89e3\u6c7a\u65b9\u6cd5 &#8211; \u4f7f\u7528\u5167\u90e8\u985e\u5225\uff09\uff1a<\/p>\n<blockquote><p><tt> \u7c7b\u5305\u88c5\u5668<b> <span style=\"color:#000099;\"> &lt;T&gt;<\/span> <\/b> {<\/tt><br \/>\n<tt> \u00a0 \u79c1\u4eba\u6c7a\u8cfd <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u5bf9\u8c61\uff1b<\/tt><\/p><\/blockquote>\n<blockquote><p><tt> \u00a0 \u516c\u5171\u5305\u88dd\uff08<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> t) { theObject = t; }<\/tt><br \/>\n<tt> \u00a0 \u6c11\u773e <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> getWrapper() { \u8fd4\u56de theObject; }<\/tt><tt> \u00a0 \u516c\u5171\u53ef\u8b8a makeMutable() {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de <b> \u9019\u3002<\/b> \u65b0\u7684\u53ef\u8b8a\uff08theObject\uff09\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u4e0d\u53ef\u8b8a makeImmutable() {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de <b> \u9019\u3002<\/b> \u65b0\u7684\u4e0d\u53ef\u8b8a\uff08theObject\uff09\uff1b<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u79c1\u6709\u975c\u614b &lt;A&gt; A makeClone(A theObject) { ... }<\/tt><\/p>\n<p><tt> \u00a0 \u516c\u5171\u6700\u7d42\u985e\u5225\u4e0d\u53ef\u8b8a{\u00a0 <b> \/\/ \u4e0d\u518d\u662f\u975c\u614b\u985e<\/b> <\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u79c1\u4eba\u6c7a\u8cfd <b> \u6642\u9593<\/b> \u5bf9\u8c61\uff1b<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u516c\u5171\u4e0d\u53ef\u8b8a\uff08<b> \u6642\u9593<\/b> \u53c3\u6578\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 theObject = makeClone(arg);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u6c11\u773e <b> \u6642\u9593<\/b> getWrappedItem() {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de makeClone(theObject);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u985e\u5225\u53ef\u8b8a\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ... \u76f8\u4f3c\u7684 ...<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u9019\u7a2e\u89e3\u6c7a\u65b9\u6cd5\u6703\u5e36\u4f86\u4e00\u5b9a\u7684\u958b\u92b7\uff0c\u56e0\u70ba\u6240\u6709\u5167\u90e8\u985e\u5225\u90fd\u6709\u4e00\u500b\u5c0d\u5916\u90e8\u985e\u578b\u5be6\u4f8b\u7684\u96b1\u85cf\u5f15\u7528\uff0c\u5728\u672c\u4f8b\u4e2d\u5b83\u5011\u65e2\u4e0d\u9700\u8981\u4e5f\u4e0d\u5229\u7528\uff1b\u96b1\u85cf\u7684\u53c3\u8003\u53ea\u662f\u884c\u674e\u3002\u00a0 \u901a\u5e38\uff0c\u5167\u90e8\u985e\u5225\u8207\u4ecb\u9762\u7d44\u5408\u5728\u4e00\u8d77\uff0c\u4ee5\u4f7f\u5167\u90e8\u985e\u5225\u6210\u70ba\u5c01\u9589\u985e\u5225\u7684\u79c1\u6709\u5be6\u4f5c\u7d30\u7bc0\u3002\u00a0 \u6211\u5011\u4e5f\u53ef\u4ee5\u5728\u9019\u88e1\u505a\u540c\u6a23\u7684\u4e8b\u60c5\u3002<\/p>\n<p>\u7bc4\u4f8b\uff08\u6539\u9032\u4e86\u5148\u524d\u7684\u89e3\u6c7a\u65b9\u6cd5\uff09\uff1a<\/p>\n<blockquote><p><tt> \u7c7b\u5305\u88c5\u5668<b> <span style=\"color:#000099;\"> &lt;T&gt;<\/span> <\/b> {<\/tt><br \/>\n<tt> \u00a0 \u79c1\u4eba\u6c7a\u8cfd <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> \u5bf9\u8c61\uff1b<\/tt><\/p><\/blockquote>\n<blockquote><p><tt> \u00a0 \u516c\u5171\u5305\u88dd\uff08<b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> t) { theObject = t; }<\/tt><br \/>\n<tt> \u00a0 \u6c11\u773e <b> <span style=\"color:#000099;\"> \u6642\u9593<\/span> <\/b> getWrapper() { \u8fd4\u56de theObject; }<\/tt><tt> \u00a0 \u516c\u5171\u53ef\u8b8a<b> &lt;T&gt;<\/b> makeMutable() {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de this.new Mutable(theObject);<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u516c\u5171\u4e0d\u53ef\u8b8a<b> &lt;T&gt;<\/b> \u4f7f\u4e0d\u53ef\u53d8\uff08\uff09{<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de this.new Immutable(theObject);<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 \u79c1\u6709\u975c\u614b &lt;A&gt; A makeClone(A theObject) { ... }<\/tt><\/p>\n<p><tt> \u00a0 <b> \u516c\u5171\u4ecb\u9762 <\/b> \u4e0d\u53ef\u8b8a&lt;S&gt; {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 S getWrappedItem();<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 <b> \u516c\u5171\u4ecb\u9762 <\/b> \u53ef\u8b8a&lt;S&gt; {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 S getWrappedItem();<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u7121\u6548 setWrappedItem(S arg);<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 <b> \u79c1\u4eba\u7684<\/b> \u6700\u7d42\u985e\u5225 ImmutableImplementation <b> \u5be6\u4f5c Immutable&lt;T&gt;<\/b> {\u00a0<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u79c1\u6709\u6700\u7d42 T theObject\uff1b<\/tt><\/p>\n<p><tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u516c\u5171 ImmutableImplementation(T arg) {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 theObject = makeClone(arg);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 \u516c\u7528 T getWrappedItem() {<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de makeClone(theObject);<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0 }<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> \u00a0 <b> \u79c1\u4eba\u7684<\/b> \u53ef\u8b8a\u5be6\u4f5c\u985e\u5225 <b> \u5be6\u73fe Mutable&lt;T&gt;<\/b> {\u00a0<\/tt><br \/>\n<tt> \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ... \u76f8\u4f3c\u7684 ...<\/tt><br \/>\n<tt> \u00a0 }<\/tt><br \/>\n<tt> }<\/tt><\/p><\/blockquote>\n<p>\u5982\u60a8\u6240\u898b\uff0c\u5d4c\u5957\u7684\u516c\u5171\u4ecb\u9762\u5fc5\u9808\u662f\u901a\u7528\u7684\uff0c\u800c\u5167\u90e8\u79c1\u6709\u985e\u5225\u53ef\u4ee5\u4f7f\u7528\u5c01\u9589\u985e\u5225\u7684\u985e\u578b\u53c3\u6578\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<table width=\"100%\" cellpadding=\"10\">\n<tbody>\n<tr valign=\"TOP\">\n<td colspan=\"2\" width=\"68%\"><b>\u00a0<\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"2\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8acb\u53c3\u95b1\u6b64\u5e38\u898b\u554f\u984c\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\uff1a<br \/>\n<a href=\"http:\/\/www\" rel=\"nofollow\">http:\/\/www<\/a>. [&hellip;]<\/p>\n","protected":false},"author":65283547,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Generics in short form","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1017],"tags":[18369,2549795,6280762],"class_list":["post-31","post","type-post","status-publish","format-standard","hentry","category-1017","tag-18369","tag-2549795","tag-java-"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4CoHV-v","jetpack-related-posts":[{"id":2308,"url":"https:\/\/vkrastev1blog.com\/2026\/05\/29\/questions-and-informations-prepairing-for-java-developer-job-interview\/","url_meta":{"origin":31,"position":0},"title":"\u51c6\u5907 Java \u5f00\u53d1\u4eba\u5458\u9762\u8bd5\u7684\u95ee\u9898\u548c\u4fe1\u606f","author":"vkrastev2014","date":"29.05.2026","format":false,"excerpt":"\u0412\u044a\u043f\u0440\u043e\u0441\u0438 \u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u0437\u0430 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043a\u0430 \u0437\u0430 \u0438\u043d\u0442\u0435\u0440\u0432\u044e \u0437\u0430 \u0440\u0430\u0431\u043e\u0442\u0430 \u043a\u0430\u0442\u043e Java Developer \u041a\u0430\u043a\u0432\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0432\u0430\u0442 SOLID \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0438\u0442\u0435? \u041a\u0430\u043a\u0432\u043e \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0432\u0430 Single Responsibility Principle (SRP) \u0415\u0434\u0438\u043d \u043a\u043b\u0430\u0441 \u0442\u0440\u044f\u0431\u0432\u0430 \u0434\u0430 \u0438\u043c\u0430 \u0441\u0430\u043c\u043e \u0435\u0434\u043d\u0430 \u043e\u0442\u0433\u043e\u0432\u043e\u0440\u043d\u043e\u0441\u0442 \u0438 \u0441\u0430\u043c\u043e \u0435\u0434\u043d\u0430 \u043f\u0440\u0438\u0447\u0438\u043d\u0430 \u0434\u0430 \u0431\u044a\u0434\u0435 \u043f\u0440\u043e\u043c\u0435\u043d\u044f\u043d.\u041f\u043e\u043b\u0437\u0438\u0442\u0435 \u0432\u043a\u043b\u044e\u0447\u0432\u0430\u0442 \u043f\u043e-\u043b\u0435\u0441\u043d\u043e \u0442\u0435\u0441\u0442\u0432\u0430\u043d\u0435, \u043f\u043e-\u043d\u0438\u0441\u043a\u043e n\u0438\u0432\u043e \u043d\u0430 coupling \u0438 \u043f\u043e-\u0434\u043e\u0431\u0440\u0430 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u044f.\u041f\u0440\u0438\u043c\u0435\u0440: public class Book\u2026","rel":"","context":"In &quot;\u722a\u54c7&quot;","block_context":{"text":"\u722a\u54c7","link":"https:\/\/vkrastev1blog.com\/category\/%e7%88%aa%e5%93%87\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2026\/05\/image-9.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2026\/05\/image-9.png?resize=350%2C200&ssl=1 1x, 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<\/dependency> <!-- https:\/\/mvnrepository.com\/artifact\/com.github.hkirk\/java-html2image --> <dependency> <groupId>com.github.hkirk<\/groupId> <artifactId>java-html2image<\/artifactId> <version>0.9<\/version> <\/dependency> and Java code here\u2026","rel":"","context":"In &quot;\u722a\u54c7&quot;","block_context":{"text":"\u722a\u54c7","link":"https:\/\/vkrastev1blog.com\/category\/%e7%88%aa%e5%93%87\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":55,"url":"https:\/\/vkrastev1blog.com\/2014\/05\/11\/important-shell-script-commands-which-are-oft-used\/","url_meta":{"origin":31,"position":2},"title":"\u5e38\u7528\u7684\u91cd\u8981 Shell \u811a\u672c\u547d\u4ee4","author":"vkrastev2014","date":"11.05.2014","format":false,"excerpt":"Here is a list of some important shell commands: ---- Using Screen command screen -ls -- for a list of avaliable active screens screen -x .... - the Name from -ls output to join to this active screen Go out of the Screen with 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A Scientific and Philosophical Article from a Christian Perspective * Abstract Modern cosmology confronts humanity with one of the most profound questions about the nature of the Universe: What is dark energy and\u2026","rel":"","context":"In &quot;\u4e13\u95e8\u8ba8\u8bba\u5723\u7ecf\u4ee5\u53ca\u7cbe\u795e\u548c\u8eab\u4f53\u7684\u6587\u7ae0&quot;","block_context":{"text":"\u4e13\u95e8\u8ba8\u8bba\u5723\u7ecf\u4ee5\u53ca\u7cbe\u795e\u548c\u8eab\u4f53\u7684\u6587\u7ae0","link":"https:\/\/vkrastev1blog.com\/category\/%d1%81%d1%82%d0%b0%d1%82%d0%b8%d0%b8-%d0%bf%d0%be%d1%81%d0%b2%d0%b5%d1%82%d0%b5%d0%bd%d0%b8-%d0%bd%d0%b0-%d0%b1%d0%b8%d0%b1%d0%bb%d0%b8%d1%8f%d1%82%d0%b0-%d0%b8-%d0%b7%d0%b0-%d0%b4%d1%83%d1%85%d0%b0\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2026\/10\/xo6_pg-ni94xfas9mcsevoc5rsm-3ndbueqaerit8-kbwop9hmt9_pisdq8hdlb-iscvxzhcntdxkxck5rmvvbyo7dwh8pvxfpr-fbpaswu9q0dxfby1vdzsvp2jtvimtdk_izkfkdlzonebgctf0smxzzmu_nflb8z46tncnns81pr6hbzp7txac_.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2026\/10\/xo6_pg-ni94xfas9mcsevoc5rsm-3ndbueqaerit8-kbwop9hmt9_pisdq8hdlb-iscvxzhcntdxkxck5rmvvbyo7dwh8pvxfpr-fbpaswu9q0dxfby1vdzsvp2jtvimtdk_izkfkdlzonebgctf0smxzzmu_nflb8z46tncnns81pr6hbzp7txac_.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2026\/10\/xo6_pg-ni94xfas9mcsevoc5rsm-3ndbueqaerit8-kbwop9hmt9_pisdq8hdlb-iscvxzhcntdxkxck5rmvvbyo7dwh8pvxfpr-fbpaswu9q0dxfby1vdzsvp2jtvimtdk_izkfkdlzonebgctf0smxzzmu_nflb8z46tncnns81pr6hbzp7txac_.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2026\/10\/xo6_pg-ni94xfas9mcsevoc5rsm-3ndbueqaerit8-kbwop9hmt9_pisdq8hdlb-iscvxzhcntdxkxck5rmvvbyo7dwh8pvxfpr-fbpaswu9q0dxfby1vdzsvp2jtvimtdk_izkfkdlzonebgctf0smxzzmu_nflb8z46tncnns81pr6hbzp7txac_.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2026\/10\/xo6_pg-ni94xfas9mcsevoc5rsm-3ndbueqaerit8-kbwop9hmt9_pisdq8hdlb-iscvxzhcntdxkxck5rmvvbyo7dwh8pvxfpr-fbpaswu9q0dxfby1vdzsvp2jtvimtdk_izkfkdlzonebgctf0smxzzmu_nflb8z46tncnns81pr6hbzp7txac_.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2026\/10\/xo6_pg-ni94xfas9mcsevoc5rsm-3ndbueqaerit8-kbwop9hmt9_pisdq8hdlb-iscvxzhcntdxkxck5rmvvbyo7dwh8pvxfpr-fbpaswu9q0dxfby1vdzsvp2jtvimtdk_izkfkdlzonebgctf0smxzzmu_nflb8z46tncnns81pr6hbzp7txac_.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"jetpack_likes_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/posts\/31","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/users\/65283547"}],"replies":[{"embeddable":true,"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/comments?post=31"}],"version-history":[{"count":8,"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/posts\/31\/revisions"}],"predecessor-version":[{"id":42,"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/posts\/31\/revisions\/42"}],"wp:attachment":[{"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/media?parent=31"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/categories?post=31"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vkrastev1blog.com\/wp-json\/wp\/v2\/tags?post=31"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}