{"id":2308,"date":"2026-05-29T21:47:53","date_gmt":"2026-05-29T21:47:53","guid":{"rendered":"https:\/\/vkrastev1blog.com\/?p=2308"},"modified":"2026-05-29T21:48:41","modified_gmt":"2026-05-29T21:48:41","slug":"questions-and-informations-prepairing-for-java-developer-job-interview","status":"publish","type":"post","link":"https:\/\/vkrastev1blog.com\/2026\/05\/29\/questions-and-informations-prepairing-for-java-developer-job-interview\/","title":{"rendered":"Ot\u00e1zky a informace o p\u0159\u00edprav\u011b na pracovn\u00ed pohovor Java Developer"},"content":{"rendered":"\n

Jak\u00e9 jsou principy SOLID?<\/p>\n\n\n\n

Co je princip jednotn\u00e9 odpov\u011bdnosti (SRP):<\/p>\n\n\n\n

T\u0159\u00edda by m\u011bla m\u00edt pouze jednu odpov\u011bdnost.
Ke zm\u011bn\u011b by m\u011bl m\u00edt jedin\u00fd d\u016fvod.
Mezi v\u00fdhody pat\u0159\u00ed snadn\u011bj\u0161\u00ed testov\u00e1n\u00ed, ni\u017e\u0161\u00ed propojen\u00ed a lep\u0161\u00ed organizace.
P\u0159\u00edklad:<\/p>\n\n\n\n

J\u00e1va<\/p>\n\n\n\n

ve\u0159ejn\u00e1 t\u0159\u00edda Kniha {
private String name;
soukrom\u00fd autor \u0159et\u011bzce;
soukrom\u00fd text \u0159et\u011bzce;
\/\/ konstruktory, getry a nastavova\u010de
}<\/p>\n\n\n\n

Co je otev\u0159en\u00fd-uzav\u0159en\u00fd princip (OCP):<\/p>\n\n\n\n

Softwarov\u00e9 entity (t\u0159\u00eddy, moduly, funkce) by m\u011bly b\u00fdt otev\u0159en\u00e9 pro roz\u0161\u00ed\u0159en\u00ed, ale uzav\u0159en\u00e9 pro \u00fapravy.
Dos\u00e1hn\u011bte toho pomoc\u00ed rozhran\u00ed, abstraktn\u00edch t\u0159\u00edd a d\u011bdi\u010dnosti.
P\u0159\u00edklad:
J\u00e1va<\/p>\n\n\n\n

tvar rozhran\u00ed {
dvojit\u00e1 plocha();
}
class Circle implementuje Shape { \/* implementaci \/ } class Rectangle implements Shape { \/<\/em> implementace *\/ }<\/p>\n\n\n\n

Co je Liskov\u016fv substitu\u010dn\u00ed princip (LSP):<\/p>\n\n\n\n

Podtypy mus\u00ed b\u00fdt nahraditeln\u00e9 sv\u00fdmi z\u00e1kladn\u00edmi typy, ani\u017e by se zm\u011bnila spr\u00e1vnost programu.
N\u00e1sleduje vztah \u201eje-a\u201c.
P\u0159\u00edklad:
J\u00e1va<\/p>\n\n\n\n

class Bird { \/* b\u011b\u017en\u00e9 chov\u00e1n\u00ed pt\u00e1k\u016f \/ } class Vrabec roz\u0161i\u0159uje Pt\u00e1k { \/<\/em> specifick\u00e9 chov\u00e1n\u00ed vrabc\u016f *\/ }<\/p>\n\n\n\n

Co je princip segregace rozhran\u00ed (ISP):<\/p>\n\n\n\n

Klienti by nem\u011bli b\u00fdt nuceni z\u00e1viset na rozhran\u00edch, kter\u00e1 nepou\u017e\u00edvaj\u00ed.
Rozd\u011blte velk\u00e1 rozhran\u00ed na men\u0161\u00ed, konkr\u00e9tn\u011bj\u0161\u00ed.
P\u0159\u00edklad:
J\u00e1va<\/p>\n\n\n\n

interface Worker {
void work();
}
interface Eater {
void eat();
}
class Robot implementuje Worker { \/* implementace *\/ }<\/p>\n\n\n\n

Co je princip inverze z\u00e1vislosti (DIP):<\/p>\n\n\n\n

Moduly vysok\u00e9 \u00farovn\u011b by nem\u011bly z\u00e1viset na modulech n\u00edzk\u00e9 \u00farovn\u011b; oboj\u00ed by m\u011blo z\u00e1viset na abstrakc\u00edch.
Abstrakce by nem\u011bly z\u00e1viset na detailech; podrobnosti by m\u011bly z\u00e1viset na abstrakc\u00edch.<\/p>\n\n\n\n

\/\/ Abstrakce
interface MessageSender {
void sendMessage(String message);
}<\/p>\n\n\n\n

\/\/ Modul vysok\u00e9 \u00farovn\u011b
class NotificationService {
soukrom\u00fd MessageSender messageSender;<\/p>\n\n\n

\n\t
\n\t\t
\n\t\t\t\n
\n
public NotificationService(MessageSender messageSender) {<\/div>
    this.messageSender = messageSender;<\/div>
}<\/div>
<\/div>
public void send(String message) {<\/div>
    messageSender.sendMessage(message);<\/div>
}<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
}<\/p>\n\n\n\n
\/\/ N\u00edzko\u00farov\u0148ov\u00fd modul
class EmailSender implementuje MessageSender {
@P\u0159epsat
public void sendMessage(String message) {
System.out.println(“Odes\u00edl\u00e1n\u00ed e-mailu: ” + zpr\u00e1va);
}
}<\/p>\n\n\n\n
\/\/ Dal\u0161\u00ed n\u00edzko\u00farov\u0148ov\u00fd modul
class SmsSender implementuje MessageSender {
@P\u0159epsat
public void sendMessage(String message) {
System.out.println(“Odes\u00edl\u00e1n\u00ed SMS: ” + zpr\u00e1va);
}
}<\/p>\n\n\n\n
\/\/ Hlavn\u00ed t\u0159\u00edda
public class Hlavn\u00ed {
public static void main(String[] args) {
\/\/ Pou\u017eijte EmailSender
MessageSender emailSender = new EmailSender();
NotificationService notificationService1 = new NotificationService(emailSender);
notificationService1.send(“Dobr\u00fd den prost\u0159ednictv\u00edm e-mailu!”);<\/p>\n\n\n\n
    \/\/ Use SmsSender\n    MessageSender smsSender = new SmsSender();\n    NotificationService notificationService2 = new NotificationService(smsSender);\n    notificationService2.send("Hello via SMS!");\n}<\/code><\/pre>\n\n\n\n
}<\/p>\n\n\n\n
Rozhran\u00ed MessageSender slou\u017e\u00ed jako abstrakce.
Vysoko\u00farov\u0148ov\u00fd modul NotificationService z\u00e1vis\u00ed na t\u00e9to abstrakci nam\u00edsto konkr\u00e9tn\u00edch implementac\u00ed.
N\u00edzko\u00farov\u0148ov\u00e9 moduly jako EmailSender a SmsSender tak\u00e9 z\u00e1vis\u00ed na abstrakci implementac\u00ed rozhran\u00ed MessageSender.<\/p>\n\n\n\n
Co je normalizace SQL<\/p>\n\n\n\n
Co je normalizace?
Normalizace zahrnuje strukturov\u00e1n\u00ed dat v rela\u010dn\u00ed datab\u00e1zi, aby se odstranily anom\u00e1lie, jako je redundance.
Rozkl\u00e1d\u00e1 velk\u00e9, slo\u017eit\u00e9 tabulky na men\u0161\u00ed, p\u0159i\u010dem\u017e zachov\u00e1v\u00e1 datov\u00e9 vztahy.
Pro\u010d je normalizace d\u016fle\u017eit\u00e1?
Sni\u017euje redundanci: Rozd\u011blen\u00edm dat do men\u0161\u00edch tabulek se vyhneme ukl\u00e1d\u00e1n\u00ed stejn\u00fdch informac\u00ed v\u00edcekr\u00e1t.
Zlep\u0161uje v\u00fdkon dotaz\u016f: Men\u0161\u00ed normalizovan\u00e9 tabulky vedou k rychlej\u0161\u00edmu prov\u00e1d\u011bn\u00ed dotaz\u016f.
Minimalizuje anom\u00e1lie aktualizac\u00ed: Aktualizace lze prov\u00e1d\u011bt bez ovlivn\u011bn\u00ed ostatn\u00edch z\u00e1znam\u016f.
Zlep\u0161uje integritu dat: Zaji\u0161\u0165uje konzistentn\u00ed a p\u0159esn\u00e1 data.
Sc\u00e9n\u00e1\u0159e pro normalizaci:
Integrita dat: Zabra\u0148te nekonzistentnostem p\u0159i aktualizaci dat (nap\u0159. zm\u011bny v\u011bku z\u00e1kazn\u00edk\u016f).
Efektivn\u00ed dotazov\u00e1n\u00ed: Zjednodu\u0161te slo\u017eit\u00e9 dotazy rozd\u011blen\u00edm dat.
Optimalizace \u00falo\u017ei\u0161t\u011b: Odstra\u0148te zbyte\u010dnou redundanci, abyste u\u0161et\u0159ili m\u00edsto.<\/p>\n\n\n\n
Co je monolit Microservices?<\/p>\n\n\n\n
Co je monolit?<\/p>\n\n\n\n
Monolitick\u00e1 aplikace je postavena jako jeden jednotn\u00fd celek. Pevn\u011b \u200b\u200bspojuje v\u0161echny komponenty (jako je u\u017eivatelsk\u00e9 u\u017eivatelsk\u00e9 rozhran\u00ed na stran\u011b klienta, datab\u00e1ze a aplikace na stran\u011b serveru) do jedn\u00e9 k\u00f3dov\u00e9 b\u00e1ze.
v\u00fdhody:
Snadn\u00e9 nasazen\u00ed: Vzhledem k tomu, \u017ee se jedn\u00e1 o jeden spustiteln\u00fd soubor nebo adres\u00e1\u0159, je nasazen\u00ed p\u0159\u00edmo\u010dar\u00e9.
Rychlost v\u00fdvoje: Na za\u010d\u00e1tku \u017eivota projektu umo\u017e\u0148uj\u00ed monolity rychl\u00fd v\u00fdvoj d\u00edky sv\u00e9 jednoduchosti.
V\u00fdkon: Centralizovan\u00fd k\u00f3d zvl\u00e1dne r\u016fzn\u00e9 funkce.<\/p>\n\n\n\n
Co jsou mikroslu\u017eby?<\/p>\n\n\n\n
Mikroslu\u017eby rozd\u011bluj\u00ed aplikaci na men\u0161\u00ed, nez\u00e1visle nasaditeln\u00e9 slu\u017eby. Ka\u017ed\u00e1 slu\u017eba se zam\u011b\u0159uje na ur\u010ditou obchodn\u00ed dom\u00e9nu.
v\u00fdhody:
\u0160k\u00e1lovatelnost: Mikroslu\u017eby umo\u017e\u0148uj\u00ed nez\u00e1visl\u00e9 \u0161k\u00e1lov\u00e1n\u00ed jednotliv\u00fdch komponent.
Flexibilita: V\u00fdvoj\u00e1\u0159i si mohou pro ka\u017edou slu\u017ebu vybrat r\u016fzn\u00e9 technologie.
Izolace: Selh\u00e1n\u00ed jedn\u00e9 slu\u017eby neovlivn\u00ed ostatn\u00ed.
v\u00fdzvy:
Slo\u017eitost: Spr\u00e1va v\u00edce slu\u017eeb vy\u017eaduje robustn\u00ed orchestraci.
S\u00ed\u0165ov\u00e1 re\u017eie: Komunikace mezi slu\u017ebami zav\u00e1d\u00ed latenci.
Slo\u017eitost nasazen\u00ed: Koordinace aktualizac\u00ed nap\u0159\u00ed\u010d slu\u017ebami m\u016f\u017ee b\u00fdt slo\u017eit\u00e1.<\/p>\n\n\n\n
Co je polymorfismus?<\/p>\n\n\n\n
P\u0159eps\u00e1n\u00ed metody:
Kdy\u017e podt\u0159\u00edda poskytuje specifickou implementaci pro metodu, kter\u00e1 je ji\u017e definov\u00e1na v jej\u00ed nadt\u0159\u00edd\u011b.<\/p>\n\n\n\n
P\u0159et\u00ed\u017een\u00ed metody:
Kdy\u017e m\u00e1 t\u0159\u00edda v\u00edce metod se stejn\u00fdm n\u00e1zvem, ale r\u016fzn\u00fdmi parametry (r\u016fzn\u00fd po\u010det nebo typy argument\u016f).<\/p>\n\n\n\n
Co pou\u017e\u00edvaj\u00ed soukrom\u00ed konstrukt\u00e9\u0159i?<\/p>\n\n\n\n
–Soukrom\u00e9 konstruktory se pou\u017e\u00edvaj\u00ed v pomocn\u00fdch t\u0159\u00edd\u00e1ch nebo konstantn\u00edch t\u0159\u00edd\u00e1ch.
Tyto t\u0159\u00eddy obsahuj\u00ed pouze statick\u00e9 metody nebo \u010dleny.<\/p>\n\n\n\n
–Vyh\u00fdb\u00e1n\u00ed se podt\u0159\u00edd\u011bn\u00ed<\/p>\n\n\n\n
— Delegace konstrukt\u00e9ra:
Soukrom\u00e9 konstruktory umo\u017e\u0148uj\u00ed delegov\u00e1n\u00ed konstruktor\u016f, kde konkr\u00e9tn\u00ed konstruktory volaj\u00ed spole\u010dn\u00fd soukrom\u00fd konstruktor.<\/p>\n\n\n\n
— Singleton vzor<\/p>\n\n\n\n
O JVM<\/p>\n\n\n\n
–Sestaven\u00ed:
Kdy\u017e kompilujete soubor .java, kompil\u00e1tor Java vygeneruje soubory .class obsahuj\u00edc\u00ed bajtov\u00fd k\u00f3d (p\u0159echodn\u00e1 reprezentace).
Bytecode je nez\u00e1visl\u00fd na platform\u011b a m\u016f\u017ee b\u011b\u017eet na jak\u00e9mkoli syst\u00e9mu s kompatibiln\u00edm JVM.
–Podsyst\u00e9m Class Loader:
Zodpov\u011bdn\u00fd za na\u010d\u00edt\u00e1n\u00ed t\u0159\u00edd do pam\u011bti.
\u010cte soubory .class, generuje bin\u00e1rn\u00ed data a ukl\u00e1d\u00e1 je do oblasti metod.
Vytvo\u0159\u00ed objekt Class p\u0159edstavuj\u00edc\u00ed na\u010dtenou t\u0159\u00eddu v pam\u011bti haldy.
P\u0159\u00edklad: Student s1 = new Student(); T\u0159\u00edda c1 = s1.getClass();
–Propojen\u00ed:
Skl\u00e1d\u00e1 se ze t\u0159\u00ed krok\u016f:
Ov\u011b\u0159en\u00ed: Zaji\u0161\u0165uje spr\u00e1vnost souboru .class.
P\u0159\u00edprava: Alokuje pam\u011b\u0165 pro prom\u011bnn\u00e9 t\u0159\u00eddy a inicializuje je.
Rozli\u0161en\u00ed (voliteln\u00e9): Vy\u0159e\u0161\u00ed symbolick\u00e9 odkazy na jin\u00e9 t\u0159\u00eddy nebo metody.
–Inicializace:
Spou\u0161t\u00ed statick\u00e9 inicializ\u00e1tory (nap\u0159. statick\u00e9 bloky) a inicializuje statick\u00e9 prom\u011bnn\u00e9.
Prom\u011bnn\u00e9 instance se inicializuj\u00ed p\u0159i vytvo\u0159en\u00ed objektu.
–Prov\u00e1d\u011bc\u00ed engine:
P\u0159ev\u00e1d\u00ed bajtk\u00f3d na strojov\u00fd k\u00f3d.
Zahrnuje kompilaci Just-In-Time (JIT) pro optimalizaci v\u00fdkonu.<\/p>\n\n\n\n
— Stru\u010dn\u011b \u0159e\u010deno, JVM umo\u017e\u0148uje program\u016fm Java spou\u0161t\u011bt kdekoli pomoc\u00ed interpretace bajtov\u00e9ho k\u00f3du a spr\u00e1vy pam\u011bti<\/p>\n\n\n\n
Co je Privat abstraktn\u00ed metoda?<\/p>\n\n\n\n
–P\u0159\u00edpady pou\u017eit\u00ed pro soukrom\u00e9 metody v abstraktn\u00edch t\u0159\u00edd\u00e1ch:
Zat\u00edmco abstraktn\u00ed metody nemohou b\u00fdt soukrom\u00e9, m\u016f\u017eete soukrom\u00e9 metody v r\u00e1mci abstraktn\u00ed t\u0159\u00eddy pou\u017e\u00edt pro r\u016fzn\u00e9 \u00fa\u010dely:
–Pomocn\u00e9 metody: Implementujte b\u011b\u017en\u00e9 funkce sd\u00edlen\u00e9 jin\u00fdmi metodami.
–Encapsulation: Skryt\u00ed podrobnost\u00ed implementace z podt\u0159\u00edd.
–T\u0159\u00eddy podobn\u00e9 struktur\u00e1m: Vytv\u00e1\u0159ejte mal\u00e9 t\u0159\u00eddy se soukrom\u00fdmi metodami, kter\u00e9 slou\u017e\u00ed jako datov\u00e9 kontejnery<\/p>\n\n\n\n
Co je to Garbage collector?<\/p>\n\n\n\n
–Hromadn\u00e1 pam\u011b\u0165:
Objekty Java jsou vytv\u00e1\u0159eny v hald\u011b, vyhrazen\u00e9 oblasti pam\u011bti.
N\u011bkter\u00e9 objekty se stanou nedosa\u017eiteln\u00fdmi (ji\u017e na n\u011b program neodkazuje).
–Garbage Collector (GC):
GC identifikuje a odstran\u00ed nepou\u017e\u00edvan\u00e9 objekty, aby uvolnil pam\u011b\u0165.
Spou\u0161t\u00ed se automaticky na pozad\u00ed.
Dva typy:
Minor GC: Odstra\u0148uje nedosa\u017eiteln\u00e9 p\u0159edm\u011bty u mlad\u00e9 generace.
Major GC (Full GC): Vyma\u017ee objekty star\u00e9 generace.
–V\u00fdhody:
V\u00fdvoj\u00e1\u0159i nemus\u00ed objekty explicitn\u011b odstra\u0148ovat.
GC zaji\u0161\u0165uje dostupnost pam\u011bti a zabra\u0148uje chyb\u00e1m OutOfMemoryErrors<\/p>\n\n\n\n
Co je OOP?<\/p>\n\n\n\n
\u010cty\u0159i principy OOP:
–Zapouzd\u0159en\u00ed: Sdru\u017eov\u00e1n\u00ed dat (atribut\u016f) a metod (funkc\u00ed) dohromady v r\u00e1mci t\u0159\u00eddy za \u00fa\u010delem skryt\u00ed podrobnost\u00ed implementace a poskytnut\u00ed \u010dist\u00e9ho rozhran\u00ed.
— D\u011bdi\u010dnost: Vytv\u00e1\u0159en\u00ed nov\u00fdch t\u0159\u00edd na z\u00e1klad\u011b st\u00e1vaj\u00edc\u00edch, zd\u011bd\u011bn\u00ed jejich atribut\u016f a chov\u00e1n\u00ed. Podporuje op\u011btovn\u00e9 pou\u017eit\u00ed k\u00f3du.
–Polymorfismus: Umo\u017e\u0148uje jednotn\u00e9 zach\u00e1zen\u00ed s objekty r\u016fzn\u00fdch t\u0159\u00edd prost\u0159ednictv\u00edm spole\u010dn\u00e9ho rozhran\u00ed. Umo\u017e\u0148uje flexibilitu a roz\u0161i\u0159itelnost.
–Abstrakce: Zam\u011b\u0159en\u00ed na z\u00e1kladn\u00ed funkce a skryt\u00ed zbyte\u010dn\u00fdch slo\u017eitost\u00ed. Abstrakce zjednodu\u0161uje design a \u010din\u00ed jej l\u00e9pe ovladateln\u00fdm.<\/p>\n\n\n\n
Co je ACID vlastnosti hraj\u00ed z\u00e1sadn\u00ed roli p\u0159i zaji\u0161\u0165ov\u00e1n\u00ed spolehlivosti a konzistence transakc\u00ed.<\/p>\n\n\n\n
— Atomicita:
Transakce jsou bu\u010f provedeny \u00fapln\u011b, nebo v\u016fbec.
\u017d\u00e1dn\u00e9 \u010d\u00e1ste\u010dn\u00e9 proveden\u00ed: Pokud transakce sel\u017ee uprost\u0159ed, budou v\u0161echny zm\u011bny proveden\u00e9 v datab\u00e1zi vr\u00e1ceny zp\u011bt.
P\u0159\u00edklad: Zva\u017ete p\u0159evod 100 USD z \u00fa\u010dtu X na \u00fa\u010det Y. Pokud transakce sel\u017ee po ode\u010dten\u00ed z X, ale p\u0159ed p\u0159id\u00e1n\u00edm na Y, datab\u00e1ze z\u016fstane konzistentn\u00ed.
–Konzistence:
Datab\u00e1ze mus\u00ed udr\u017eovat omezen\u00ed integrity p\u0159ed a po transakci.
P\u0159\u00edklad: Pokud je celkov\u00e1 \u010d\u00e1stka p\u0159ed transakc\u00ed 700 USD (X: 500 USD, Y: 200 USD), m\u011bla by po transakci z\u016fstat stejn\u00e1 (X: 400 USD, Y: 300 USD).
–Izolace:
V\u00edce transakc\u00ed m\u016f\u017ee prob\u00edhat sou\u010dasn\u011b, ani\u017e by se navz\u00e1jem ovliv\u0148ovaly.
Zm\u011bny proveden\u00e9 jednou transakc\u00ed nejsou viditeln\u00e9 pro ostatn\u00ed, dokud nejsou potvrzeny.
Zaji\u0161\u0165uje ekvivalentn\u00ed v\u00fdsledky, jako kdyby byly transakce prov\u00e1d\u011bny s\u00e9riov\u011b.
P\u0159\u00edklad: Izolace transakc\u00ed zabra\u0148uje nekonzistenc\u00edm zp\u016fsoben\u00fdm prokl\u00e1dan\u00fdmi operacemi.
–Trvanlivost:
Jakmile je transakce potvrzena, jej\u00ed zm\u011bny jsou trval\u00e9.
P\u0159e\u017eije selh\u00e1n\u00ed nebo p\u00e1dy syst\u00e9mu.
Zaji\u0161\u0165uje st\u00e1lost dat.
P\u0159\u00edklad: I po restartu syst\u00e9mu z\u016fstanou potvrzen\u00e9 zm\u011bny nedot\u010deny.
Pamatujte, \u017ee vlastnosti ACID poskytuj\u00ed z\u00e1klad pro spolehliv\u00e9 a konzistentn\u00ed datab\u00e1zov\u00e9 operace! \ud83c\udf1f<\/p>\n\n\n\n
Co je vzorec strategie?
Popis: Definuje rodinu algoritm\u016f, ka\u017ed\u00fd z nich zapouzd\u0159uje a \u010din\u00ed je vz\u00e1jemn\u011b zam\u011bniteln\u00fdmi. Umo\u017e\u0148uje algoritmu m\u011bnit se nez\u00e1visle na klientech, kte\u0159\u00ed je pou\u017e\u00edvaj\u00ed.
P\u0159\u00edklad:
J\u00e1va<\/p>\n\n\n\n
\/\/ Rozhran\u00ed pro chov\u00e1n\u00ed p\u0159i j\u00eddle
interface EatBehavior {
void eat();
}<\/p>\n\n\n\n
\/\/ Konkr\u00e9tn\u00ed implementace stravovac\u00edho chov\u00e1n\u00ed
class NormalDiet implementuje EatBehavior {
@P\u0159epsat
public void eat() {
\/\/ Norm\u00e1ln\u00ed j\u00eddlo
}
}<\/p>\n\n\n\n
class LosingWeightDiet implementuje EatBehavior {
@P\u0159epsat
public void eat() {
\/\/ Zdrav\u00e9 j\u00eddlo
}
}<\/p>\n\n\n\n
\/\/ T\u0159\u00edda ko\u010dky s chov\u00e1n\u00edm p\u0159i j\u00eddle
abstraktn\u00ed t\u0159\u00edda Cat {
EatBehaviour eatBehavior;<\/p>\n\n\n
\n\t
\n\t\t
\n\t\t\t\n
\n
public void eat() {<\/div>
    eatBehavior.eat();<\/div>
}<\/div>
<\/div>
public void setEatBehavior(EatBehavior eatBehavior) {<\/div>
 this.eatBehavior = eatBehavior;<\/div>
}<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
}<\/p>\n\n\n\n
\/\/ Pou\u017eit\u00ed
Ko\u010dka ko\u010dka = nov\u00e1 Ko\u010dka();
cat.setEatBehavior(new LosingWeightDiet());
cat.eat(); \/\/ Ko\u010dka j\u00ed se zdrav\u011bj\u0161\u00ed stravou<\/p>\n\n\n\n
Kreativn\u00ed vzory:
Tyto vzory se zam\u011b\u0159uj\u00ed na konkretizaci t\u0159\u00eddy.
P\u0159\u00edklady zahrnut\u00e9<\/p>\n\n\n\n
— tov\u00e1rn\u00ed metoda,
Prohl\u00e1\u0161en\u00ed o probl\u00e9mu: P\u0159edpokl\u00e1dejme, \u017ee chceme vytv\u00e1\u0159et r\u016fzn\u00e9 typy produkt\u016f (nap\u0159. auta, kola, j\u00edzdn\u00ed kola), ani\u017e bychom \u00fazce propojovali n\u00e1\u0161 k\u00f3d s konkr\u00e9tn\u00edmi implementacemi.
Kl\u00ed\u010dov\u00e9 komponenty:
Produkt: Abstraktn\u00ed t\u0159\u00edda nebo rozhran\u00ed definuj\u00edc\u00ed b\u011b\u017en\u00e9 operace pro objekty, kter\u00e9 tov\u00e1rna vytvo\u0159\u00ed.
Konkr\u00e9tn\u00ed produkty: Aktu\u00e1ln\u00ed t\u0159\u00eddy implementuj\u00edc\u00ed rozhran\u00ed produktu, p\u0159edstavuj\u00edc\u00ed konkr\u00e9tn\u00ed typy objekt\u016f.
Creator: Abstraktn\u00ed t\u0159\u00edda nebo rozhran\u00ed deklaruj\u00edc\u00ed tov\u00e1rn\u00ed metodu. Je zodpov\u011bdn\u00fd za vytv\u00e1\u0159en\u00ed objekt\u016f Product, ale deleguje skute\u010dn\u00e9 vytv\u00e1\u0159en\u00ed na podt\u0159\u00eddy.
Concrete Creators: Podt\u0159\u00eddy Creator, kter\u00e9 implementuj\u00ed tov\u00e1rn\u00ed metodu. Rozhoduj\u00ed, kter\u00fd konkr\u00e9tn\u00ed betonov\u00fd v\u00fdrobek vytvo\u0159it, na z\u00e1klad\u011b vstupn\u00edch parametr\u016f nebo konfigurace.
Tov\u00e1rn\u00ed metoda: Metoda definovan\u00e1 ve t\u0159\u00edd\u011b Creator, kter\u00e1 vytv\u00e1\u0159\u00ed objekty Product. Obvykle je deklarov\u00e1n jako abstraktn\u00ed v Creator a implementov\u00e1n v Concrete Creators.
P\u0159\u00edklad v Jav\u011b: \u0158ekn\u011bme, \u017ee m\u00e1me tov\u00e1rnu, kter\u00e1 vyr\u00e1b\u00ed r\u016fzn\u00e9 typy vozidel. Zde je zjednodu\u0161en\u00fd p\u0159\u00edklad:
J\u00e1va<\/p>\n\n\n\n
\/\/ Abstraktn\u00ed produkt
rozhran\u00ed Produkt {
void display();
}<\/p>\n\n\n\n
\/\/ Betonov\u00e9 v\u00fdrobky
t\u0159\u00edda N\u00e1\u0159ad\u00ed pro automobily Produkt {
public void display() {
System.out.println(“Auto vytvo\u0159eno”);
}
}<\/p>\n\n\n\n
t\u0159\u00edda N\u00e1\u0159ad\u00ed na kolo Produkt {
public void display() {
System.out.println(“Kolo vytvo\u0159eno”);
}
}<\/p>\n\n\n\n
\/\/ Tv\u016frce (tov\u00e1rna)
interface Factory {
Product factoryMethod();
}<\/p>\n\n\n\n
\/\/ Tv\u016frci betonu
class ConcreteFactoryA implementuje Factory {
public Product factoryMethod() {
vr\u00e1tit nov\u00e9 auto();
}
}<\/p>\n\n\n\n
class ConcreteFactoryB implementuje Factory {
public Product factoryMethod() {
return new Bike();
}
}<\/p>\n\n\n\n
public class FactoryMethodExample {
public static void main(String[] args) {
Factory factoryA = new ConcreteFactoryA();
Produkt produktA = factoryA.factoryMethod();
produktA.display();<\/p>\n\n\n\n
    Factory factoryB = new ConcreteFactoryB();\n    Product productB = factoryB.factoryMethod();\n    productB.display();\n}<\/code><\/pre>\n\n\n\n
}<\/p>\n\n\n\n
— Stavitel
Builder Pattern je kreativn\u00ed n\u00e1vrhov\u00fd vzor, \u200b\u200bkter\u00fd v\u00e1m umo\u017e\u0148uje vytv\u00e1\u0159et slo\u017eit\u00e9 objekty krok za krokem,
odd\u011bluj\u00edc\u00ed jejich konstrukci od jejich reprezentace. Zde je jednoduch\u00fd p\u0159\u00edklad v Jav\u011b:
\/\/ Definujte t\u0159\u00eddu, kterou chcete sestavit
t\u0159\u00edda p\u0159\u00edsp\u011bvek {
soukrom\u00fd z\u00e1v\u011bre\u010dn\u00fd n\u00e1zev \u0159et\u011bzce;
soukrom\u00fd kone\u010dn\u00fd Text \u0159et\u011bzce;
soukrom\u00e9 fin\u00e1le Stringov\u00e1 kategorie;<\/p>\n\n\n
\n\t
\n\t\t
\n\t\t\t\n
\n
Post(Builder builder) {<\/div>
    this.title = builder.title;<\/div>
    this.text = builder.text;<\/div>
    this.category = builder.category;<\/div>
}<\/div>
<\/div>
\/\/ Getters for properties<\/div>
public String getTitle() {<\/div>
    return title;<\/div>
}<\/div>
<\/div>
public String getText() {<\/div>
    return text;<\/div>
}<\/div>
<\/div>
public String getCategory() {<\/div>
    return category;<\/div>
}<\/div>
<\/div>
\/\/ Builder class<\/div>
public static class Builder {<\/div>
    private String title;<\/div>
    private String text;<\/div>
    private String category;<\/div>
<\/div>
    public Builder title(String title) {<\/div>
        this.title = title;<\/div>
        return this;<\/div>
    }<\/div>
<\/div>
    public Builder text(String text) {<\/div>
        this.text = text;<\/div>
        return this;<\/div>
    }<\/div>
<\/div>
    public Builder category(String category) {<\/div>
        this.category = category;<\/div>
        return this;<\/div>
    }<\/div>
<\/div>
    public Post build() {<\/div>
        return new Post(this);<\/div>
    }<\/div>
}<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
}<\/p>\n\n\n\n
\/\/ Pou\u017eit\u00ed
public class Hlavn\u00ed {
public static void main(String[] args) {
Post post = new Post.Builder()
.title(“Vzor Java Builder”)
.text(“Vysv\u011btlen\u00ed, jak implementovat Builder Pattern v Jav\u011b”)
.category(“N\u00e1vrhov\u00e9 vzory”)
.vytvo\u0159it();<\/p>\n\n\n\n
    System.out.println("Title: " + post.getTitle());\n    System.out.println("Text: " + post.getText());\n    System.out.println("Category: " + post.getCategory());\n}<\/code><\/pre>\n\n\n\n
}<\/p>\n\n\n\n
–Prototyp
Vzor prototypu je kreativn\u00ed n\u00e1vrhov\u00fd vzor, \u200b\u200bkter\u00fd v\u00e1m umo\u017e\u0148uje vytv\u00e1\u0159et nov\u00e9 objekty zkop\u00edrov\u00e1n\u00edm existuj\u00edc\u00edho objektu.
M\u00edsto vytv\u00e1\u0159en\u00ed nov\u00fdch instanc\u00ed od za\u010d\u00e1tku klonujete existuj\u00edc\u00ed prototyp, kter\u00fd m\u016f\u017ee b\u00fdt efektivn\u011bj\u0161\u00ed a flexibiln\u011bj\u0161\u00ed. Poj\u010fme se pono\u0159it do p\u0159\u00edkladu v Jav\u011b:
Definujte rozhran\u00ed prototypu: Nejprve vytvo\u0159\u00edme abstraktn\u00ed t\u0159\u00eddu nebo rozhran\u00ed nazvan\u00e9 Tree s abstraktn\u00ed metodou copy():
J\u00e1va<\/p>\n\n\n\n
public abstract class strom {
public abstract Tree copy();
}<\/p>\n\n\n\n
Betonov\u00e9 prototypy: D\u00e1le implementujeme dv\u011b betonov\u00e9 t\u0159\u00eddy, kter\u00e9 roz\u0161i\u0159uj\u00ed Tree: PlasticTree a PineTree. Tyto t\u0159\u00eddy p\u0159edstavuj\u00ed specifick\u00e9 typy strom\u016f a poskytuj\u00ed vlastn\u00ed implementaci metody copy():
J\u00e1va<\/p>\n\n\n\n
public class PlasticTree extends Tree {
@P\u0159epsat
public Tree copy() {
PlasticTree plasticTreeClone = new PlasticTree(this.getMass(), this.getHeight());
plasticTreeClone.setPosition(this.getPosition());
n\u00e1vrat plastTreeClone;
}
}<\/p>\n\n\n\n
public class PineTree roz\u0161i\u0159uje strom {
@P\u0159epsat
public Tree copy() {
PineTree pineTreeClone = new PineTree(this.getMass(), this.getHeight());
pineTreeClone.setPosition(this.getPosition());
n\u00e1vrat pineTreeClone;
}
}
V t\u011bchto t\u0159\u00edd\u00e1ch p\u0159izp\u016fsobujeme proces klonov\u00e1n\u00ed na z\u00e1klad\u011b konkr\u00e9tn\u00edho typu stromu. Nap\u0159\u00edklad zkop\u00edrujeme hmotnost, v\u00fd\u0161ku a polohu p\u016fvodn\u00edho stromu.
Pou\u017eit\u00ed: Nyn\u00ed vytvo\u0159\u00edme instance na\u0161ich konkr\u00e9tn\u00edch prototyp\u016f:
J\u00e1va<\/p>\n\n\n\n
public class Hlavn\u00ed {
public static void main(String[] args) {
P\u016fvodn\u00ed stromPlasticTree = nov\u00fd Plastov\u00fdStrom(10, 5);
Strom klonovan\u00fdPlasticTree = originalPlasticTree.copy();<\/p>\n\n\n\n
    Tree originalPineTree = new PineTree(15, 8);\n    Tree clonedPineTree = originalPineTree.copy();\n\n    \/\/ Use the cloned trees as needed\n    \/\/ ...\n}<\/code><\/pre>\n\n\n\n
}<\/p>\n\n\n\n
Co jsou to struktur\u00e1ln\u00ed vzory?
Tyto vzory se zab\u00fdvaj\u00ed strukturou a slo\u017een\u00edm t\u0159\u00eddy.<\/p>\n\n\n\n
— Vzor adapt\u00e9ru
Vzor adapt\u00e9ru je strukturn\u00ed n\u00e1vrhov\u00fd vzor, \u200b\u200bkter\u00fd umo\u017e\u0148uje, aby dv\u011b nekompatibiln\u00ed rozhran\u00ed spolupracovala.
Funguje jako most mezi t\u011bmito rozhran\u00edmi a umo\u017e\u0148uje spolupr\u00e1ci bez \u00fapravy jejich zdrojov\u00e9ho k\u00f3du.<\/p>\n\n\n\n
Objektov\u00fd adapt\u00e9r:
V tomto p\u0159\u00edstupu pou\u017e\u00edv\u00e1me kompozici k delegov\u00e1n\u00ed logiky na adapt\u00e9r.
Adapt\u00e9r obsahuje Adaptee a deleguje metodu request() na specificRequest() metodu v Adaptee.
J\u00e1va<\/p>\n\n\n\n
\/\/ Adaptee (existuj\u00edc\u00ed t\u0159\u00edda)
class Adaptee {
void SpecificRequest() {
System.out.println(“Specifick\u00fd po\u017eadavek p\u0159\u00edjemce”);
}
}<\/p>\n\n\n\n
\/\/ C\u00edlov\u00e9 rozhran\u00ed
rozhran\u00ed c\u00edl {
void request();
}<\/p>\n\n\n\n
\/\/ Adapt\u00e9r (pomoc\u00ed kompozice)
class Adapter implementuje c\u00edl {
soukrom\u00fd kone\u010dn\u00fd Adaptee adaptee;<\/p>\n\n\n
\n\t
\n\t\t
\n\t\t\t\n
\n
Adapter(Adaptee adaptee) {<\/div>
    this.adaptee = adaptee;<\/div>
}<\/div>
<\/div>
@Override<\/div>
public void request() {<\/div>
    adaptee.specificRequest();<\/div>
}<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
}<\/p>\n\n\n\n
ClassAdapter:
Vy\u017eaduje v\u00edcen\u00e1sobnou d\u011bdi\u010dnost (v Jav\u011b nen\u00ed p\u0159\u00edmo mo\u017en\u00e9).
M\u016f\u017eeme toho dos\u00e1hnout pomoc\u00ed rozhran\u00ed s v\u00fdchoz\u00edmi metodami.
Adapt\u00e9r roz\u0161i\u0159uje t\u0159\u00eddy Target i Adaptee.
J\u00e1va<\/p>\n\n\n\n
\/\/ C\u00edlov\u00e9 rozhran\u00ed
rozhran\u00ed c\u00edl {
void request();
}<\/p>\n\n\n\n
\/\/ Adaptee (existuj\u00edc\u00ed t\u0159\u00edda)
class Adaptee {
void SpecificRequest() {
System.out.println(“Specifick\u00fd po\u017eadavek p\u0159\u00edjemce”);
}
}<\/p>\n\n\n\n
\/\/ Adapt\u00e9r (pomoc\u00ed d\u011bdi\u010dnosti t\u0159\u00eddy)
class Adapter extends Adaptee implements Target {
@P\u0159epsat
public void request() {
zadan\u00fdPo\u017eadavek();
}
}
V\u00fdhody a kompromisy:
Class Adapter funguje dob\u0159e pro mapov\u00e1n\u00ed metody jedna ku jedn\u00e9.
Objektov\u00fd adapt\u00e9r poskytuje v\u011bt\u0161\u00ed flexibilitu a zabra\u0148uje \u00faprav\u00e1m k\u00f3du.<\/p>\n\n\n\n
–Dekorat\u00e9rsk\u00fd vzor
Decorator Pattern je kreativn\u00ed n\u00e1vrhov\u00fd vzor, \u200b\u200bkter\u00fd umo\u017e\u0148uje dynamicky p\u0159id\u00e1vat funk\u010dnost a chov\u00e1n\u00ed objektu bez
ovliv\u0148uj\u00edc\u00ed chov\u00e1n\u00ed jin\u00fdch existuj\u00edc\u00edch objekt\u016f v r\u00e1mci stejn\u00e9 t\u0159\u00eddy. Je to zvl\u00e1\u0161t\u011b u\u017eite\u010dn\u00e9, kdy\u017e chcete roz\u0161\u00ed\u0159it objekt
schopnosti, ani\u017e by se zm\u011bnila jeho struktura.<\/p>\n\n\n\n
P\u0159ehled:
Vzor Decorator poskytuje vylep\u0161en\u00e9 rozhran\u00ed k p\u016fvodn\u00edmu objektu t\u00edm, \u017ee jej obaluje dal\u0161\u00edmi funkcemi.
Up\u0159ednost\u0148ujeme slo\u017een\u00ed p\u0159ed d\u011bdi\u010dnost\u00ed, abychom sn\u00ed\u017eili re\u017eii podt\u0159\u00eddy.
Dekor\u00e1tory lze p\u0159id\u00e1vat za b\u011bhu, co\u017e umo\u017e\u0148uje flexibilitu.
P\u0159\u00edklad sc\u00e9n\u00e1\u0159e: P\u0159edpokl\u00e1dejme, \u017ee m\u00e1me objekt v\u00e1no\u010dn\u00edho stromku a chceme jej ozdobit r\u016fzn\u00fdmi p\u0159edm\u011bty, jako je girlanda, pozl\u00e1tko a bublinkov\u00e1 sv\u011btla. Budeme se \u0159\u00eddit p\u016fvodn\u00edmi designov\u00fdmi konvencemi Gang of Four:
Implementace:
Nejprve vytvo\u0159te rozhran\u00ed ChristmasTree:
J\u00e1va<\/p>\n\n\n\n
ve\u0159ejn\u00e9 rozhran\u00ed V\u00e1no\u010dn\u00ed strom {
String decor();
}<\/p>\n\n\n\n
Implementujte rozhran\u00ed se z\u00e1kladn\u00edm stromem:
J\u00e1va<\/p>\n\n\n\n
public class ChristmasTreeImpl implementuje ChristmasTree {
@P\u0159epsat
public String decor() {
n\u00e1vrat “v\u00e1no\u010dn\u00ed strom”;
}
}<\/p>\n\n\n\n
D\u00e1le vytvo\u0159te abstraktn\u00ed t\u0159\u00eddu TreeDecorator, kter\u00e1 implementuje ChristmasTree a dr\u017e\u00ed ozdoben\u00fd strom:
J\u00e1va<\/p>\n\n\n\n
public abstract class TreeDecorator implementuje ChristmasTree {
soukrom\u00fd z\u00e1v\u011bre\u010dn\u00fd v\u00e1no\u010dn\u00ed strome\u010dek;<\/p>\n\n\n
\n\t
\n\t\t
\n\t\t\t\n
\n
public TreeDecorator(ChristmasTree tree) {<\/div>
    this.tree = tree;<\/div>
}<\/div>
<\/div>
@Override<\/div>
public String decorate() {<\/div>
    return tree.decorate();<\/div>
}<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
}<\/p>\n\n\n\n
Nyn\u00ed vytvo\u0159te konkr\u00e9tn\u00ed dekor\u00e1tory. Nap\u0159\u00edklad BubbleLights:
J\u00e1va<\/p>\n\n\n\n
public class BubbleLights roz\u0161i\u0159uje TreeDecorator {
public BubbleLights(v\u00e1no\u010dn\u00ed strome\u010dek) {
super(strom);
}<\/p>\n\n\n
\n\t
\n\t\t
\n\t\t\t\n
\n
@Override<\/div>
public String decorate() {<\/div>
    return super.decorate() + " with Bubble Lights";<\/div>
}<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
}<\/p>\n\n\n\n
public class Garland roz\u0161i\u0159uje TreeDecorator {
public Garland(v\u00e1no\u010dn\u00ed strome\u010dek) {
super(strom);
}<\/p>\n\n\n
\n\t
\n\t\t
\n\t\t\t\n
\n
@Override<\/div>
public String decorate() {<\/div>
    return super.decorate() + " with Garland";<\/div>
}<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
}
Pou\u017e\u00edv\u00e1n\u00ed:
Vytvo\u0159te ozdoben\u00e9 stromky:
J\u00e1va<\/p>\n\n\n\n
public class DecoratorPatternDemo {
public static void main(String[] args) {
ChristmasStree tree1 = new Garland(new ChristmasTreeImpl());
System.out.println(tree1.decorate()); \/\/ V\u00fdstup: “V\u00e1no\u010dn\u00ed strom s girlandou”<\/p>\n\n\n\n
    ChristmasTree tree2 = new BubbleLights(new Garland(new Garland(new ChristmasTreeImpl())));\n    System.out.println(tree2.decorate()); \/\/ Output: "Christmas tree with Garland with Garland with Bubble Lights"\n}<\/code><\/pre>\n\n\n\n
}
Vzor umo\u017e\u0148uje p\u0159id\u00e1vat dekor\u00e1tory za b\u011bhu, co\u017e poskytuje flexibilitu p\u0159i zdoben\u00ed podle pot\u0159eby.
Pamatujte, \u017ee vzor dekorat\u00e9r\u016f se \u0161iroce pou\u017e\u00edv\u00e1 ve sc\u00e9n\u00e1\u0159\u00edch, kde chcete vylep\u0161it chov\u00e1n\u00ed objektu bez \u00fapravy jeho z\u00e1kladn\u00ed struktury.<\/p>\n\n\n\n
— Vzor fas\u00e1dy
Fas\u00e1dn\u00ed vzor je strukturn\u00ed n\u00e1vrhov\u00fd vzor, \u200b\u200bkter\u00fd zjednodu\u0161uje interakci se slo\u017eit\u00fdm subsyst\u00e9mem t\u00edm, \u017ee poskytuje jednotn\u00e9 rozhran\u00ed.
Funguje jako \u201evstupn\u00ed dve\u0159e\u201c, kter\u00e9 skr\u00fdvaj\u00ed z\u00e1kladn\u00ed slo\u017eitost a usnad\u0148uj\u00ed klient\u016fm pou\u017e\u00edv\u00e1n\u00ed syst\u00e9mu<\/p>\n\n\n\n
–Kompozitn\u00ed
Slo\u017een\u00fd vzor je strukturn\u00ed n\u00e1vrhov\u00fd vzor, \u200b\u200bkter\u00fd v\u00e1m umo\u017e\u0148uje skl\u00e1dat objekty do stromov\u00fdch struktur, kter\u00e9 reprezentuj\u00ed hierarchie \u010d\u00e1st\u00ed-celk\u016f.
Hlavn\u00ed my\u0161lenkou Composite Pattern je sestaven\u00ed stromov\u00e9 struktury objekt\u016f, kde jednotliv\u00e9 objekty a slo\u017een\u00e9 objekty sd\u00edlej\u00ed spole\u010dn\u00e9 rozhran\u00ed.<\/p>\n\n\n\n
Z\u00e1kladn\u00ed komponenta (odd\u011blen\u00ed): Jako na\u0161i z\u00e1kladn\u00ed komponentu definujeme jednoduch\u00e9 rozhran\u00ed odd\u011blen\u00ed:
J\u00e1va<\/p>\n\n\n\n
odd\u011blen\u00ed ve\u0159ejn\u00e9ho rozhran\u00ed {
void printDepartmentName();
}<\/p>\n\n\n\n
Komponenty listu (finan\u010dn\u00ed odd\u011blen\u00ed a obchodn\u00ed odd\u011blen\u00ed): Vytvo\u0159me t\u0159\u00eddy pro finan\u010dn\u00ed a obchodn\u00ed odd\u011blen\u00ed, p\u0159i\u010dem\u017e ob\u011b implementuj\u00ed rozhran\u00ed odd\u011blen\u00ed:
J\u00e1va<\/p>\n\n\n\n
public class FinancialDepartment implements Department {
\/\/ Podrobnosti o implementaci (nap\u0159. id, n\u00e1zev)
public void printDepartmentName() {
System.out.println(getClass().getSimpleName());
}
}<\/p>\n\n\n\n
public class Obchodn\u00ed odd\u011blen\u00ed implementuje odd\u011blen\u00ed {
\/\/ Podrobnosti o implementaci (nap\u0159. id, n\u00e1zev)
public void printDepartmentName() {
System.out.println(getClass().getSimpleName());
}
}<\/p>\n\n\n\n
Tyto listov\u00e9 t\u0159\u00eddy implementuj\u00ed metodu printDepartmentName() a neobsahuj\u00ed odkazy na jin\u00e9 objekty odd\u011blen\u00ed.
Slo\u017een\u00fd prvek (HeadDepartment): Jako slo\u017eenou t\u0159\u00eddu vytvo\u0159te HeadDepartment, kter\u00fd obsahuje kolekci komponent Department:
J\u00e1va<\/p>\n\n\n\n
import java.util.ArrayList;
import java.util.List;<\/p>\n\n\n\n
public class HeadDepartment implementuje Department {
soukrom\u00e9 cel\u00e9 \u010d\u00edslo id;
private String name;
private List childDepartments;<\/p>\n\n\n
\n\t
\n\t\t
\n\t\t\t\n
\n
public HeadDepartment(Integer id, String name) {<\/div>
    this.id = id;<\/div>
    this.name = name;<\/div>
    this.childDepartments = new ArrayList<>();<\/div>
}<\/div>
<\/div>
public void printDepartmentName() {<\/div>
    childDepartments.forEach(Department::printDepartmentName);<\/div>
}<\/div>
<\/div>
public void addDepartment(Department department) {<\/div>
    childDepartments.add(department);<\/div>
}<\/div>
<\/div>
public void removeDepartment(Department department) {<\/div>
    childDepartments.remove(department);<\/div>
}<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
}<\/p>\n\n\n\n
T\u0159\u00edda HeadDepartment implementuje metodu printDepartmentName() a poskytuje metody pro p\u0159id\u00e1v\u00e1n\u00ed a odeb\u00edr\u00e1n\u00ed pod\u0159\u00edzen\u00fdch odd\u011blen\u00ed.
Pou\u017eit\u00ed: M\u016f\u017eete vytvo\u0159it instance listov\u00fdch odd\u011blen\u00ed (nap\u0159. FinancialDepartment, SalesDepartment) a slo\u017een\u00e9ho odd\u011blen\u00ed (nap\u0159. HeadDepartment). P\u0159idejte do kompozitu odd\u011blen\u00ed list\u016f a vytiskn\u011bte jejich jm\u00e9na.
J\u00e1va<\/p>\n\n\n\n
public class Hlavn\u00ed {
public static void main(String[] args) {
Finance odd\u011blen\u00ed = new FinancialDepartment();
Prodej odd\u011blen\u00ed = new SalesDepartment();<\/p>\n\n\n\n
    HeadDepartment headDepartment = new HeadDepartment(1, "Company Departments");\n    headDepartment.addDepartment(finance);\n    headDepartment.addDepartment(sales);\n\n    headDepartment.printDepartmentName();\n}<\/code><\/pre>\n\n\n\n
}<\/p>\n\n\n\n
v\u00fdstup:
Finan\u010dn\u00ed odd\u011blen\u00ed
Obchodn\u00ed odd\u011blen\u00ed<\/p>\n\n\n\n
Slo\u017een\u00fd vzor umo\u017e\u0148uje vytv\u00e1\u0159et flexibiln\u00ed stromov\u00e9 struktury kde
s jednotliv\u00fdmi p\u0159edm\u011bty a kompozicemi (kompozity) lze zach\u00e1zet jednotn\u011b.<\/p>\n\n\n\n
Co je to HASH funkce!!!<\/p>\n\n\n\n
Ha\u0161ovac\u00ed funkce je matematick\u00e1 funkce, kter\u00e1 p\u0159ij\u00edm\u00e1 vstup (nebo \u201ezpr\u00e1vu\u201c) a vrac\u00ed \u0159et\u011bzec znak\u016f s pevnou velikost\u00ed,
co\u017e je typicky posloupnost \u010d\u00edsel a p\u00edsmen. Tento v\u00fdstup se naz\u00fdv\u00e1 \u201ehodnota hash\u201c nebo jednodu\u0161e \u201ehash\u201c.
Hashovac\u00ed funkce se b\u011b\u017en\u011b pou\u017e\u00edvaj\u00ed v informatice a kryptografii a maj\u00ed n\u011bkolik d\u016fle\u017eit\u00fdch vlastnost\u00ed:<\/p>\n\n\n\n
=== Jak byste pou\u017eili ha\u0161ovac\u00ed funkci a jak funguje?<\/p>\n\n\n\n
Deterministick\u00fd: Stejn\u00fd vstup v\u017edy vytvo\u0159\u00ed stejn\u00fd hash.<\/p>\n\n\n\n
Rychl\u00fd: Funkce m\u016f\u017ee rychle vypo\u010d\u00edtat hodnotu hash pro jak\u00fdkoli dan\u00fd vstup.
Jedine\u010dn\u00e9 (t\u00e9m\u011b\u0159): Dva r\u016fzn\u00e9 vstupy by m\u011bly vytv\u00e1\u0159et odli\u0161n\u00e9 hash (toto je zn\u00e1m\u00e9 jako minimalizace \u201ekoliz\u00ed\u201c).
Nevratn\u00e9: Vzhledem k hash by m\u011blo b\u00fdt v\u00fdpo\u010detn\u011b nemo\u017en\u00e9 ur\u010dit p\u016fvodn\u00ed vstup.
Uniform: Hodnoty hash jsou rovnom\u011brn\u011b rozlo\u017eeny ve v\u00fdstupn\u00edm prostoru.<\/p>\n\n\n\n
Hashovac\u00ed funkce jsou \u0161iroce pou\u017e\u00edv\u00e1ny v r\u016fzn\u00fdch aplikac\u00edch, jako jsou:<\/p>\n\n\n\n
Integrita dat: Chcete-li zajistit, aby data nebyla zm\u011bn\u011bna nebo zfal\u0161ov\u00e1na, porovn\u00e1n\u00edm hodnot hash.
Ukl\u00e1d\u00e1n\u00ed hesel: Bezpe\u010dn\u00e9 ukl\u00e1d\u00e1n\u00ed hashovan\u00fdch hesel nam\u00edsto skute\u010dn\u00fdch hesel.
Kryptografie: Pou\u017e\u00edv\u00e1 se v digit\u00e1ln\u00edch podpisech a dal\u0161\u00edch kryptografick\u00fdch algoritmech.
Hash Tables: Pro efektivn\u00ed vyhled\u00e1v\u00e1n\u00ed dat p\u0159i programov\u00e1n\u00ed.<\/p>\n\n\n\n
=== Uve\u010fte p\u0159\u00edklad hash mapy, jak byste ji pou\u017eili?<\/p>\n\n\n\n
SHA (Secure Hash Algorithm):
Zahrnuje varianty jako SHA-1, SHA-256, SHA-384 a SHA-512.
SHA-256 a SHA-512 jsou \u0161iroce pou\u017e\u00edv\u00e1ny v kryptografii a technologii blockchain (nap\u0159. Bitcoin).<\/p>\n\n\n\n
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;<\/p>\n\n\n\n
public class HashExample {
public static void main(String[] args) {
zkuste {
\/\/ Vstupn\u00ed \u0159et\u011bzec, kter\u00fd m\u00e1 b\u00fdt ha\u0161ov\u00e1n
String input = “Ahoj sv\u011bte!”;<\/p>\n\n\n\n
        \/\/ Create a MessageDigest instance for SHA-256\n        MessageDigest digest = MessageDigest.getInstance("SHA-256");\n\n        \/\/ Compute the hash\n        byte[] hash = digest.digest(input.getBytes());\n\n        \/\/ Convert the hash bytes to a hexadecimal string\n        StringBuilder hexString = new StringBuilder();\n        for (byte b : hash) {\n            String hex = String.format("%02x", b);\n            hexString.append(hex);\n        }\n\n        \/\/ Print the resulting hash\n        System.out.println("SHA-256 Hash: " + hexString.toString());\n    } catch (NoSuchAlgorithmException e) {\n        System.err.println("Error: " + e.getMessage());\n    }\n}<\/code><\/pre>\n\n\n\n
}<\/p>\n\n\n\n
Vstupn\u00ed data: Vstupn\u00ed prom\u011bnn\u00e1 obsahuje data, kter\u00e1 chcete ha\u0161ovat.
Inicializace MessageDigest: Instance MessageDigest je vytvo\u0159ena pomoc\u00ed getInstance(“SHA-256”), kter\u00e1 ur\u010duje hashovac\u00ed algoritmus SHA-256.
Ha\u0161ov\u00e1n\u00ed: Metoda digest po\u010d\u00edt\u00e1 hash vstupn\u00edch dat.
Hexadecim\u00e1ln\u00ed p\u0159evod: Vzhledem k tomu, \u017ee hash je v bin\u00e1rn\u00edm form\u00e1tu, pou\u017e\u00edv\u00e1me cyklus k jeho p\u0159evodu na \u010diteln\u011bj\u0161\u00ed hexadecim\u00e1ln\u00ed \u0159et\u011bzec.<\/p>\n\n\n\n
D\u00e1t a opravit? Kdy jej pou\u017e\u00edt?<\/p>\n\n\n\n
PUT i PATCH jsou metody HTTP pou\u017e\u00edvan\u00e9 k aktualizaci zdroj\u016f na serveru, ale li\u0161\u00ed se v tom, jak zpracov\u00e1vaj\u00ed aktualizace:<\/p>\n\n\n\n
D\u00c1T:
Kompletn\u00ed aktualizace:
PUT se pou\u017e\u00edv\u00e1 k \u00fapln\u00e9mu nahrazen\u00ed existuj\u00edc\u00edho zdroje.
V po\u017eadavku je t\u0159eba odeslat cel\u00fd zdroj, i kdy\u017e se m\u011bn\u00ed pouze jeho \u010d\u00e1st.<\/p>\n\n\n\n
Pokud zdroj neexistuje, PUT jej \u010dasto vytvo\u0159\u00ed (a\u010dkoli toto chov\u00e1n\u00ed se m\u016f\u017ee li\u0161it).<\/p>\n\n\n\n
Idempotentn\u00ed:<\/p>\n\n\n\n
Opakovan\u00e9 po\u017eadavky PUT se stejn\u00fdmi daty budou m\u00edt v\u017edy za n\u00e1sledek stejn\u00fd stav zdroje.
P\u0159\u00edklad: Aktualizace profilu u\u017eivatele:<\/p>\n\n\n\n
json
PUT \/users\/123
{
“name”: “Velislav”,
“e-mail”: “velislav@example.com”,
“v\u011bk”: 30
}
Pokud se zm\u011bn\u00ed pouze jm\u00e9no, ale e-mail a v\u011bk z\u016fstanou stejn\u00e9, mus\u00ed b\u00fdt st\u00e1le uvedeny v \u017e\u00e1dosti.<\/p>\n\n\n\n
Z\u00c1PLATY:
\u010c\u00e1ste\u010dn\u00e1 aktualizace:<\/p>\n\n\n\n
PATCH se pou\u017e\u00edv\u00e1 k \u010d\u00e1ste\u010dn\u00e9 aktualizaci existuj\u00edc\u00edho prost\u0159edku.
V \u017e\u00e1dosti je t\u0159eba odeslat pouze zm\u011bn\u011bn\u00e1 pole.<\/p>\n\n\n\n
Idempotentn\u00ed (v\u011bt\u0161inou):<\/p>\n\n\n\n
Stejn\u011b jako PUT, opakovan\u00e9 po\u017eadavky PATCH se stejn\u00fdmi daty obecn\u011b vedou ke stejn\u00e9mu stavu zdroje.
Chov\u00e1n\u00ed v\u0161ak m\u016f\u017ee z\u00e1viset na implementaci serveru.<\/p>\n\n\n\n
P\u0159\u00edklad: Aktualizace pouze jm\u00e9na u\u017eivatele:<\/p>\n\n\n\n
json
PATCH \/users\/123
{
“jm\u00e9no”: “Velislav”
}
Zde se aktualizuje pouze pole n\u00e1zvu, ostatn\u00ed pole z\u016fst\u00e1vaj\u00ed beze zm\u011bny.<\/p>\n\n\n\n
Kl\u00ed\u010dov\u00fd rozd\u00edl:
PUT nahrad\u00ed cel\u00fd prost\u0159edek, zat\u00edmco PATCH uprav\u00ed pouze specifikovan\u00e1 pole prost\u0159edku.<\/p>\n\n\n\n
HTTP metody s kr\u00e1tk\u00fdm popisem.<\/strong><\/p>\n\n\n\n
GET: Pou\u017e\u00edv\u00e1 se k na\u010dten\u00ed dat ze serveru bez jejich \u00fapravy. B\u011b\u017en\u011b se pou\u017e\u00edv\u00e1 pro z\u00edsk\u00e1v\u00e1n\u00ed zdroj\u016f nebo informac\u00ed.
POST: Pou\u017e\u00edv\u00e1 se k odes\u00edl\u00e1n\u00ed dat na server, obvykle k vytvo\u0159en\u00ed nov\u00e9ho zdroje. Nap\u0159\u00edklad odesl\u00e1n\u00ed formul\u00e1\u0159e nebo nahr\u00e1n\u00ed souboru.
PUT: Pou\u017e\u00edv\u00e1 se k aktualizaci nebo \u00fapln\u00e9mu nahrazen\u00ed existuj\u00edc\u00edho prost\u0159edku na serveru. Pokud zdroj neexistuje, m\u016f\u017ee b\u00fdt vytvo\u0159en.
OPRAVA: Pou\u017e\u00edv\u00e1 se pro \u010d\u00e1ste\u010dn\u00e9 aktualizace existuj\u00edc\u00edho prost\u0159edku, upravuj\u00edc\u00ed pouze ur\u010den\u00e1 pole.
DELETE: Pou\u017e\u00edv\u00e1 se k odstran\u011bn\u00ed prost\u0159edku ze serveru.
HEAD: Podobn\u011b jako GET, pou\u017e\u00edv\u00e1 se k na\u010dten\u00ed z\u00e1hlav\u00ed bez t\u011bla zdroje.
MO\u017dNOSTI: \u0158\u00edk\u00e1, jak\u00e9 metody HTTP jsou povoleny.
TRACE: Pou\u017e\u00edv\u00e1 se hlavn\u011b pro diagnostick\u00e9 \u00fa\u010dely odesl\u00e1n\u00edm po\u017eadavku zp\u011bt klientovi
CONNECT: Vytvo\u0159\u00ed tunel k serveru, kter\u00fd se \u010dasto pou\u017e\u00edv\u00e1 pro p\u0159ipojen\u00ed SSL\/TLS.<\/p>\n\n\n\n
========== Funk\u010dn\u00ed rozhran\u00ed ======================================<\/p>\n\n\n\n
Funk\u010dn\u00ed rozhran\u00ed v Jav\u011b je rozhran\u00ed, kter\u00e9 obsahuje pr\u00e1v\u011b jednu abstraktn\u00ed metodu. Tato rozhran\u00ed se pou\u017e\u00edvaj\u00ed p\u0159edev\u0161\u00edm v lambda v\u00fdrazech a odkazech na metody, co\u017e umo\u017e\u0148uje stru\u010dn\u011bj\u0161\u00ed a \u010diteln\u011bj\u0161\u00ed funk\u010dn\u00ed programov\u00e1n\u00ed.<\/p>\n\n\n\n
Kl\u00ed\u010dov\u00e9 vlastnosti:<\/h3>\n\n\n\n
    \n
  1. Jednotn\u00e1 abstraktn\u00ed metoda<\/strong>: Funk\u010dn\u00ed rozhran\u00ed m\u00e1 pouze jednu abstraktn\u00ed metodu. To je podstata jeho funk\u010dnosti.<\/li>\n\n\n\n
  2. V\u00fdchoz\u00ed a statick\u00e9 metody<\/strong>: Funk\u010dn\u00ed rozhran\u00ed mohou zahrnovat v\u00fdchoz\u00ed a statick\u00e9 metody, ale ty se nepo\u010d\u00edtaj\u00ed jako jedin\u00e1 abstraktn\u00ed metoda.<\/li>\n\n\n\n
  3. @FunctionalInterface Anotace<\/strong>: I kdy\u017e je tato anotace voliteln\u00e1, pom\u00e1h\u00e1 t\u00edm, \u017ee signalizuje, \u017ee rozhran\u00ed je zam\u00fd\u0161leno jako funk\u010dn\u00ed. Pokud jsou do rozhran\u00ed p\u0159id\u00e1ny dal\u0161\u00ed abstraktn\u00ed metody, kompil\u00e1tor vyvol\u00e1 chybu.<\/li>\n<\/ol>\n\n\n\n
    P\u0159\u00edklad:<\/h3>\n\n\n
    \n\t
    \n\t\t
    \n\t\t\t\n
    \n
    @FunctionalInterface<\/div>
    interface Calculator {<\/div>
        int calculate(int a, int b);<\/div>
    }<\/div>
    <\/div>
    \/\/ Using lambda expression<\/div>
    public class Main {<\/div>
        public static void main(String[] args) {<\/div>
            \/\/ Implementing the calculate method using a lambda<\/div>
            Calculator addition = (a, b) -> a + b;<\/div>
            Calculator multiplication = (a, b) -> a * b;<\/div>
    <\/div>
            System.out.println("Addition: " + addition.calculate(5, 3));  \/\/ Output: 8<\/div>
            System.out.println("Multiplication: " + multiplication.calculate(5, 3));  \/\/ Output: 15<\/div>
        }<\/div>
    }<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
    P\u0159\u00edpad pou\u017eit\u00ed:<\/h3>\n\n\n\n
    The Calculator<\/code> rozhran\u00ed v p\u0159\u00edkladu m\u00e1 jedinou abstraktn\u00ed metodu calculate<\/code>, co\u017e z n\u011bj d\u011bl\u00e1 funk\u010dn\u00ed rozhran\u00ed.
    To n\u00e1m umo\u017e\u0148uje pou\u017e\u00edvat v\u00fdrazy lambda pro stru\u010dnost a eleganci p\u0159i implementaci.<\/p>\n\n\n\n
    B\u011b\u017en\u00e1 funk\u010dn\u00ed rozhran\u00ed v Jav\u011b:<\/h3>\n\n\n\n
    Java poskytuje n\u011bkolik vestav\u011bn\u00fdch funk\u010dn\u00edch rozhran\u00ed v java.util.function<\/code> bal\u00ed\u010dky, jako nap\u0159\u00edklad:<\/p>\n\n\n\n
      \n
    • Predik\u00e1t<\/strong>: Vezme vstup a vr\u00e1t\u00ed boolean.<\/li>\n\n\n\n
    • Funkce<\/strong>: Vezme vstup a vr\u00e1t\u00ed v\u00fdstup typu R.<\/li>\n\n\n\n
    • Dodavatel<\/strong>: Poskytuje hodnotu bez zad\u00e1n\u00ed.<\/li>\n\n\n\n
    • Spot\u0159ebitel<\/strong>: P\u0159ijme hodnotu a provede akci.<\/li>\n<\/ul>\n\n\n\n
      Funk\u010dn\u00ed rozhran\u00ed zjednodu\u0161uj\u00ed operace, zejm\u00e9na ve sc\u00e9n\u00e1\u0159\u00edch, jako je pr\u00e1ce s kolekcemi, proudy nebo asynchronn\u00edmi \u00falohami.<\/p>\n\n\n\n
      Umo\u017e\u0148uj\u00ed Jav\u011b p\u0159ijmout funk\u010dn\u00ed programovac\u00ed paradigmata p\u0159i zachov\u00e1n\u00ed jej\u00ed objektov\u011b orientovan\u00e9 povahy.<\/h2>\n\n\n\n
      ================ Funkce vy\u0161\u0161\u00edho \u0159\u00e1du je ==============================
      Funkce vy\u0161\u0161\u00edho \u0159\u00e1du je funkce, kter\u00e1 bu\u010f bere jin\u00e9 funkce jako argumenty, nebo jako v\u00fdsledek vrac\u00ed funkci. Jin\u00fdmi slovy, operuje s funkcemi a zach\u00e1z\u00ed s nimi jako s \u201eob\u010dany prvn\u00ed t\u0159\u00eddy\u201c. Toto je v\u00fdkonn\u00e1 funkce v paradigmatech funk\u010dn\u00edho programov\u00e1n\u00ed, kter\u00e1 umo\u017e\u0148uje abstrakci, op\u011btovn\u00e9 pou\u017eit\u00ed k\u00f3du a kompozici.<\/p>\n\n\n\n
      P\u0159\u00edklad funkce vy\u0161\u0161\u00edho \u0159\u00e1du v Jav\u011b:<\/h3>\n\n\n
      \n\t
      \n\t\t
      \n\t\t\t\n
      \n
      import java.util.function.Function;<\/div>
      <\/div>
      public class Main {<\/div>
          public static void main(String[] args) {<\/div>
              \/\/ Higher-order function: applies a function to a value<\/div>
              Function<Integer, Integer> squareFunction = x -> x * x;<\/div>
              int result = applyFunction(5, squareFunction);<\/div>
              System.out.println("Square of 5: " + result);  \/\/ Output: 25<\/div>
          }<\/div>
      <\/div>
          public static int applyFunction(int value, Function<Integer, Integer> function) {<\/div>
              return function.apply(value);<\/div>
          }<\/div>
      }<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
      V p\u0159\u00edkladu v\u00fd\u0161e:<\/p>\n\n\n\n
        \n
      • The applyFunction<\/code> metoda je funkc\u00ed vy\u0161\u0161\u00edho \u0159\u00e1du, proto\u017ee p\u0159ij\u00edm\u00e1 jinou funkci (Function<Integer, Integer><\/code>) jako parametr.<\/li>\n<\/ul>\n\n\n\n
        Vlastnosti:<\/h3>\n\n\n\n
          \n
        1. P\u0159ij\u00edm\u00e1 funkce jako argumenty<\/strong>: Funkce vy\u0161\u0161\u00edho \u0159\u00e1du mohou m\u00edt jin\u00e9 funkce jako vstup pro prov\u00e1d\u011bn\u00ed specifick\u00fdch operac\u00ed.<\/li>\n\n\n\n
        2. Vr\u00e1t\u00ed funkce<\/strong>: Mohou dynamicky generovat a vracet nov\u00e9 funkce.<\/li>\n\n\n\n
        3. Podporuje op\u011btovn\u00e9 pou\u017eit\u00ed k\u00f3du<\/strong>: Podporuje modul\u00e1rn\u00ed a opakovan\u011b pou\u017eiteln\u00fd k\u00f3d, proto\u017ee funkce lze p\u0159ed\u00e1vat a skl\u00e1dat spole\u010dn\u011b.<\/li>\n<\/ol>\n\n\n\n
          P\u0159\u00edpad pou\u017eit\u00ed:<\/h3>\n\n\n\n
          V Jav\u011b se funkce vy\u0161\u0161\u00edho \u0159\u00e1du b\u011b\u017en\u011b pou\u017e\u00edvaj\u00ed ve funk\u010dn\u00edm programov\u00e1n\u00ed s proudy, lambdami a odkazy na metody. Nap\u0159\u00edklad:<\/p>\n\n\n
          \n\t
          \n\t\t
          \n\t\t\t\n
          \n
          List<String> names = Arrays.asList("John", "Jane", "Jake");<\/div>
          names.stream()<\/div>
               .filter(name -> name.startsWith("J"))  \/\/ Takes a lambda function as argument<\/div>
               .forEach(System.out::println);         \/\/ Takes a method reference as argument<\/div><\/code><\/pre>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n\n\n
          Funkce vy\u0161\u0161\u00edho \u0159\u00e1du p\u0159in\u00e1\u0161ej\u00ed flexibilitu a v\u00fdkon program\u016fm Java a umo\u017e\u0148uj\u00ed v\u00fdvoj\u00e1\u0159\u016fm ps\u00e1t \u010dist\u00fd, stru\u010dn\u00fd a v\u00fdrazn\u00fd k\u00f3d!<\/h2>\n\n\n\n
          Zde je n\u011bkolik odpov\u011bd\u00ed na rozhovory v re\u00e1ln\u00e9m sv\u011bt\u011b.<\/p>\n\n\n\n
            \n
          • Rozum\u00ed z\u00e1klad\u016fm, jako je polymorfismus, statick\u00e9 metody a fond \u0159et\u011bzc\u016f<\/li>\n\n\n\n
          • obezn\u00e1meni s kolekcemi (nap\u0159. HashSet, TreeSet) a jejich p\u0159\u00edpady pou\u017eit\u00ed.<\/li>\n\n\n\n
          • Spr\u00e1vn\u011b identifikuje rozsahy fazol\u00ed (singleton, prototyp)<\/li>\n\n\n\n
          • Uv\u011bdomte si injekce z\u00e1vislosti a jej\u00ed \u00fa\u010del.<\/li>\n\n\n\n
          • v\u00ed, jak implementovat vztahy many-to-many pomoc\u00ed spojovac\u00edch tabulek.<\/li>\n\n\n\n
          • Rozum\u00ed \u00fa\u010delu index\u016f (i kdy\u017e povrchn\u011b)<\/li>\n\n\n\n
          • dok\u00e1\u017ee rozli\u0161it mezi monolitickou a mikroservisn\u00ed architekturou<\/li>\n\n\n\n
          • rozum\u00ed z\u00e1kladn\u00edm kompromis\u016fm (\u0161k\u00e1lovatelnost, udr\u017eovatelnost)<\/li>\n\n\n\n
          • \u0161patn\u011b ch\u00e1pe Liskov\u016fv substitu\u010dn\u00ed princip a inverzi z\u00e1vislosti<\/li>\n\n\n\n
          • Sna\u017e\u00ed se poskytnout konkr\u00e9tn\u00ed p\u0159\u00edklady pro princip otev\u0159en\u00fd\/uzav\u0159en\u00fd.<\/li>\n\n\n\n
          • Postr\u00e1d\u00e1 hloubku v \u0159\u00edzen\u00ed \u017eivotn\u00edho cyklu fazol\u00ed<\/li>\n\n\n\n
          • Nejasn\u00e9 vkl\u00e1d\u00e1n\u00ed pokro\u010dil\u00e9 z\u00e1vislosti<\/li>\n\n\n\n
          • povrchn\u00ed porozum\u011bn\u00ed index\u016fm (slo\u017een\u00e9 indexy, optimalizace dotaz\u016f)<\/li>\n\n\n\n
          • Nezn\u00e1te \u00farovn\u011b izolace a optimistick\u00e9\/pesimistick\u00e9 zamyk\u00e1n\u00ed<\/li>\n<\/ul>\n\n\n\n
            Pro:<\/p>\n\n\n\n
              \n
            • Pracovalo se se star\u0161\u00edm k\u00f3dem v obrovsk\u00e9m a slo\u017eit\u00e9m syst\u00e9mu<\/li>\n\n\n\n
            • Zn\u00e1 SOLID<\/li>\n\n\n\n
            • Znalost proud\u016f<\/li>\n\n\n\n
            • Vysv\u011btlen\u00e9 indexy a ACID<\/li>\n\n\n\n
            • Dobr\u00e1 \u00farove\u0148 angli\u010dtiny
              nev\u00fdhody:<\/li>\n\n\n\n
            • \u017d\u00e1dn\u00e1 odpov\u011bdnost za nasazen\u00ed nebo infrastrukturu, \u00fa\u010dast na n\u00e1vrhu architektury<\/li>\n\n\n\n
            • M\u00e1 ur\u010dit\u00e9 znalosti o principech OOP, ale opravdu se sna\u017eil je vysv\u011btlit a n\u011bkter\u00e9 koncepty se m\u00fdlily<\/li>\n\n\n\n
            • Obecn\u00e1 znalost sb\u00edrek m\u00e1 ale mezery a je velmi nejist\u00e1<\/li>\n\n\n\n
            • Nerozum\u00ed rozd\u00edlu mezi soub\u011b\u017enost\u00ed a paralelismem, nep\u0159\u00edli\u0161 siln\u00e1 znalost soub\u011b\u017enosti<\/li>\n\n\n\n
            • Moc jsem se nezab\u00fdval architekturou mikro slu\u017eeb<\/li>\n\n\n\n
            • V\u00e1gn\u00ed u n\u011bkter\u00fdch datab\u00e1zov\u00fdch koncept\u016f (diskuze o indexech byla povrchov\u00e1)<\/li>\n\n\n\n
            • Livelock se nepoda\u0159ilo vysv\u011btlit<\/li>\n\n\n\n
            • Mezery v porozum\u011bn\u00ed nakonec blokuj\u00ed<\/li>\n\n\n\n
            • Omezen\u00e1 znalost specifik zpracov\u00e1n\u00ed v\u00fdjimek<\/li>\n\n\n\n
            • Zmaten\u00e9 ohledn\u011b modifik\u00e1tor\u016f p\u0159\u00edstupu (chr\u00e1n\u011bn\u00e9 vs. soukrom\u00fd bal\u00ed\u010dek)
              Konsensu\u00e1ln\u00ed n\u00e1zor \u2026.. je
              nen\u00ed vhodn\u00fd pro pozici v\u00fdvoj\u00e1\u0159e ve st\u0159edn\u00ed J\u00e1v\u011b kv\u016fli mezer\u00e1m v jeho technick\u00fdch znalostech.<\/li>\n<\/ul>\n\n\n\n
              Pros
              Dob\u0159e vysv\u011btleno SOLID
              Dob\u0159e vysv\u011btlil OOP
              Vysv\u011btlen\u00e1 kompozice (ale zpo\u010d\u00e1tku trochu bojovala)
              V\u00fdborn\u00e1 znalost sb\u00edrek
              Rozd\u00edl mezi seznamy a mno\u017einami
              Hashsety
              Hashmap
              ConcurrentHashmap
              Dobr\u00e1 znalost datov\u00fdch struktur – z\u00e1sobn\u00edky, fronty, stromy
              Dobr\u00e1 znalost architektury jvm
              Vysv\u011btlen\u00ed soub\u011b\u017enosti vs paralelismus, prok\u00e1z\u00e1n\u00ed dobr\u00fdch znalost\u00ed v\u00edcevl\u00e1knov\u00fdch aplikac\u00ed
              Dobr\u00e9 pochopen\u00ed REST
              Dob\u0159e vysv\u011btlil db indexy
              Vysv\u011btlil r\u016fzn\u00e9 typy spojen\u00ed<\/p>\n\n\n\n
              <\/p>\n","protected":false},"excerpt":{"rendered":"
              Jakke jsou principy SOLID? Jak\u00fd je princip jednotn\u00e9 odpov\u011bdnosti (SRP): T\u0159\u00edda by m\u011bla m\u00edt pouze jednu odpov\u011bdnost. Ke v\u011bdn\u011b by m\u011bla m\u00edt jedinou odpov\u011bdnost. Mezi v\u00fdhody pat\u0159\u00ed snadn\u011bj\u0161\u00ed testov\u00e1n\u00ed, ni\u017e\u0161\u00ed konektivita a lep\u0161\u00ed organizace. P\u0159\u00edklad: J\u00e1va ve\u0159ejn\u00e1 t\u0159\u00edda Kniha {private String name; soukrom\u00fd autor k\u00e9tzelce; soukrom\u00fd text k\u00e9tzelce;\/\/ konstruktori, getry a nastavova\u010de} Co je otev\u0159en\u00fd princip (OCP): Softwarov\u00e9 entity (t\u0159\u00eddy, […]<\/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":"","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":[11788,789678139,2549795,196,789678143],"class_list":["post-2308","post","type-post","status-publish","format-standard","hentry","category-java","tag-rozhovor","tag-rozhovor-s-java-vyvojarem","tag-java","tag-programovani","tag-dotazy-java-developer"],"jetpack_publicize_connections":[],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4CoHV-Be","jetpack-related-posts":[{"id":2537,"url":"https:\/\/vkrastev1blog.com\/2026\/10\/02\/%d1%82%d1%80%d0%b5%d1%82%d0%b8%d1%8f%d1%82-%d0%b2%d1%81%d0%b5%d0%bb%d0%b5%d0%bd%d1%81%d0%ba%d0%b8-%d1%81%d1%8a%d0%b1%d0%be%d1%80-%d0%b2-%d0%b5%d1%84%d0%b5%d1%81-431-%d0%b3-%d1%85%d1%80%d0%b8%d1%81\/","url_meta":{"origin":2308,"position":0},"title":"T\u0159et\u00ed ekumenick\u00fd koncil v Efezu (431): christologick\u00fd spor mezi Cyrilem Alexandrijsk\u00fdm a Nestoriem a potvrzen\u00ed nauky o Matce Bo\u017e\u00ed","author":"vkrastev2014","date":"02.10.2026","format":false,"excerpt":"\u0422\u0440\u0435\u0442\u0438\u044f\u0442 \u0432\u0441\u0435\u043b\u0435\u043d\u0441\u043a\u0438 \u0441\u044a\u0431\u043e\u0440 \u0432 \u0415\u0444\u0435\u0441 (431 \u0433.): \u0445\u0440\u0438\u0441\u0442\u043e\u043b\u043e\u0433\u0438\u0447\u043d\u0438\u044f\u0442 \u0441\u043f\u043e\u0440 \u043c\u0435\u0436\u0434\u0443 \u041a\u0438\u0440\u0438\u043b \u0410\u043b\u0435\u043a\u0441\u0430\u043d\u0434\u0440\u0438\u0439\u0441\u043a\u0438 \u0438 \u041d\u0435\u0441\u0442\u043e\u0440\u0438\u0439 \u0438 \u0443\u0442\u0432\u044a\u0440\u0436\u0434\u0430\u0432\u0430\u043d\u0435\u0442\u043e \u043d\u0430 \u0443\u0447\u0435\u043d\u0438\u0435\u0442\u043e \u0437\u0430 \u0411\u043e\u0433\u043e\u0440\u043e\u0434\u0438\u0446\u0430 \u041d\u0430\u0443\u0447\u043d\u043e-\u0438\u0441\u0442\u043e\u0440\u0438\u0447\u0435\u0441\u043a\u043e \u0438 \u0431\u043e\u0433\u043e\u0441\u043b\u043e\u0432\u0441\u043a\u043e \u0438\u0437\u0441\u043b\u0435\u0434\u0432\u0430\u043d\u0435 \u0410\u0432\u0442\u043e\u0440: \u0412\u0435\u043b\u0438\u0441\u043b\u0430\u0432 \u041a\u0440\u044a\u0441\u0442\u0435\u0432\u0422\u0435\u043c\u0430: \u0418\u0441\u0442\u043e\u0440\u0438\u044f \u043d\u0430 \u0440\u0430\u043d\u043d\u0430\u0442\u0430 \u0426\u044a\u0440\u043a\u0432\u0430 \u0438 \u0440\u0430\u0437\u0432\u0438\u0442\u0438\u0435 \u043d\u0430 \u0445\u0440\u0438\u0441\u0442\u043e\u043b\u043e\u0433\u0438\u0447\u043d\u0430\u0442\u0430 \u0434\u043e\u0433\u043c\u0430\u0442\u0438\u043a\u0430\u041f\u0435\u0440\u0438\u043e\u0434: 428\u2013451 \u0433.\u041e\u0441\u043d\u043e\u0432\u043d\u043e \u0441\u044a\u0431\u0438\u0442\u0438\u0435: \u0422\u0440\u0435\u0442\u0438\u044f\u0442 \u0432\u0441\u0435\u043b\u0435\u043d\u0441\u043a\u0438 \u0441\u044a\u0431\u043e\u0440, \u0415\u0444\u0435\u0441, 431 \u0433. \u0420\u0435\u0437\u044e\u043c\u0435 \u0422\u0440\u0435\u0442\u0438\u044f\u0442 \u0432\u0441\u0435\u043b\u0435\u043d\u0441\u043a\u0438 \u0441\u044a\u0431\u043e\u0440, \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u2026","rel":"","context":"In "\u010cl\u00e1nky v\u011bnovan\u00e9 Bibli a o duchu a t\u011ble"","block_context":{"text":"\u010cl\u00e1nky v\u011bnovan\u00e9 Bibli a o duchu a 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\u043f\u0440\u0435\u0437 381 \u0433. \u0432 \u041a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u0438\u043d\u043e\u043f\u043e\u043b, \u0435 \u0435\u0434\u043d\u043e \u043e\u0442 \u043d\u0430\u0439-\u0432\u0430\u0436\u043d\u0438\u0442\u0435 \u0441\u044a\u0431\u0438\u0442\u0438\u044f \u0432 \u0438\u0441\u0442\u043e\u0440\u0438\u044f\u0442\u0430 \u043d\u0430 \u0440\u0430\u043d\u043d\u043e\u0442\u043e \u0445\u0440\u0438\u0441\u0442\u0438\u044f\u043d\u0441\u0442\u0432\u043e. \u041d\u0430 \u043d\u0435\u0433\u043e \u0435 \u043f\u043e\u0442\u0432\u044a\u0440\u0434\u0435\u043d\u0430 \u041d\u0438\u043a\u0435\u0439\u0441\u043a\u0430\u0442\u0430 \u0432\u044f\u0440\u0430 \u043e\u0442 325\u2026","rel":"","context":"In "\u010cl\u00e1nky v\u011bnovan\u00e9 Bibli a o duchu a t\u011ble"","block_context":{"text":"\u010cl\u00e1nky v\u011bnovan\u00e9 Bibli a o duchu a 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\u0434\u043e \u0438\u0437\u043a\u0443\u0441\u0442\u0432\u0435\u043d\u0430 \u0440\u0435\u0442\u0438\u043d\u0430 \u0438 \u0442\u0440\u0430\u043d\u0441\u043f\u043b\u0430\u043d\u0442\u0430\u0446\u0438\u044f \u043d\u0430 \u0446\u044f\u043b\u043e \u043e\u043a\u043e \u0418\u0434\u0435\u044f\u0442\u0430 \u0437\u0430 \u0441\u044a\u0437\u0434\u0430\u0432\u0430\u043d\u0435 \u043d\u0430 \u0438\u0437\u043a\u0443\u0441\u0442\u0432\u0435\u043d\u043e \u043e\u043a\u043e, \u043a\u043e\u0435\u0442\u043e \u0434\u0430 \u0437\u0430\u043c\u0435\u043d\u0438 \u043d\u0430\u043f\u044a\u043b\u043d\u043e \u0447\u043e\u0432\u0435\u0448\u043a\u043e\u0442\u043e \u043e\u043a\u043e \u0438 \u0434\u0430 \u0432\u044a\u0437\u0441\u0442\u0430\u043d\u043e\u0432\u0438 \u0437\u0440\u0435\u043d\u0438\u0435\u0442\u043e \u043d\u0430 \u0441\u043b\u0435\u043f\u0438 \u0445\u043e\u0440\u0430, \u0434\u044a\u043b\u0433\u043e \u0432\u0440\u0435\u043c\u0435 \u043f\u0440\u0438\u043d\u0430\u0434\u043b\u0435\u0436\u0435\u0448\u0435 \u043f\u0440\u0435\u0434\u0438\u043c\u043d\u043e \u043d\u0430 \u043d\u0430\u0443\u0447\u043d\u0430\u0442\u0430 \u0444\u0430\u043d\u0442\u0430\u0441\u0442\u0438\u043a\u0430. \u041f\u0440\u0435\u0437 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0438\u0442\u0435 \u0434\u0435\u0441\u0435\u0442\u0438\u043b\u0435\u0442\u0438\u044f\u2026","rel":"","context":"In "Um\u011bl\u00e9 org\u00e1ny \u2013 kam a\u017e v\u011bda dosp\u011bla v roce 2026"","block_context":{"text":"Um\u011bl\u00e9 org\u00e1ny \u2013 kam a\u017e v\u011bda dosp\u011bla v roce 2026","link":"https:\/\/vkrastev1blog.com\/category\/umele-organy-kam-az-veda-dospela-v-roce-2026\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2024\/05\/d0bed0bad0be.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/vkrastev1blog.com\/wp-content\/uploads\/2024\/05\/d0bed0bad0be.jpg?resize=350%2C200&ssl=1 1x, 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