{"id":14259,"date":"2018-10-11T15:03:10","date_gmt":"2018-10-11T14:03:10","guid":{"rendered":"https:\/\/annaf34.sg-host.com\/?p=14259"},"modified":"2022-03-22T14:14:35","modified_gmt":"2022-03-22T13:14:35","slug":"5-ok-amiert-a-java-programozas-10-ev-mulva-is-jol-fog-jonni","status":"publish","type":"post","link":"https:\/\/codecool.com\/hu\/5-ok-amiert-a-java-programozas-10-ev-mulva-is-jol-fog-jonni\/","title":{"rendered":"5 ok, ami\u00e9rt a Java programoz\u00e1s 10 \u00e9v m\u00falva is j\u00f3l fog j\u00f6nni"},"content":{"rendered":"\t\t
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Java ma \u00e9s holnap<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A Java\u00a0programoz\u00e1s<\/a>\u00a0egy igazi \u00f6r\u00f6kz\u00f6ld: f\u0151szerepl\u0151 volt az internet, majd az okostelefonok \u00e9s a felh\u0151alap\u00fa technol\u00f3gi\u00e1k robban\u00e1s\u00e1ban is, \u00e9s jelenleg olyan \u00f3ri\u00e1sc\u00e9gek haszn\u00e1lj\u00e1k, mint az Amazon, a LinkedIn, a Twitter vagy a Netflix. Az \u00f6sszes Androidos mobilr\u00f3l nem is besz\u00e9lve. Pedig a Java t\u00f6bb mint k\u00e9t \u00e9vtizedes t\u00f6rt\u00e9nete nem volt mindig z\u00f6kken\u0151mentes: sokan eml\u00e9keznek m\u00e9g a tulajdonosv\u00e1lt\u00e1st k\u00f6vet\u0151 hossz\u00fa stagn\u00e1l\u00e1sra, a 2010-es \u00e9vek amerikai szoftverbiztons\u00e1gi riaszt\u00e1saira vagy a m\u00e9g mindig lez\u00e1ratlan peresked\u00e9sre a Google-lal. De hi\u00e1ba j\u00f6nnek az \u00fajabb \u00e9s \u00fajabb sl\u00e1gernyelvek, a Java \u00e9vek \u00f3ta\u00a0vezeti a TIOBE n\u00e9pszer\u0171s\u00e9gi rangsor\u00e1t<\/a>\u00a0\u00e9s becsl\u00e9sek szerint ma vil\u00e1gszerte legal\u00e1bb\u00a015 milli\u00e1rd eszk\u00f6z\u00f6n fut, 10 milli\u00f3 programoz\u00f3 k\u00f3dol vele, 5 milli\u00f3 pedig tanulja<\/a>. Az oktat\u00e1sban bebetonozott helye van: a legt\u00f6bb helyen \u2013 \u00a0\u00edgy a Codecool iskol\u00e1iban is \u2013 ezen a nyelven kereszt\u00fcl tan\u00edtjuk meg az objektumalap\u00fa programoz\u00e1st. \u00c9s ez egy j\u00f3 darabig biztos \u00edgy is marad. Mutatjuk, mi\u00e9rt lesz a Java-tud\u00e1s 10 \u00e9v m\u00falva is hasznos. \u00a0\u00a0\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1. B\u00e1rhol, b\u00e1rmikor<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Avagy \u00a0\u201eWrite once, run anywhere\u201d (\u201e\u00cdrd meg egyszer \u00e9s futtasd b\u00e1rhol\u201d). \u00a0A nyelv meg\u00e1lmod\u00f3inak h\u00edres mantr\u00e1ja a gyakorlatban annyit jelent, hogy a Java egy olyan \u00e1ltal\u00e1nos c\u00e9l\u00fa programoz\u00e1si nyelv, ami f\u00fcggetlen a platformt\u00f3l \u00e9s az oper\u00e1ci\u00f3s rendszert\u0151l, amin fut. S\u0151t att\u00f3l is, mikor \u00edr\u00f3dott a k\u00f3d. Azaz egy Jav\u00e1ban meg\u00edrt program ak\u00e1r 15-20 \u00e9vvel k\u00e9s\u0151bb is m\u0171k\u00f6d\u0151k\u00e9pes, a verzi\u00f3k k\u00f6z\u00f6tt k\u00f6nny\u0171 v\u00e1ltani \u00e9s a k\u00f3dot nem kell \u00e1tmigr\u00e1lni valamilyen \u00faj nyelvre ahhoz, hogy hozz\u00e1 tudjunk ny\u00falni. A megb\u00edzhat\u00f3s\u00e1g, hordozhat\u00f3s\u00e1g \u00e9s visszafel\u00e9 kompatibilit\u00e1s a legf\u0151bb okai a Java programoz\u00e1s t\u00f6retlen n\u00e9pszer\u0171s\u00e9g\u00e9nek: egy megakadt vagy id\u0151k\u00f6zben elavult projekt viszonylag kev\u00e9s macer\u00e1val b\u00e1rmikor folytathat\u00f3 \u00e9s sokf\u00e9le eszk\u00f6z\u00f6n \u00e9s oper\u00e1ci\u00f3s rendszerben futtathat\u00f3, a Linuxt\u00f3l a Mac OS X-ig.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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2. Sok kicsi sokra megy<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Egy nagyobb projektn\u00e9l nem ritka, hogy egym\u00e1ssal p\u00e1rhuzamosan csom\u00f3an dolgoznak egy-egy r\u00e9szlet\u00e9n. A Java programoz\u00e1s hatalmas el\u0151nye, hogy a\u00a0Pythonhoz hasonl\u00f3an modul\u00e1ris<\/a>, \u00edgy a k\u00fcl\u00f6nb\u00f6z\u0151 csapatok \u00e1ltal lefejlesztett kis blokkok gond n\u00e9lk\u00fcl \u00f6sszepasszinthat\u00f3ak \u00e9s a statikus t\u00edpusellen\u0151rz\u00e9snek h\u00e1la, j\u00f3 es\u00e9llyel egy\u00fctt is m\u0171k\u00f6dni fognak. S\u0151t, a modulok a k\u00e9s\u0151bbiekben \u00fajrahasznos\u00edthat\u00f3ak is. Az sem mell\u00e9kes, hogy b\u00e1r a Java specifik\u00e1ci\u00f3 egy kifejezetten vaskos kiadv\u00e1ny, az esetek t\u00falnyom\u00f3 t\u00f6bbs\u00e9g\u00e9ben nem fog probl\u00e9m\u00e1t okozni, hogy elolvassuk m\u00e1s fejleszt\u0151 Java-k\u00f3dj\u00e1t. Ennek k\u00f6sz\u00f6nhet\u0151, hogy Jav\u00e1ban meg\u00edrt programokn\u00e1l \u00e1ltal\u00e1ban k\u00f6nny\u0171 felvenni a fonalat, ak\u00e1r valaki m\u00e1s \u00e1ltal elkezdett projektr\u0151l, ak\u00e1r egy \u00faj csapattag beilleszked\u00e9s\u00e9r\u0151l van sz\u00f3.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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3. T\u00f6bb mint egy nyelv<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A Java nemcsak egy programoz\u00e1si nyelv, hanem egy eg\u00e9sz infrastrukt\u00fara, amin programokat lehet futtatni. M\u00e9ghozz\u00e1 gyorsan. Hogy mi\u00e9rt? J\u00e1r hozz\u00e1 egy hatalmas sztenderd k\u00f6nyvt\u00e1r, amiben a d\u00e1tumok \u00e9s sz\u00f6vegek kezel\u00e9s\u00e9t\u0151l a gy\u0171jtem\u00e9nyt\u00edpusokig minden egys\u00e9ges\u00edtve van, \u00e9s egy \u00fan. Java Virtual Machine, ami lehet\u0151v\u00e9 teszi programok futtat\u00e1s\u00e1t Java b\u00e1jtk\u00f3ddal egy k\u00f6ztes r\u00e9tegen, a virtu\u00e1lis g\u00e9pen kereszt\u00fcl. Ez az\u00e9rt nagyon hasznos, mert a JVM seg\u00edts\u00e9g\u00e9vel \u00f6ssze tudunk dobni egy vadi\u00faj hibridnyelvet, ami azt\u00e1n k\u00f6nnyed\u00e9n egy\u00fctt tud dolgozni m\u00e1s, Jav\u00e1ban \u00edrt k\u00f3dokkal. \u00cdgy sz\u00fcletett p\u00e9ld\u00e1ul a webfejleszt\u0151k k\u00f6r\u00e9ben egyre n\u00e9pszer\u0171bb full stack nyelv, a\u00a0Clojure<\/a>, a Jav\u00e1hoz hasonl\u00f3, modern funkcion\u00e1lis programoz\u00e1si feature-\u00f6kkel h\u00f3d\u00edt\u00f3\u00a0Scala<\/a>, \u00e9s az Android m\u00e1sik hivatalos nyelve, a\u00a0Kotlin<\/a>\u00a0is. \u00c9s ne feledj\u00fck el a m\u00e1r l\u00e9tez\u0151 nyelvek JVM-en fut\u00f3 v\u00e1ltozatait sem: a Ruby\u00e9 a\u00a0JRuby<\/a>, a Python\u00e9 a\u00a0Jython<\/a>, a Common Lisp\u00e9 pedig az\u00a0ABCL<\/a>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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4. Nagy c\u00e9gek nagy kedvence<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A nagyv\u00e1llalatok k\u00f6r\u00e9ben tarol a Java programoz\u00e1s: per pillanat\u00a0a c\u00e9ges munkafel\u00fcletek t\u00f6bb mint 95%-a ezen a nyelven fut<\/a>. Ez aligha meglep\u0151, hiszen direkt erre a k\u00f6rnyezetre lett kital\u00e1lva, \u00e9s ahogy az eddigiekb\u0151l is kider\u00fclt, a Jav\u00e1n\u00e1l a kezdetekt\u0151l fogva nagyon figyeltek arra, hogy a lehet\u0151 legink\u00e1bb megk\u00f6nny\u00edts\u00e9k a gigaprojektek kivitelez\u00e9s\u00e9t \u00e9s fenntarts\u00e1k a k\u00f3dok hordozhat\u00f3s\u00e1g\u00e1t. Ma az eg\u00e9sz vil\u00e1gon \u00f3ri\u00e1si a kereslet a Jav\u00e1t ismer\u0151 szakemberekre, ami sz\u00e9pen megdobja a fizet\u00e9seket is: Magyarorsz\u00e1gon p\u00e9ld\u00e1ul m\u00e1r\u00a0\u00e9vek \u00f3ta \u0151k viszik haza a legt\u00f6bbet a piacon<\/a>. A Codecool eddigi v\u00e9gz\u0151seinek t\u00f6bbs\u00e9ge is Java-programoz\u00f3 lett, a kurzus ut\u00e1n \u00e1ltal\u00e1ban junior backend vagy full stack fejleszt\u0151k\u00e9nt helyezkedtek el valamelyik partnerc\u00e9g\u00fcnkn\u00e9l.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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5. V\u00e9ge a stagn\u00e1l\u00e1snak<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Volt id\u0151, amikor a Java el\u00e9g k\u00e9nyelmes temp\u00f3ban, j\u00f3 esetben k\u00e9t-h\u00e1rom \u00e9vente dobta piacra az \u00faj verzi\u00f3kat. Tavaly szeptemberben azonban szak\u00edtottak ezzel a gyakorlattal: Mark Reinhold, az Oracle Java-fejleszt\u00e9sek\u00e9rt felel\u0151s vezet\u0151 m\u00e9rn\u00f6ke f\u00e9l\u00e9vente megjelen\u0151 friss\u00edt\u00e9seket \u00edg\u00e9rt, \u00e9s \u00fagy t\u0171nik, eddig b\u00edrj\u00e1k az iramot. Az els\u0151 hatalmas l\u00e9p\u00e9s a funkcion\u00e1lis interf\u00e9szek megjelen\u00e9se volt a 2014-es Java 8-ban, amik v\u00e9gre lehet\u0151v\u00e9 tett\u00e9k olyan \u00faj interf\u00e9szek behozatal\u00e1t, mint p\u00e9ld\u00e1ul a Stream. \u00c9s meg\u00e9rkeztek vele a v\u00e1rva v\u00e1rt Lambda kifejez\u00e9sek is, amik l\u00e9nyegesen leegyszer\u0171s\u00edtett\u00e9k a programok szerkezet\u00e9t, egy csom\u00f3 g\u00e9pel\u00e9st megsp\u00f3rolva nek\u00fcnk ezzel. A 2017-ben megjelent Java 9 legfontosabb \u00faj\u00edt\u00e1sa egy h\u00e9t \u00e9ve tervezett opcion\u00e1lis modulrendszer volt, ami sokkal nagyobb kontrollt ad nek\u00fcnk afelett, hogy mik\u00e9nt haszn\u00e1lj\u00e1k majd a k\u00f3dunkat egy m\u00e1sik modulban. A Java 10 pedig m\u00e9g kevesebb g\u00e9pel\u00e9st hozott: a lok\u00e1lis t\u00edpuskik\u00f6vetkeztet\u00e9s tov\u00e1bbfejleszt\u00e9s\u00e9nek k\u00f6sz\u00f6nhet\u0151en imm\u00e1r a helyi v\u00e1ltoz\u00f3ink t\u00edpus\u00e1nak kital\u00e1l\u00e1s\u00e1t is r\u00e1b\u00edzhatjuk a ford\u00edt\u00f3ra. \u00c9s m\u00e1r itt is a legfrissebb verzi\u00f3, a\u00a0Java 11<\/a>.<\/p>


\u00dagy \u00e9rzed, belev\u00e1gn\u00e1l a programoz\u00e1sba?\u00a0Jelentkezz a Codecool k\u00e9thetente indul\u00f3 programoz\u00f3k\u00e9pz\u00e9s\u00e9re<\/a> \u00e9s szerezz piack\u00e9pes, biztos tud\u00e1st egy \u00e9v alatt!<\/strong><\/p><\/div><\/section>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

A Java programoz\u00e1s egy igazi \u00f6r\u00f6kz\u00f6ld: f\u0151szerepl\u0151 volt az internet, majd az okostelefonok \u00e9s a felh\u0151alap\u00fa technol\u00f3gi\u00e1k robban\u00e1s\u00e1ban is. Mutatjuk, mi\u00e9rt lesz 10 \u00e9v m\u00falva is hasznos. <\/p>\n","protected":false},"author":4,"featured_media":14260,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[128,127],"tags":[],"class_list":["post-14259","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programozas-hu","category-trendek-hu"],"yoast_head":"\n5 ok, ami\u00e9rt a Java programoz\u00e1s 10 \u00e9v m\u00falva is j\u00f3l fog j\u00f6nni - Codecool<\/title>\n<meta name=\"description\" content=\"A Java programoz\u00e1s igazi \u00f6r\u00f6kz\u00f6ld, \u00e9s kifizet\u0151d\u0151 megtanulni. 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