{"id":39785,"date":"2022-05-13T08:39:41","date_gmt":"2022-05-13T07:39:41","guid":{"rendered":"https:\/\/codecool.com\/?p=39785"},"modified":"2025-01-22T09:58:24","modified_gmt":"2025-01-22T08:58:24","slug":"negy-ok-miert-vagj-bele-egy-java-backend-kepzesbe-2022-ben","status":"publish","type":"post","link":"https:\/\/codecool.com\/hu\/negy-ok-miert-vagj-bele-egy-java-backend-kepzesbe-2022-ben\/","title":{"rendered":"N\u00e9gy ok, mi\u00e9rt v\u00e1gj bele egy Java backend k\u00e9pz\u00e9sbe 2022-ben"},"content":{"rendered":"\t\t
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Kib\u0151l lesz j\u00f3 backendes? Mennyire neh\u00e9z a Java? \u00c9s mire j\u00f3 a Java backend programoz\u00e1s egy\u00e1ltal\u00e1n? A ny\u00edlt napjainkon<\/a> rendszeresen halljuk t\u0151letek ezeket a k\u00e9rd\u00e9seket, ez\u00e9rt \u00fagy d\u00f6nt\u00f6tt\u00fcnk, \u00f6sszeszedj\u00fck egy helyen, amit a Jav\u00e1r\u00f3l \u00e9s a Codecool Java backend k\u00e9pz\u00e9s<\/a>\u00e9r\u0151l tudni \u00e9rdemes. \u00cdme!<\/p>\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

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1. Frontend vs. backend, konyhanyelven<\/h2>\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
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Eml\u00e9keztet\u0151\u00fcl: az alkalmaz\u00e1sfejleszt\u00e9s<\/strong>nek alapvet\u0151en k\u00e9t oldala van. A frontend<\/strong> foglalkozik mindazzal, amit a felhaszn\u00e1l\u00f3 l\u00e1t \u00e9s haszn\u00e1l, mint p\u00e9ld\u00e1ul gombok, linkek, men\u00fck vagy \u0171rlapok. A backend<\/strong> gondoskodik arr\u00f3l, hogy a vizu\u00e1lis elemek m\u00f6g\u00f6tt megb\u00faj\u00f3 folyamatok gyorsan, biztons\u00e1gosan, z\u00f6kken\u0151mentesen, eredm\u00e9nyesen \u00e9s hib\u00e1tlanul lefussanak.<\/p>

A kedvenc hasonlatunkkal \u00e9lve<\/a>: a frontend olyan, mint egy \u00e9tterem vend\u00e9gtere, ahol a pinc\u00e9rek le\u00fcltetik a vend\u00e9geket, seg\u00edtenek nekik v\u00e1lasztani az \u00e9tlapr\u00f3l, majd leteszik el\u00e9j\u00fck a kiv\u00e1lasztott \u00e9telt. A backend a konyha, ahol a szak\u00e1csok a hozz\u00e1val\u00f3kat t\u00e1rolj\u00e1k \u00e9s elk\u00e9sz\u00edtik a fog\u00e1sokat<\/strong>. Val\u00f3sz\u00edn\u0171leg kital\u00e1ltad, hogy a frontend fejleszt\u0151k a pinc\u00e9rek, akiknek a feladata, hogy kiemelked\u0151 vend\u00e9g\u00e9lm\u00e9nyt ny\u00fajtsanak, m\u00edg a backend fejleszt\u0151k a szak\u00e1csok, akik azon dolgoznak, hogy a lehet\u0151 legjobb min\u0151s\u00e9gben \u00e9s a leghat\u00e9konyabban teljes\u00edts\u00e9k a rendel\u00e9seket.<\/p>

Mindk\u00e9t oldal ig\u00e9nyel kreativit\u00e1st, de m\u00edg a frontenden a vizu\u00e1lis \u00e9s felhaszn\u00e1l\u00f3i \u00e9lm\u00e9ny n\u00f6vel\u00e9se a c\u00e9l, a backend oldalon ink\u00e1bb a probl\u00e9maelh\u00e1r\u00edt\u00e1s<\/strong> \u00e9s a teljes\u00edtm\u00e9nyoptimaliz\u00e1l\u00e1s<\/strong>. Ha szeretsz adatokkal \u00e9s adatb\u00e1zisokkal dolgozni, strukt\u00far\u00e1ban gondolkodni \u00e9s komplex logikai feladv\u00e1nyokat megoldani, backend oldalon biztosan megtal\u00e1lod a sz\u00e1m\u00edt\u00e1saidat. A Java backend k\u00e9pz\u00e9sen szerezhet\u0151 tud\u00e1s pedig biztos alapokat ny\u00fajt majd sz\u00e1modra.<\/p>\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

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2. \u201e\u00cdrd meg egyszer, futtasd b\u00e1rhol\u201d, avagy mi\u00e9rt nem fog a Java soha kimenni a divatb\u00f3l<\/h2>\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
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A Java jelenleg ez\u00fcst\u00e9rmes a legkeresettebb programnyelvek k\u00f6z\u00f6tt<\/a> az amerikai \u00e9s az eur\u00f3pai piacon. Vil\u00e1gszerte<\/a> mintegy t\u00edzmilli\u00f3 fejleszt\u0151 haszn\u00e1lja \u00e9s 56 milli\u00e1rd eszk\u00f6z\u00f6n fut. Ez nem v\u00e9letlen; a Java backend tud\u00e1s olyan univerz\u00e1lis, amit mindenhol is haszn\u00e1lni<\/strong> lehet. A Jav\u00e1t a Sun Microsystems kezdte fejleszteni<\/a> az 1990-es \u00e9vek elej\u00e9t\u0151l, m\u00e9ghozz\u00e1 interneten fut\u00f3 programok k\u00e9sz\u00edt\u00e9s\u00e9hez. Mivel az internethez szinte b\u00e1rmilyen eszk\u00f6z csatlakozhat, a programok \u00edr\u00e1s\u00e1hoz olyan hordozhat\u00f3 nyelvre volt sz\u00fcks\u00e9g, amit mindegyik besz\u00e9l \u2013 vagy legal\u00e1bbis meg\u00e9rt.<\/p>\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

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A megold\u00e1s?<\/strong> A Java ford\u00edt\u00f3program a forr\u00e1sk\u00f3db\u00f3l csak b\u00e1jtk\u00f3dot \u00e1ll\u00edt el\u0151, nem k\u00f6zvetlen\u00fcl futtathat\u00f3 g\u00e9pi k\u00f3dot. Ezt a k\u00f6ztes k\u00f3dot a sz\u00e1m\u00edt\u00f3g\u00e9pek a JVM, azaz a Java virtu\u00e1lis g\u00e9p (Java Virtual Machine) seg\u00edts\u00e9g\u00e9vel ford\u00edtj\u00e1k le a saj\u00e1t k\u00f3djukra. Ez azt jelenti, hogy ha \u00edrsz Jav\u00e1ban egy programot, azt b\u00e1rhol tudod futtatni<\/strong>, amire l\u00e9tezik JVM. Java virtu\u00e1lis g\u00e9p pedig m\u00e1ra majdnem mindenre el\u00e9rhet\u0151 \u00e9s ingyenesen let\u00f6lthet\u0151, legyen az asztali sz\u00e1m\u00edt\u00f3g\u00e9p, ATM, okost\u00e9v\u00e9 vagy p\u00e9nzt\u00e1rg\u00e9p. S\u0151t, mivel a verzi\u00f3k k\u00f6z\u00f6tt k\u00f6nny\u0171 v\u00e1ltani, egy Jav\u00e1ban meg\u00edrt program<\/a> ak\u00e1r \u00e9vtizedekkel k\u00e9s\u0151bb is m\u0171k\u00f6d\u0151k\u00e9pes.<\/p>\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

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3. Az Amazont\u00f3l a NASA-ig b\u00e1rmilyen c\u00e9gnek sz\u00fcks\u00e9ge lehet r\u00e1d \u00e9s Java backend tud\u00e1sodra<\/h2>\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
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A Javaval nemcsak egy program lesz k\u00e9pes szinte b\u00e1rmire<\/strong>, hanem az \u00edr\u00f3ja is.<\/p>

A Fortune Global 500-as list\u00e1j\u00e1n szerepl\u0151 c\u00e9gek 90 sz\u00e1zal\u00e9ka haszn\u00e1lja<\/a> ezt a nyelvet, k\u00f6zt\u00fck az Alphabet, az Amazon, az Airbnb, a Netflix \u00e9s az Uber. A NASA 2004-ben<\/a> a Mars Exploration Rover program els\u0151, Spirit n\u00e9vre hallgat\u00f3 robotj\u00e1nak ir\u00e1ny\u00edt\u00e1s\u00e1ra vetette be, de Jav\u00e1ban \u00edr\u00f3dott<\/a> (\u00fajra) az \u0171rkutat\u00f3 int\u00e9zet ny\u00edlt forr\u00e1sk\u00f3d\u00fa virtu\u00e1lis f\u00f6ldg\u00f6mb API-ja, a WorldWind is. A nyelv elterjedtebb, \u201ef\u00f6ldi\u201d felhaszn\u00e1l\u00e1si ter\u00fcletei k\u00f6z\u00e9 tartozik az asztali \u00e9s mobilalkalmaz\u00e1sok<\/strong> szerveroldali fejleszt\u00e9se, k\u00fcl\u00f6n\u00f6sen, ha big dat\u00e1r\u00f3l vagy az Androidodr\u00f3l van sz\u00f3.<\/p>

Mivel k\u00e9pes hatalmas mennyis\u00e9g\u0171 adat biztons\u00e1gos kezel\u00e9s\u00e9re, a p\u00e9nz\u00fcgyi szektor is nagy rajong\u00f3ja. A bankok, a t\u0151zsd\u00e9k \u00e9s a fizet\u00e9si szolg\u00e1ltat\u00f3k is el\u0151szeretettel alkalmaznak Java backend tapasztalattal rendelkez\u0151 szakembereket.<\/p>\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

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"java_mars_expedicio_nasa\"\t\t\t\t\t\t\t\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
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A nyelv alapverzi\u00f3ja, a Java SE (Standard Edition) szerveren \u00e9s munka\u00e1llom\u00e1sokon futtathat\u00f3 programok, a Java EE (Enterprise Edition) pedig v\u00e1llalati szerveralkalmaz\u00e1sok fejleszt\u00e9sre k\u00e9sz\u00fclt, mint p\u00e9ld\u00e1ul az \u00fcgyf\u00e9lkezel\u0151 (CRM) vagy az er\u0151forr\u00e1s-tervez\u0151 (ERP) rendszerek. A Java ME (Micro Edition) a k\u00fcl\u00f6nb\u00f6z\u0151 mobil- \u00e9s be\u00e1gyazott eszk\u00f6z\u00f6k\u00f6n \u2013 p\u00e9ld\u00e1ul set-top boxokon vagy nyomtat\u00f3kon \u2013 fut\u00f3 alkalmaz\u00e1sok fejleszt\u00e9s\u00e9re van hangolva, \u00edgy Java a dolgok internetj\u00e9nek (Internet of things vagy IoT) is ide\u00e1lis technol\u00f3giai h\u00e1tteret biztos\u00edt.<\/strong><\/p>\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

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4. Java backenden j\u00f3val t\u00f6bbet tanulsz, mint egy programnyelvet<\/h2>\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
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A Java gyorsan \u00e9s k\u00f6nnyen haszn\u00e1lhat\u00f3<\/b> \u2013 \u00e9s tanulhat\u00f3 is. \u00c9ppen ez\u00e9rt a legt\u00f6bb helyen, k\u00f6zt\u00fck a Codecool iskol\u00e1iban is ezen a nyelven kereszt\u00fcl tan\u00edtjuk meg a di\u00e1koknak az objektumalap\u00fa programoz\u00e1st (a C# mellett).<\/p>

A Java egy tiszt\u00e1n objektumorient\u00e1lt programoz\u00e1si nyelv<\/strong>, vagyis megk\u00f6veteli, hogy a k\u00f3dot egys\u00e9gekbe, azaz objektumokba \u00e9s oszt\u00e1lyokba szervezz\u00fck. Az \u00edgy l\u00e9trej\u00f6tt program m\u0171k\u00f6d\u00e9se val\u00f3j\u00e1ban ezeknek az egys\u00e9geknek a kommunik\u00e1ci\u00f3j\u00e1n alapul. Ennek rengeteg el\u0151nye van a hagyom\u00e1nyos, procedur\u00e1lis programoz\u00e1ssal szemben: a k\u00f3d k\u00f6nnyebben k\u00f6vethet\u0151, \u00fajrahaszn\u00e1lhat\u00f3, jav\u00edthat\u00f3 \u00e9s karbantarthat\u00f3 lesz.<\/p>

Ha Jav\u00e1t tanulsz, azt is elsaj\u00e1t\u00edtod, hogy hogyan tudsz egyszerre sz\u00e9pen \u00e9s hat\u00e9konyan k\u00f3dolni<\/strong>. \u00c9s persze gyorsan, hiszen az elm\u00falt h\u00e1rom \u00e9vtized alatt egy csom\u00f3 olyan k\u00fcls\u0151 csomagot \u00e9s programot \u00edrtak m\u00e1r hozz\u00e1, amiket csak le kell t\u00f6lteni \u00e9s felhaszn\u00e1lni a benn\u00fck szerepl\u0151 alapvet\u00e9seket. Kezd\u0151 programoz\u00f3k\u00e9nt Java backend-tud\u00e1ssal er\u0151s alapra tehetsz szert<\/strong> a programoz\u00f3karrieredhez, amivel k\u00e9s\u0151bb k\u00f6nnyen \u00e1t- vagy tov\u00e1bbk\u00e9pezheted magad<\/p>\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

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"java_backend_k\u00e9pz\u00e9s_codecool\"\t\t\t\t\t\t\t\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
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A Java backend k\u00e9pz\u00e9s\u00fcnk\u00f6n<\/a> azonban enn\u00e9l is t\u00f6bbet tanulhatsz, kezdve az agilis fejleszt\u00e9s alapjaival: a Gittel \u00e9s a Scrummal. Ezut\u00e1n j\u00f6nnek a Java-alapok<\/strong>, vagyis a v\u00e1ltoz\u00f3k, f\u00fcggv\u00e9nyek, adatt\u00edpusok, vez\u00e9rl\u00e9si szerkezetek \u00e9s a clean code alapelvei. A m\u00e1sodik h\u00f3napt\u00f3l r\u00e1t\u00e9r\u00fcnk az olyan OOP-alapelvek<\/strong>re, mint a polimorfizmus, az adatrejt\u00e9s vagy az egys\u00e9gbez\u00e1r\u00e1s, majd a m\u00e9lyebb Java-ismeretek<\/strong>re. V\u00e9g\u00fcl \u00e1tvessz\u00fck a tesztel\u00e9st \u00e9s a t\u00e1bl\u00e1zatkezel\u00e9st SQL<\/strong>-ben.<\/p>

Mi v\u00e1r a k\u00e9pz\u00e9s ut\u00e1n?<\/strong> Junior fejleszt\u0151k\u00e9nt havi brutt\u00f3 450 000-550 000 forint kezd\u0151 fizet\u00e9sre sz\u00e1m\u00edthatsz, k\u00e9t \u00e9v ut\u00e1n<\/strong> pedig brutt\u00f3 650 000-800 000 forintra<\/strong>. Legal\u00e1bbis itthon. A Glassdoor \u00f6sszes\u00edt\u00e9se alapj\u00e1n az amerikai Java-fejleszt\u0151k<\/a> p\u00e9ld\u00e1ul \u00e1tlagosan \u00e9vi 93 118 doll\u00e1rt (33 512 330 Ft) vihetnek haza, a munk\u00e1juk pedig a kilencedik legmen\u0151bb<\/a> az \u00f6sszes k\u00f6z\u00fcl a kompenz\u00e1ci\u00f3t, az el\u00e9rhet\u0151 poz\u00edci\u00f3k sz\u00e1m\u00e1t \u00e9s a szakm\u00e1ban dolgoz\u00f3k el\u00e9gedetts\u00e9g\u00e9t figyelembe v\u00e9ve.<\/p>

Jelentkezn\u00e9l a Java backend k\u00e9pz\u00e9s\u00fcnkre<\/a> vagy tov\u00e1bbi k\u00e9rd\u00e9sed van? Itt a helyed.<\/p>\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":"

Kib\u0151l lesz j\u00f3 backendes? Mennyire neh\u00e9z a Java? \u00c9s mire j\u00f3 a Java-programoz\u00e1s egy\u00e1ltal\u00e1n? Az inf\u00f3estjeinken rendszeresen halljuk t\u0151letek ezeket a k\u00e9rd\u00e9seket, ez\u00e9rt \u00fagy d\u00f6nt\u00f6tt\u00fcnk, \u00f6sszeszedj\u00fck egy helyen, amit a Jav\u00e1r\u00f3l \u00e9s a Codecool Java backend k\u00e9pz\u00e9s\u00e9r\u0151l tudni \u00e9rdemes. \u00cdme!<\/p>\n","protected":false},"author":8,"featured_media":39808,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[128,406,127],"tags":[420,421,418,422,380,419],"class_list":["post-39785","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programozas-hu","category-technologia","category-trendek-hu","tag-java-backend","tag-java-kepzes","tag-java-programozas","tag-java-programozas-codecool","tag-programnyelvek-hu","tag-technologiak"],"yoast_head":"\nN\u00e9gy ok, mi\u00e9rt v\u00e1gj bele egy Java backend k\u00e9pz\u00e9sbe 2022-ben - Codecool<\/title>\n<meta name=\"description\" content=\"\u00d6sszeszedt\u00fck, amit a Jav\u00e1r\u00f3l \u00e9s a Codecool Java backend k\u00e9pz\u00e9s\u00e9r\u0151l tudni \u00e9rdemes. 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