{"id":10014,"date":"2026-10-24T15:14:26","date_gmt":"2026-10-24T12:14:26","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10008"},"modified":"2026-10-24T15:14:26","modified_gmt":"2026-10-24T12:14:26","slug":"java-nedir-ne-ise-yarar","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/java-nedir-ne-ise-yarar\/","title":{"rendered":"Java Nedir? Ne \u0130\u015fe Yarar ve Nas\u0131l Ba\u015flan\u0131r?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Java, 1995 y\u0131l\u0131nda Sun Microsystems taraf\u0131ndan duyurulan, nesne y\u00f6nelimli ve genel ama\u00e7l\u0131 bir programlama dilidir. Bug\u00fcn Oracle taraf\u0131ndan y\u00f6netilen Java; kurumsal yaz\u0131l\u0131mlarda, Android uygulamalar\u0131nda, bankac\u0131l\u0131k sistemlerinde ve b\u00fcy\u00fck \u00f6l\u00e7ekli sunucu uygulamalar\u0131nda yayg\u0131n olarak kullan\u0131l\u0131r. Bu yaz\u0131da Java&#8217;n\u0131n ne oldu\u011funu, nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 ve ilk program\u0131n\u0131z\u0131 nas\u0131l yazaca\u011f\u0131n\u0131z\u0131 \u00f6\u011freneceksiniz.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Java&#8217;n\u0131n Temel \u00d6zelli\u011fi: Bir Kez Yaz, Her Yerde \u00c7al\u0131\u015ft\u0131r<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java kaynak kodu do\u011frudan makine koduna \u00e7evrilmez. \u00d6nce <strong>bytecode<\/strong> ad\u0131 verilen ara bir bi\u00e7ime derlenir. Bu bytecode, <strong>JVM (Java Virtual Machine)<\/strong> taraf\u0131ndan \u00e7al\u0131\u015ft\u0131r\u0131l\u0131r. Windows, Linux ve macOS i\u00e7in ayr\u0131 JVM&#8217;ler bulundu\u011fundan ayn\u0131 derlenmi\u015f program farkl\u0131 sistemlerde \u00e7al\u0131\u015fabilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">JDK, JRE ve JVM Fark\u0131<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>JVM:<\/strong> Bytecode&#8217;u \u00e7al\u0131\u015ft\u0131ran sanal makinedir.<\/li>\n\n<li><strong>JRE:<\/strong> JVM ve gerekli k\u00fct\u00fcphaneleri i\u00e7eren \u00e7al\u0131\u015fma ortam\u0131d\u0131r.<\/li>\n\n<li><strong>JDK:<\/strong> JRE&#8217;ye ek olarak derleyici (<code>javac<\/code>) gibi geli\u015ftirme ara\u00e7lar\u0131n\u0131 i\u00e7erir. Program yazmak i\u00e7in JDK kurman\u0131z gerekir.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Kurulum ve Kontrol<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">G\u00fcncel bir JDK s\u00fcr\u00fcm\u00fcn\u00fc (\u00f6rne\u011fin Oracle JDK veya OpenJDK da\u011f\u0131t\u0131mlar\u0131ndan biri) kurduktan sonra terminalde \u015fu iki komutu \u00e7al\u0131\u015ft\u0131r\u0131n:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>java -version\njavac -version<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130kisi de bir s\u00fcr\u00fcm numaras\u0131 d\u00f6nd\u00fcr\u00fcyorsa kurulum tamamd\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0130lk Java Program\u0131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Merhaba.java<\/code> ad\u0131nda bir dosya olu\u015fturun:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class Merhaba {\n    public static void main(String[] args) {\n        System.out.println(\"Merhaba D\u00fcnya\");\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Kodun anlam\u0131 \u015f\u00f6yledir:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>public class Merhaba<\/code> bir s\u0131n\u0131f tan\u0131mlar. Dosya ad\u0131, <code>public<\/code> s\u0131n\u0131f\u0131n ad\u0131yla ayn\u0131 olmal\u0131d\u0131r.<\/li>\n\n<li><code>public static void main(String[] args)<\/code> program\u0131n giri\u015f noktas\u0131d\u0131r. Java \u00e7al\u0131\u015fmaya buradan ba\u015flar.<\/li>\n\n<li><code>System.out.println()<\/code> ekrana yaz\u0131 yazar ve sat\u0131r sonuna ge\u00e7er.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Derleme ve \u00c7al\u0131\u015ft\u0131rma<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>javac Merhaba.java\njava Merhaba<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130lk komut <code>Merhaba.class<\/code> ad\u0131nda bytecode dosyas\u0131 \u00fcretir. \u0130kinci komut bu dosyay\u0131 JVM \u00fczerinde \u00e7al\u0131\u015ft\u0131r\u0131r. Dikkat: <code>java<\/code> komutuna dosya uzant\u0131s\u0131 yaz\u0131lmaz.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">De\u011fi\u015fkenler ve Veri T\u00fcrleri<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Java <strong>statik t\u00fcr<\/strong>l\u00fc bir dildir. Her de\u011fi\u015fkenin t\u00fcr\u00fcn\u00fc ba\u015ftan belirtmeniz gerekir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int yas = 30;\ndouble boy = 1.75;\nboolean ogrenciMi = false;\nString isim = \"Yunus\";<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Python&#8217;dan farkl\u0131 olarak yanl\u0131\u015f t\u00fcrde de\u011fer atamaya \u00e7al\u0131\u015f\u0131rsan\u0131z program derleme a\u015famas\u0131nda hata verir. Bu, hatalar\u0131 erken yakalaman\u0131za yard\u0131mc\u0131 olur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ko\u015ful ve D\u00f6ng\u00fc<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>int puan = 72;\n\nif (puan &gt;= 50) {\n    System.out.println(\"Ge\u00e7tiniz\");\n} else {\n    System.out.println(\"Kald\u0131n\u0131z\");\n}\n\nfor (int i = 1; i &lt;= 5; i++) {\n    System.out.println(i);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Java&#8217;da bloklar s\u00fcsl\u00fc parantezlerle belirlenir ve her komut noktal\u0131 virg\u00fclle biter.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Temelleri \u00f6\u011frendikten sonra s\u0131rayla diziler, metotlar, s\u0131n\u0131flar ve nesneler, kal\u0131t\u0131m, aray\u00fczler ve koleksiyonlar konular\u0131na ge\u00e7in. Bir geli\u015ftirme ortam\u0131 kullanmak i\u015finizi kolayla\u015ft\u0131r\u0131r. IntelliJ IDEA, Eclipse ve VS Code bu i\u015f i\u00e7in yayg\u0131n se\u00e7eneklerdir. Her konuda k\u00fc\u00e7\u00fck bir program yazarak ilerlemek, \u00f6\u011frenmenin en sa\u011flam yoludur.<\/p>","protected":false},"excerpt":{"rendered":"<p>Java&#8217;n\u0131n ne oldu\u011funu, JDK ile JVM fark\u0131n\u0131 ve ilk program\u0131n\u0131z\u0131 nas\u0131l derleyip \u00e7al\u0131\u015ft\u0131raca\u011f\u0131n\u0131z\u0131 \u00f6\u011frenin.<\/p>","protected":false},"author":1,"featured_media":10013,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[227],"tags":[208,245,247,248,214],"class_list":["post-10014","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","tag-baslangic","tag-java","tag-jdk","tag-jvm","tag-programlama"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Java Nedir? 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