Java IntegerCache

//jeste ovo znali? xd
Integer a = 12;
Integer b = 12;
Integer c = 12;
Integer d = 12;

System.out.println("a==b :" + ( a == b); // isti objekat

// SVE JE ISTI OBJEKAT
System.out.println("a == b && a == c" +  (a==b && a == c));

Integer e = 200;
Integer f = 200;

// NISU ISTI OBJEKTI!
System.out.println(" e == f "  + (e == f));

//http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8-b132/java/lang/Integer.java#Integer.IntegerCache