On virtual machines and expected behaviour

Ever tried running this on your ENTERPRISE VIRTUAL MACHINE?
Integer a = 1000;
 Integer b = 1000;
 System.out.println("a == b (1000 == 1000): " + (a == b));

 Integer aa = 100;
 Integer bb = 100;
 System.out.println("aa == bb (100 == 100): " + (aa == bb));
Guess what's the output, run it and report back.

>>15
Backward compatibility only explains why it isn't fixed now. It doesn't explain why it was done that way in the first place. It was just as bad an idea in Java 1.5, when it was introduced, as it is now, in Java 1.6.