Some issues with Autoboxing

Integer j1 = 127;
Integer j2 = 127;
System.out.println( j1==j2); //Works!!!
Integer k1 = 128;
Integer k2 = 128;
System.out.println( k1==k2); //Doesn't Work!!!
Integer w1 = -128;
Integer w2 = -128;
System.out.println( w1==w2); //Works!!!
Integer m1 = -129;
Integer m2 = -129;
System.out.println( m1==m2); //Doesn't Work!!!

This gives us similarity to constant string pool.