Hii, why output is true false in below code ?

Question

Integer a = 127;
Integer b = 127;
System.out.println(a==b);
a=128;
b=128;
System.out.println(a==b);
Please explain

Answer 1

Taking reference from answers in:

https://stackoverflow.com/questions/1700081/

Assigning numeric literals to objects of class Integer implicity calls Integer.valueOf(). The .valueOf method was designed in such a way that values in the range of (-128,128) are "pooled". This means that for values of n between -128 and 128, Integer.valueOf(n) returns the same object for each distinct value of n. If you call Integer.valueOf(127) two times, both calls return the same object.