challange explanation

Question

What is the output of this code?
Integer i1 = 127;
Integer i2 = 127;
System.out.println(i1 == i2);
i1 = 128;
i2 = 128;
System.out.println(i1 == i2);

why the answer is true false

Answer 1

Additionally Hope these may help you..
https://www.sololearn.com/Discuss/1930263/?ref=app
https://www.sololearn.com/Discuss/2132457/?ref=app

Answer 2

I remember slightly someone mentioned about value caching for Java Integer. As I recall, value of Integer from -128 up to 127 was cached in memory, and its reference is reused when another Integer was created, and assigned a value within that range (-128 ~ 127).

A bit like string pool work for efficiency I guess (cmiiw).

Answer 3

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