Why aren't Integers cached in Java?

Question

I know there are similar posts on the topic, but they don\'t quite address my question. When you do:

Integer a = 10;
Integer b = 10;
System.out.println(\"a =         


        

Answer 1

BTW, If you do

Integer a = 234345;
Integer b = 234345;

if (a == b) {}

it is possible that this will be true.

This is because since you didn't use new Integer(), the JVM (not the class code) is allowed to cache its own copies of Integers if it sees fit. Now you shouldn't write code based on this, but when you say new Integer(234345) you are guaranteed by the spec that you will definitely have different objects.