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

A new instance is a new instance, so they are equal in value, but they are not equal as objects.

So a == b can't return true.

If they were 1 object, as you ask for: a+=2; would add 2 to all int = 10 - that would be awful.