Why == for Integer.valueOf (500) returns false but true for 5?

Question

System.out.println(Integer.valueOf(5) == Integer.valueOf(5));
System.out.println(Integer.valueOf(500) == Integer.valueOf(500));

Output signal

true
false

Why does the first line return true and the second line return false? What a trick here, since both calls are valueOf()

in class Integer

.

+3

OneZero 28 oct. 14 at 19:48

1 answer

NESPowerGlove · Accepted Answer · 2014-10-28T19:49:15+0000

There are cached instances of objects with a zero Integer, but not any objects with a higher Integer.

If you haven't noticed before, you are comparing objects, not ints.