Boundary of 127 for integers in Java

Asked Aug 22 '19 at 18:27

Active Aug 22 '19 at 18:34

Viewed 26 times

Out of curiosity: why do we have FALSE when the integer is greater than 127, for Integers?

public class Main {
    public static void main(String[] args) {
        System.out.println(127 == 127); // case 1: true
        System.out.println(128 == 128); // case 2: true
        System.out.println(Integer.valueOf(127) == Integer.valueOf(127)); // case 3: true
        System.out.println(Integer.valueOf(128) == Integer.valueOf(128)); // case 4: FALSE
    }
}

edited Aug 22 '19 at 18:34

John Kugelman

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asked Aug 22 '19 at 18:27

Topera

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You shouldn't compare `Integer` with `==` use `equals` instead – Butiri Dan Aug 22 '19 at 18:31
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[It's in the documentation of `Integer.valueOf`](https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#valueOf(int)). – Andy Turner Aug 22 '19 at 18:46

Boundary of 127 for integers in Java

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