How does Java handle integer underflows and overflows and how would you check for it?

Question

How does Java handle integer underflows and overflows?

Leading on from that, how would you check/test that this is occurring?

Answer 1

It wraps around.

e.g:

public class Test {

    public static void main(String[] args) {
        int i = Integer.MAX_VALUE;
        int j = Integer.MIN_VALUE;

        System.out.println(i+1);
        System.out.println(j-1);
    }
}

prints

-2147483648
2147483647