Absolute Difference Between Any Two elements of An Array

import java.util.Arrays;

public class diffBWtwoElements {

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        int a[] = { 5, -3, 7, -2 };

        Arrays.sort(a);

        int diff = Integer.MAX_VALUE;

        for (int i = 0; i < a.length - 1; i++) {

            if (a[i + 1] - a[i] < diff) {

                diff = a[i + 1] - a[i];

            }

        }

        System.out.println(diff);

    }

}