Mystery Program with Swap

import java.util.Arrays;
import java.util.stream.Collectors;

public class Driver {
    public static void main(String[] args) {
        int[] x = {3, 1, 5, 2, 4};
        int a = 0;
        for (int index = 0; index < x.length - 1; index++) {
            if (x[index] > x[index + 1]) {
                a = x[index];
                x[index] = x[index + 1];
                x[index + 1] = a;
            }
        }
        System.out.println("x = " + Arrays.stream(x).boxed().collect(Collectors.toList()));
    }
}