java how to merge two arrays

/**
 * @author lautturi.com
 * Java example: merge two arrays in java
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {

		int[] x = { 1, 2, 3 };
		int[] y = { 4, 5, 6 };
		int[] merge = new int[x.length + y.length];

		for (int i = 0; i < x.length; i++) {
			merge[i] += x[i];
		}

		for (int i = 0; i < y.length; i++) {
			merge[x.length + i] += y[i];
		}

		System.out.println(Arrays.toString(merge));
	}
}

output:

[1, 2, 3, 4, 5, 6]