Java - How to merge, append and prepend arrays?

Java Arrays Java 

This example shows how to merge two arrays into a new array. We can also append or prepend new elements using our merge method.

package com.logicbig.example;

import java.lang.reflect.Array;
import java.util.Arrays;

public class ArrayMerge {

    public static <T> T[] merge(T[] a, T[] b) {
        int aLen = a.length;
        int bLen = b.length;

        @SuppressWarnings("unchecked")
        T[] c = (T[]) Array.newInstance(a.getClass().getComponentType(), aLen + bLen);
        System.arraycopy(a, 0, c, 0, aLen);
        System.arraycopy(b, 0, c, aLen, bLen);
        return c;
    }

    public static <T> T[] append(T[] a, T... b) {
        return merge(a, b);
    }

    public static <T> T[] prepend(T[] a, T... b) {
        return merge(b, a);
    }

    public static void main(String[] args) {
        Integer[] ints1 = {1, 2, 3};
        Integer[] ints2 = {5, 6, 7};

        //merging
        Integer[] merged = merge(ints1, ints2);
        System.out.println(Arrays.toString(merged));

        //appending
        Integer[] append = append(ints1, 10, 11, 12);
        System.out.println(Arrays.toString(append));

        //prepending
        Integer[] prepend = prepend(ints1, -3, -2, -1);
        System.out.println(Arrays.toString(prepend));
    }
}

[1, 2, 3, 5, 6, 7]
[1, 2, 3, 10, 11, 12]
[-3, -2, -1, 1, 2, 3]