Growing an Array

package example.array;

import java.lang.reflect.Array;

public class ArrayGrowTest {

    public static void main(String[] args) {

	int[] a = { 1, 2, 3 };

	a = (int[]) arrayGrow(a);

	arrayPrint(a);

    }

    static Object arrayGrow(Object a) {

	Class cl = a.getClass();

	if (!cl.isArray())

	    return null;

	Class componentType = a.getClass().getComponentType();

	int length = Array.getLength(a);

	int newLength = length + 10;

	Object newArray = Array.newInstance(componentType, newLength);

	System.arraycopy(a, 0, newArray, 0, length);

	return newArray;

    }

    static void arrayPrint(Object a) {

	Class cl = a.getClass();

	if (!cl.isArray())

	    return;

	Class componentType = a.getClass().getComponentType();

	int length = Array.getLength(a);

	System.out.println(componentType.getName() + "[" + length + "]");

	for (int i = 0; i < length; i++)

	    System.out.println(Array.get(a, i));

    }

}