反射クラスを用いて配列長を変更する

import java.lang.reflect.Array;

public class ArrayExpand {

public static void main(String[] args) {
    int[] Test = { 1, 2, 3, 4, 5, 6,7 };
    Test = (int[]) expand(Test);
    for (int i = 0; i < Test.length; i++) {
        System.out.println(Test[i]);
    }
}

public static Object expand(Object array) {
    int newLength=1;
    if (array == null) {
        return null;
    }
    Class c = array.getClass();
    if (c.isArray()) {
        int len = Array.getLength(array);// get array length
        if (len >= newLength) {
            return array;
        } else {
            Class cc = c.getComponentType();
            Object newArray = Array.newInstance(cc, newLength);
            System.arraycopy(array, 0, newArray, 0, len);
            return newArray;
        }
    } else {
        System.out.println("is not array");
        throw new ClassCastException("need array");
    }
}
}