Custom Array copyOf

ArrayCopyOf.java

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

public class Sandbox {
	public static Object arrayCopyOf(Object arr, int newLen) {
		Class cl = arr.getClass();
		if (!cl.isArray()) { return null; }
		Class componentType = cl.getComponentType();
		int length = Array.getLength(arr);
		Object newArray = Array.newInstance(componentType, newLen);
		System.arraycopy(arr, 0, newArray, 0, Math.min(length, newLen));
		return newArray;
	}
	
	public static void main(String[] args) {
		int[] arr = {1,2,3,4};
		int[] arr2 = (int[]) arrayCopyOf(arr, 3);
		int[] arr3 = Arrays.copyOf(arr, 3);
		
		System.out.println(Arrays.toString(arr));
		System.out.println(Arrays.toString(arr2));
		System.out.println(Arrays.toString(arr3));

	}
}