How to deep copy an irregular 2D array

int[][] nums =  {{5},
                 {9,4},
                 {1,7,8},
                 {8,3,2,10}}

int[][] copy = new int[nums.length][];

for (int i = 0; i < nums.length; i++) {
	copy[i] = new int[nums[i].length];

	for (int j = 0; j < nums[i].length; j++) {
		copy[i][j] = nums[i][j];
	}
}

private static int[][] copy2d(int[][] nums) {
	int[][] copy = new int[nums.length][];

	for (int i = 0; i < copy.length; i++) {
		int[] member = new int[nums[i].length];
		System.arraycopy(nums[i], 0, member, 0, nums[i].length);
		copy[i] = member;
	}

	return copy;
}

public class ArrayTest extends TestCase {

    public void testArrays() {
        Object arr = new int[][]{
                {5},
                {9, 4},
                {1, 7, 8},
                {8, 3, 2, 10}
        };

        Object arrCopy = copyNd(arr);
        int height = Array.getLength(arr);
        for (int r = 0; r < height; r++) {
            Object rowOrigonal = Array.get(arr, r);
            Object rowCopy = Array.get(arrCopy, r);
            int width = Array.getLength(rowOrigonal);
            for (int c = 0; c < width; c++) {
                assertTrue(rowOrigonal.getClass().isArray());
                assertTrue(rowCopy.getClass().isArray());
                assertEquals(Array.get(rowOrigonal, c), Array.get(rowCopy, c));
                System.out.println(Array.get(rowOrigonal, c) + ":" + Array.get(rowCopy, c));
            }
        }
    }

    public static Object copyNd(Object arr) {
        if (arr.getClass().isArray()) {
            int innerArrayLength = Array.getLength(arr);
            Class component = arr.getClass().getComponentType();
            Object newInnerArray = Array.newInstance(component, innerArrayLength);
            //copy each elem of the array
            for (int i = 0; i < innerArrayLength; i++) {
                Object elem = copyNd(Array.get(arr, i));
                Array.set(newInnerArray, i, elem);
            }
            return newInnerArray;
        } else {
            return arr;//cant deep copy an opac object??
        }
    }
}

public  void testMultiDimArray()
{
   int[][][] arr = new int[][][] {
           { {5}, {5, 6 }, {3, 3, 1} },
           { {1, 2, 3}, {4, 5 } }
   };

   Object[] dest = (Object[]) deepCopy(arr);
   // System.out.println(Arrays.deepToString(dest));
   assertTrue(Arrays.deepEquals(arr, dest));
}

public static Object deepCopy(Object src)
{
    int srcLength = Array.getLength(src);
    Class srcComponentType = src.getClass().getComponentType();

    Object dest = Array.newInstance(srcComponentType, srcLength);

    if (srcComponentType.isArray())
    {
        for (int i = 0; i < Array.getLength(src); i++)
            Array.set(dest, i, deepCopy(Array.get(src, i)));
    }
    else
    {
        System.arraycopy(src, 0, dest, 0, srcLength);
    }

    return dest;
}

public static char[][] cloneArray(char[][] array){
 char[][] copy = new char[array.length][];
 for(int i = 0 ; i < array.length ; i++){
  System.arraycopy(array[i], 0, copy[i] = new char[array[i].length], 0, array[i].length);
 }
 return copy;
}

import java.util.*;

public class ArrayDeepCopy {

    static int[][] clone(int[][] arr) {
        final int L = arr.length;
        int[][] clone = new int[L][];
        for (int i = 0; i < clone.length; i++) {
            clone[i] = (arr[i] == null) ? null : arr[i].clone();
        }
        return clone;
    }

    public static void main(String[] args) {
        int[][] a = {
            { 1, },
            { 2, 3, },
            null,
        };
        int[][] b = a.clone();
        System.out.println(a[0] == b[0]); // "true", meaning shallow as expected!

        b = clone(a); // this is deep clone!
        System.out.println(Arrays.deepEquals(a, b)); // "true"
        System.out.println(a[0] == b[0]); // "false", no longer shallow!
    }
}

//
    // Sort the points array in descending order.
    // [94, 70, 64, 53, 44]
    //
    Arrays.sort(points, Collections.reverseOrder());
    System.out.println(Arrays.toString(points));