如何在java中克隆多维数组？

参见英文答案 > How do I do a deep copy of a 2d array in Java?????????????????????????????????????6个
编辑2：下面是一个基于DuffyMo响应的代码片段,演示了如何使用System.arraycopy克服多维数组克隆的局限性.

import java.util.Arrays;

public class Randar {
public static int[][] arrayMaster = {{6,1},{10,{1,1}};
private static int[][] arrayChanges = new int[arrayMaster.length][2];

public Randar () {

}
public static void main(String[] args) {
    arrayChanges[0][0] = 0;
    resetArrays(arrayChanges,arrayMaster);
    arrayChanges[0][0] = 0;

    System.out.format("arrayMaster: %s,arrayChanges: %s",Arrays.deepToString(arrayMaster),Arrays.deepToString(arrayChanges));
}


public static void resetArrays(int[][] arrayChanges,int[][] arrayMaster) {
for (int a=0; a< arrayMaster.length; a++) {
System.arraycopy(arrayMaster[a],arrayChanges[a],arrayMaster[a].length);
}
// arrayChanges = arrayMaster.clone(); will NOT work as expected
}
}

[原始问题]
在Java中(完全)克隆多维数组的简单方法是什么？这个程序说明了我的问题.

import java.util.Arrays;

public class Randar {
public static int[][] arrayMaster = {{6,1}};
static private int[][] arrayChanges = arrayMaster;

public static void main(String[] args) {
    arrayChanges[0][0] = 0;
    resetArrays();

    System.out.format("arrayMaster: %s,Arrays.deepToString(arrayChanges));
}


public static void resetArrays() {
arrayChanges = arrayMaster.clone();
}

}

运行上面的代码时,arrayMaster和arrayChanges一样会改变,这与我的意图相反.认为我可以克隆arrayMaster的每个单维数组成员,我试图解决这个问题：

for (int iter = 0; iter < arrayMaster.length; iter++) {
    arrayChanges[iter] = arrayMaster[iter].clone();
    }

但是当我运行由于某种原因而给出NullPointerException的代码时.编写一个循环遍历数组的各个整数值的方法是我唯一的选择吗？

谢谢.

编辑1：这也不能解决问题.

import java.util.Arrays;

public class Randar {
public int[][] arrayMaster = {{6,1}};
private int[][] arrayChanges = arrayMaster.clone();

public Randar () {

}
public static void main(String[] args) {
    Randar Randar1 = new Randar();
    Randar1.arrayChanges[0][0] = 0;
    resetArrays(Randar1.arrayChanges,Randar1.arrayMaster);
    Randar1.arrayChanges[0][0] = 0;

    System.out.format("arrayMaster: %s,Arrays.deepToString(Randar1.arrayMaster),Arrays.deepToString(Randar1.arrayChanges));
}


public static void resetArrays(int[][] arrayChanges,int[][] arrayMaster) {
/*for (int a=0; a< arrayMaster.length; a++) {
System.arraycopy(arrayMaster[a].clone(),arrayMaster[a].length);
} */
arrayChanges = arrayMaster.clone();
}
}

static private int[][] arrayChanges = arrayMaster;

public static int[][] deepCopyIntMatrix(int[][] input) {
    if (input == null)
        return null;
    int[][] result = new int[input.length][];
    for (int r = 0; r < input.length; r++) {
        result[r] = input[r].clone();
    }
    return result;
}