深度复制2维对象阵列

Question

在我的项目中，我操纵由对象组成的多维数组。操作后，我想“重置”数组。我从这里和全网测试了几十个“深度复制”代码，但似乎没有人使用多维数组。我在Java 7上。你能提供一个提示吗？

通过重置我的意思是在操作之前的初始状态。所以我想创建我的阵列的备份并稍后恢复。

Answer 1

我相信这应该完成有问题的阵列的深层复制。

private static class CloneableObject 
     implements 
      Cloneable { 

    @Override 
    public CloneableObject clone() { 
     return new CloneableObject(); 
    } 
} 


CloneableObject[][] original; 


void someMethod() { 
    CloneableObject[][] copy = Arrays.copyOf(this.original, this.original.length); 
    for (int i = 0; i < copy.length; i++) { 
     copy[i] = Arrays.copyOf(copy[i], copy[i].length); 
     for (int j = 0; j < copy[i].length; j++) { 
      copy[i][j] = copy[i][j].clone(); 
     } 
    } 

    /* 
    * Manipulation of this.original is to be done here 
    * None of the manipulations will be reflected in copy 
    * 
    * Note that (this.original[n][m] == copy[n][m]) will evaluate to false, 
    * where n and m are arbitrary indices of the array. 
    */ 

    this.original = copy; // "reset" 
} 

如果希望Object的实例不被复制，只需删除内部循环即可。