拷贝对象和原始对象的引用类型引用不同对象。

    1. public class DeepCloneExample implements Cloneable {
    3.     private int[] arr;
    5.     public DeepCloneExample() {
    6.         arr = new int[10];
    7.         for (int i = 0; i < arr.length; i++) {
    8.             arr[i] = i;
    9.         }
    10.     }
    12.     public void set(int index, int value) {
    13.         arr[index] = value;
    14.     }
    16.     public int get(int index) {
    17.         return arr[index];
    18.     }
    20.     @Override
    21.     protected DeepCloneExample clone() throws CloneNotSupportedException {
    22.         DeepCloneExample result = (DeepCloneExample) super.clone();
    23.         result.arr = new int[arr.length];
    24.         for (int i = 0; i < arr.length; i++) {
    25.             result.arr[i] = arr[i];
    26.         }
    27.         return result;
    28.     }
    29. }
    30. DeepCloneExample e1 = new DeepCloneExample();
    31. DeepCloneExample e2 = null;
    32. try {
    33.     e2 = e1.clone();
    34. } catch (CloneNotSupportedException e) {
    35.     e.printStackTrace();
    36. }
    37. e1.set(2, 222);
    38. System.out.println(e2.get(2)); // 2