拷贝对象和原始对象的引用类型引用同一个对象。

    1. public class ShallowCloneExample implements Cloneable {
    3.     private int[] arr;
    5.     public ShallowCloneExample() {
    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 ShallowCloneExample clone() throws CloneNotSupportedException {
    22.         return (ShallowCloneExample) super.clone();
    23.     }
    24. }
    25. ShallowCloneExample e1 = new ShallowCloneExample();
    26. ShallowCloneExample e2 = null;
    27. try {
    28.     e2 = e1.clone();
    29. } catch (CloneNotSupportedException e) {
    30.     e.printStackTrace();
    31. }
    32. e1.set(2, 222);
    33. System.out.println(e2.get(2)); // 222