Clone

 1 package demos;
 2 
 3 import java.util.Date;
 4 
 5 public class CloneTest implements Cloneable {
 6     private int id;
 7     private String name;
 8     private Date birday;
 9 
10     public CloneTest() {
11     }
12 
13     public CloneTest(int id, String name, Date birday) {
14         this.id = id;
15         this.name = name;
16         this.birday = birday;
17     }
18 
19     @Override
20     public String toString() {
21         return "[" + id + "-" + name + "-" + birday + "]";
22     }
23 
24     // 重写clone方法可以对克隆过程做更多处理,返回类型可以为CloneTest(父类为Object)
25     // 
26     @Override
27     public CloneTest clone() {
28         CloneTest c = null;
29         try {
30             c = (CloneTest) super.clone();
31             //引用对象需要独立拷贝
32             c.birday = (Date) birday.clone();
33         } catch (CloneNotSupportedException e) {
34             e.printStackTrace();
35         }
36         
37         return c;
38     }
39 
40     public static void main(String[] args) throws CloneNotSupportedException {
41         CloneTest a = new CloneTest(11, "Jack", new Date());
42         CloneTest b = (CloneTest) a.clone();
43         System.out.println(a);
44         System.out.println(b);
45     }
46 
47 }