创建型---prototype模式

• 代码：

 1 package com.design;
 2 import java.util.ArrayList;
 3
 4 /**
 5  *
 6  * @author Administrator
 7  *
 8  */
 9 class ConcretePrototype implements Cloneable {
10     /**
11      * 成员变量
12      * namelist 测试深拷贝
13      */
14     private ArrayList<String> nameList = new ArrayList<String>();
15
16     /**
17      * 构造函数
18      */
19     public ConcretePrototype() {
20       }
21
22     /**
23      * 添加name到namelist
24      * @param name
25      */
26     public void setName(String name) {
27         this.nameList.add(name);
28       }
29
30      /**
31       *  获取namelist
32       * @return
33       */
34      public ArrayList<String> getNameList() {
35         return this.nameList;
36       }
37
38      /**
39       * 覆盖Object基类中的clone()方法，并扩大该方法的访问权限，具体化返回本类型
40       */
41      public ConcretePrototype clone() {
42
43         ConcretePrototype self = null;
44         try
45         {
46             self = (ConcretePrototype) super.clone();
47             ///以下这句是实现深拷贝的关键
48             self.nameList = (ArrayList<String>) this.nameList.clone();
49         }
50         catch(CloneNotSupportedException e)
51         {
52             e.printStackTrace();
53         }
54
55         return self;
56       }
57 }
58
59 //测试类
60 public class Test {
61       public static void main(String[] args) {
62         ConcretePrototype prototype = new ConcretePrototype();
63         prototype.setName("蚂蚁 ...");
64         System.out.println("prototype : " + prototype.getNameList());
65
66         ///通过clone获得一个拷贝
67         ConcretePrototype fromClone = prototype.clone();
68         fromClone.setName("小蚂蚁 ...");
69         System.out.println("fromClone : " + fromClone.getNameList());
70         System.out.println("prototype : " + prototype.getNameList());
71       }
72 }

• 结果：

prototype : [蚂蚁 ...]
fromClone : [蚂蚁 ..., 小蚂蚁 ...]
prototype : [蚂蚁 ...]