设计模式（12）---备忘录模式

 1 /*
 2  * 原发器类   Originator 
 3  */
 4 public class Role {
 5 
 6     private int level ;
 7     private int life ;
 8     
 9     public Role() {
10         this.level = 1 ;
11         this.life = 100 ;
12     }
13 
14     public int getLevel() {
15         return level;
16     }
17 
18     public void setLevel(int level) {
19         this.level = level;
20     }
21 
22     public int getLife() {
23         return life;
24     }
25 
26     public void setLife(int life) {
27         this.life = life;
28     }
29     
30     //保存状态
31     public RoleMemento save(){
32         return new RoleMemento(this.level,this.life) ;
33     }
34     
35     //恢复状态
36     public void load(RoleMemento memento){
37         this.level = memento.getLevel() ;
38         this.life = memento.getLife() ;
39     }
40     
41     public void display(){
42         System.out.println("当前等级"+this.level+",生命"+this.life);
43     }
44 
45 }

 1 /*
 2  * 备忘录类
 3  */
 4 public class RoleMemento {
 5 
 6     private int level ;
 7     private int life ;
 8     
 9     public RoleMemento() {
10         // TODO Auto-generated constructor stub
11     }
12 
13     public RoleMemento(int level, int life) {
14         this.level = level;
15         this.life = life;
16     }
17     
18     public int getLevel() {
19         return level;
20     }
21 
22     public void setLevel(int level) {
23         this.level = level;
24     }
25 
26     public int getLife() {
27         return life;
28     }
29 
30     public void setLife(int life) {
31         this.life = life;
32     }
33     
34     
35     
36 
37 }

 1 /*
 2  * 负责人类
 3  */
 4 public class Caretaker {
 5 
 6     private RoleMemento memento ;
 7     public Caretaker() {
 8         // TODO Auto-generated constructor stub
 9     }
10     public RoleMemento getMemento() {
11         return memento;
12     }
13     public void setMemento(RoleMemento memento) {
14         this.memento = memento;
15     }
16     
17     
18 
19 }

 1 public class Test {
 2 
 3     public static void main(String[] args) {
 4         Caretaker caretaker = new Caretaker() ;
 5         Role role = new Role() ;
 6         role.display();
 7         
 8         System.out.println("存档");
 9         caretaker.setMemento(role.save());
10         
11         System.out.println("打了一堆小怪后");
12         role.setLevel(3);
13         role.setLife(500);
14         role.display();
15         
16         System.out.println("遇到了一个Boss，然后挂了");
17         System.out.println("读档");
18         role.load(caretaker.getMemento());
19         
20         role.display();
21 
22     }
23 
24 }