设计模式之享元模式 FlyWeight

Posted 2020-10-05 大白

 

 代码实现

 1 /**
 2  * 享元工厂类
 3  * @author bzhx
 4  * 2017年3月14日
 5  */
 6 public class ChessFlyWeightFactory {
 7     //享元池
 8     private static Map<String,ChessFlyWeight> map = new HashMap<String,ChessFlyWeight>();
 9     public static ChessFlyWeight getChess(String color){
10         if(map.get(color)!=null){
11             return map.get(color);
12         }else{
13             ChessFlyWeight cfw = new ConcreteChess(color);
14             map.put(color, cfw);
15             return cfw;
16         }
17     }
18 }

享元工厂类

1 public interface ChessFlyWeight {
2 
3     void setColor(String c);
4     String getColor();
5     void display(Coordinate c);
6 }

抽象享元类

 1 //内部状态ConcreteFlyWeight
 2 class ConcreteChess implements ChessFlyWeight{
 3 
 4     private String color;
 5     
 6     public ConcreteChess(String color) {
 7         super();
 8         this.color = color;
 9     }
10 
11     @Override
12     public void setColor(String c) {
13         this.color = c;
14     }
15 
16     @Override
17     public String getColor() {
18         return color;
19     }
20 
21     @Override
22     public void display(Coordinate c) {
23         System.out.println("棋子颜色："+color);
24         System.out.println("棋子位置："+c.getX()+"-----"+c.getY());
25     }
26     
27 }

具体享元类（内部共享）

 1 /**
 2  * 外部状态 UnSharedConcreteFlyWeight
 3  * @author bzhx
 4  * 2017年3月14日
 5  */
 6 public class Coordinate {
 7 
 8     private int x,y;
 9 
10     public Coordinate(int x, int y) {
11         super();
12         this.x = x;
13         this.y = y;
14     }
15 
16     public int getX() {
17         return x;
18     }
19 
20     public void setX(int x) {
21         this.x = x;
22     }
23 
24     public int getY() {
25         return y;
26     }
27 
28     public void setY(int y) {
29         this.y = y;
30     }
31     
32     
33     
34 }

非共享享元类

 1 public class Client {
 2 
 3     public static void main(String[] args) {
 4         ChessFlyWeight chess1 = ChessFlyWeightFactory.getChess("黑色");
 5         ChessFlyWeight chess2 = ChessFlyWeightFactory.getChess("黑色");
 6         System.out.println(chess1);
 7         System.out.println(chess2);
 8         
 9         System.out.println("增加外部状态的处理============================");
10         chess1.display(new Coordinate(10,10));
11         chess2.display(new Coordinate(20,20));
12     }
13 
14 }

测试调用