package com.test.flyweight;

 /**

  * FlyWeight抽象享元类

  */

 public interface ChessFlyWeight {

     void setColor(String c);

     String getColor();

     void display(Coordinate c);

 }

 /**

  * ConcreteFlyWeight具体享元类

  */

 class ConcreteChess implements ChessFlyWeight {

     private String color;

     public ConcreteChess(String color) {

         super();

         this.color = color;

     }

     @Override

     public void setColor(String c) {

         this.color = c;

     }

     @Override

     public String getColor() {

         return color;

     }

     @Override

     public void display(Coordinate c) {

         System.out.println("棋子颜色："+color);

         System.out.println("棋子位置："+c.getX()+"------"+c.getY());

     }

 }

 package com.test.flyweight;

 /**

  * 外部状态UnSharedConcreteFlyWeight非共享享元类

  */

 public class Coordinate {

     private int x,y;

     public Coordinate(int x, int y) {

         super();

         this.x = x;

         this.y = y;

     }

     public int getX() {

         return x;

     }

     public void setX(int x) {

         this.x = x;

     }

     public int getY() {

         return y;

     }

     public void setY(int y) {

         this.y = y;

     }

 }

package com.test.flyweight;

import java.util.HashMap;

import java.util.Map;

/**

 * 享元工厂类

 */

public class ChessFlyWeightFactory {

    //享元池

    private static Map<String, ChessFlyWeight> map = new HashMap<String, ChessFlyWeight>();

    public static ChessFlyWeight getChess(String color) {

        if(map.get(color)!=null){

            return map.get(color);

        }else{

            ChessFlyWeight cfw = new ConcreteChess(color);

            map.put(color, cfw);

            return cfw;

        }

    }

}

 package com.test.flyweight;

 public class Client {

     public static void main(String[] args) {

         ChessFlyWeight chess1 = ChessFlyWeightFactory.getChess("黑色");

         ChessFlyWeight chess2 = ChessFlyWeightFactory.getChess("黑色");

         System.out.println(chess1);

         System.out.println(chess2);

         System.out.println("增加外部状态的处理============");

         chess1.display(new Coordinate(10,10));

         chess2.display(new Coordinate(20,20));

     }

 }

控制台输出：

com.test.flyweight.ConcreteChess@1db9742

com.test.flyweight.ConcreteChess@1db9742

增加外部状态的处理============

棋子颜色：黑色

棋子位置：10------10

棋子颜色：黑色

棋子位置：20------20