12.17

本次实验属于模仿型实验，通过本次实验学生将掌握以下内容：

1、理解享元模式的动机，掌握该模式的结构；

2、能够利用享元模式解决实际问题。

 

[实验任务一]：围棋

设计一个围棋软件，在系统中只存在一个白棋对象和一个黑棋对象，但是它们可以在棋盘的不同位置显示多次。

实验要求：

1.提交类图；

2.提交源代码；

3.注意编程规范；

4.要求用简单工厂模式和单例模式实现享元工厂类的设计。

 

 

 

 

/**

 * 客户端测试类

 *

 */public class Client {

    public static void main(String[] args) {

        IgoChessman black1,black2,black3,white1,white2;

        IgoChessmanFactory factory;

        factory = IgoChessmanFactory.getInstance();

        black1 = factory.getIgoChessman("b");

        black2 = factory.getIgoChessman("b");

        black3 = factory.getIgoChessman("b");

        System.out.println("判断两颗黑棋是否相同："+(black1==black2));

 

        white1 = factory.getIgoChessman("w");

        white2 = factory.getIgoChessman("w");

        System.out.println("判断两颗白棋是否相同："+(white1==white2));

 

        black1.locate(new Coordinates(1, 1));

        black2.locate(new Coordinates(2, 4));

        black3.locate(new Coordinates(2, 3));

        white1.locate(new Coordinates(3, 5));

        white2.locate(new Coordinates(2, 6));

    }

 

}

/**

 * 坐标类：外部状态类

 *

 */public class Coordinates {

    private int x;

    private int y;

 

    public Coordinates(int x,int y) {

        // TODO Auto-generated constructor stub

        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;

    }

 

}

/**

 * 围棋棋子类：抽象享元类

 *

 */public abstract class IgoChessman {

    public abstract String getColor();

    public void locate(Coordinates coord){

        System.out.println("棋子颜色："+this.getColor()+",棋子位置："+coord.getX()+","+coord.getY());

    }

}/**

 * 黑色棋子类：具体享元类

 * @author fly

 *

 */class BlackIgoChessman extends IgoChessman{

 

    @Override

    public String getColor() {

        // TODO Auto-generated method stub

        return "黑色";

    }

 

}/**

 * 白色棋子类：具体享元类

 * @author fly

 *

 */class WhiteIgoChessman extends IgoChessman{

 

    @Override

    public String getColor() {

        // TODO Auto-generated method stub

        return "白色";

    }

 

}

import java.util.Hashtable;

/**

 * 围棋棋子工厂类：享元工厂类

 *

 */public class IgoChessmanFactory {

    private static IgoChessmanFactory instance = new IgoChessmanFactory();

    private static Hashtable ht;

 

    public IgoChessmanFactory() {

        // TODO Auto-generated constructor stub

        ht = new Hashtable();

        IgoChessman black,white;

        black = new BlackIgoChessman();

        ht.put("b", black);

        white = new WhiteIgoChessman();

        ht.put("w", white);

    }

 

    public static IgoChessmanFactory getInstance(){

        return instance;

    }

 

    public static IgoChessman getIgoChessman(String color){

        return (IgoChessman)ht.get(color);

    }