享元模式-java

package u13;
class Coordinates {

    private int x;
    private int y;

    public Coordinates(int x, int y) {
        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 u13;
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";
    }

}

package u13;

import java.util.Hashtable;

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);
    }
}

package u13;

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, 2));
        black2.locate(new Coordinates(3, 4));
        black3.locate(new Coordinates(1, 3));
        white1.locate(new Coordinates(2, 5));
        white2.locate(new Coordinates(2, 4));
    }
}