大三每日总结

软件设计 石家庄铁道大学信息学院

实验13：享元模式
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；
package XiangYuan;

class BlackIgoChessman extends IgoChessman {
public String getColor() {
return "黑色";
}
}
package XiangYuan;

public 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 XiangYuan;

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());
}
}
package XiangYuan;

import java.util.Hashtable;

public class IgoChessmanFactory {
private static IgoChessmanFactory instance = new IgoChessmanFactory();
private static Hashtable hashtable;

private IgoChessmanFactory() {
hashtable = new Hashtable();
IgoChessman black, white;
black = new BlackIgoChessman();
hashtable.put("b", black);
white = new WhiteIgoChessman();
hashtable.put("w", white);
}

public static IgoChessmanFactory getInstance() {
return instance;
}

public static IgoChessman getIgoChessman(String color) {
return (IgoChessman) hashtable.get(color);
}
}
package XiangYuan;

class WhiteIgoChessman extends IgoChessman {
public String getColor() {
return "白色";
}
}
package XiangYuan;

public class Client {
public static void main(String[] args) {
IgoChessman black1, black2, black3, white1, white2;
black1 = IgoChessmanFactory.getIgoChessman("b");
black2 = IgoChessmanFactory.getIgoChessman("b");
black3 = IgoChessmanFactory.getIgoChessman("b");
System.out.println("判断两颗黑棋是否相同:" + (black1 == black2));
white1 = IgoChessmanFactory.getIgoChessman("w");
white2 = IgoChessmanFactory.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(2, 1));
white1.locate(new Coordinates(1, 3));
white2.locate(new Coordinates(3, 1));

}
}

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。