12.8
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。
类图：
源代码：
//Coordinates.java
package shiyan13;
//外部状态类——坐标类
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;
}
}
//Chess.java
package shiyan13;
abstract class Chess {
public abstract String getColor();
public void locate(Coordinates co) {
System.out.println(this.getColor()+"棋的位置："+co.getX()+","+co.getY());
}
}
//ChessFactory.java
package shiyan13;
import java.util.Hashtable;
public class ChessFactory {
private static ChessFactory instance=new ChessFactory();
private static Hashtable ht;
public ChessFactory() {
ht=new Hashtable();
Chess black,white;
black=new BlackChess();
ht.put("b", black);
white=new WhiteChess();
ht.put("w", white);
}
public static ChessFactory getInstance() {
return instance;
}
public static Chess getChess(String color) {
return (Chess)ht.get(color)
; }
}
//BlackChess.java
package shiyan13;
public class BlackChess extends Chess{
@Override
public String getColor() {
// TODO 自动生成的方法存根
return "黑";
}
}
//WhiteChess.java
package shiyan13;
public class WhiteChess extends Chess{
@Override
public String getColor() {
// TODO 自动生成的方法存根
return "白";
}
}
//Client.java
package shiyan13;
public class Client {
public static void main(String[] args) {
Chess black1,black2,black3,white1,white2;
ChessFactory factory;
factory = ChessFactory.getInstance();
black1 = ChessFactory.getChess("b");
black2 = ChessFactory.getChess("b");
black3 = ChessFactory.getChess("b");
white1 = ChessFactory.getChess("w");
white2 = ChessFactory.getChess("w");
black1.locate(new Coordinates(5, 5));
black2.locate(new Coordinates(-3, 4));
black3.locate(new Coordinates(3, 1));
white1.locate(new Coordinates(-1, 5));
white2.locate(new Coordinates(2, 4));
}
}
运行截图：
