今日总结
享元模式
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
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;
}
}
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());
}
}
class BlackIgoChessman extends IgoChessman{
@Override
public String getColor() {
// TODO Auto-generated method stub
return "黑色";
}
}
class WhiteIgoChessman extends IgoChessman{
@Override
public String getColor() {
// TODO Auto-generated method stub
return "白色";
}
}
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);
}
}
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));
}
}
