Java享元模式(FlyWeight)

/**
 * 享元类
 * @author 波波烤鸭
 * @email dengpbs@163.com
 *
 */
public interface ChessFlyWeight {
	void setColor(String c);
	String getColor();
	void display(Coordinate c);
}

/**
 * 棋子 具体实现类
 * @author 波波烤鸭
 * @email dengpbs@163.com
 *
 */
class ConcreteChess implements ChessFlyWeight {

	private String color;
	
	public ConcreteChess(String color) {
		super();
		this.color = color;
	}

	@Override
	public void display(Coordinate c) {
		System.out.println("棋子颜色："+color);
		System.out.println("棋子位置："+c.getX()+"----"+c.getY());
	}

	@Override
	public String getColor() {
		return color;
	}

	@Override
	public void setColor(String c) {
		this.color = c;
	}
}

/**
 * 外部状态UnSharedConcreteFlyWeight
 * @author 波波烤鸭
 * @email dengpbs@163.com
 *
 */
public class Coordinate {
	private int x,y;

	public Coordinate(int x, int y) {
		super();
		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;
	}
}

/**
 *享元工厂类
 *    创建棋子
 * @author 波波烤鸭
 * @email dengpbs@163.com
 *
 */
public class ChessFlyWeightFactory {
	//享元池  根据颜色保存不同的棋子对象
	private static Map<String,ChessFlyWeight> map = new HashMap<String, ChessFlyWeight>();
	
	public static ChessFlyWeight  getChess(String color){
		// 如果已经存在该颜色的棋子返回
		if(map.get(color)!=null){
			return map.get(color);
		}else{
			// 如果享元池中没有该颜色的棋子就创建一个新的返回 并存储在享元池中
			ChessFlyWeight cfw = new ConcreteChess(color);
			map.put(color, cfw);
			return cfw;
		}
	}	
}

public class Client {
	public static void main(String[] args) {
		ChessFlyWeight chess1 = ChessFlyWeightFactory.getChess("黑色");
		ChessFlyWeight chess2 = ChessFlyWeightFactory.getChess("黑色");
		ChessFlyWeight chess3 = ChessFlyWeightFactory.getChess("白色");
		System.out.println(chess1);
		System.out.println(chess2);
		System.out.println(chess3);
		System.out.println("增加外部状态的处理===========");
		chess1.display(new Coordinate(10, 10));
		chess2.display(new Coordinate(20, 20));
	}
}

com.bjsxt.flyweight.ConcreteChess@15db9742
com.bjsxt.flyweight.ConcreteChess@15db9742
com.bjsxt.flyweight.ConcreteChess@6d06d69c
增加外部状态的处理===========
棋子颜色：黑色
棋子位置：10----10
棋子颜色：黑色
棋子位置：20----20