设计模式之享元模式 FlyWeight

 代码实现

/**
 * 享元工厂类
 * @author bzhx
 * 2017年3月14日
 */
public class ChessFlyWeightFactory {
    //享元池
    private static Map<String,ChessFlyWeight> map = new HashMap<String,ChessFlyWeight>();
    public static ChessFlyWeight getChess(String color){
        if(map.get(color)!=null){
            return map.get(color);
        }else{
            ChessFlyWeight cfw = new ConcreteChess(color);
            map.put(color, cfw);
            return cfw;
        }
    }
}

public interface ChessFlyWeight {

    void setColor(String c);
    String getColor();
    void display(Coordinate c);
}

//内部状态ConcreteFlyWeight
class ConcreteChess implements ChessFlyWeight{

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

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

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

/**
 * 外部状态 UnSharedConcreteFlyWeight
 * @author bzhx
 * 2017年3月14日
 */
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;
    }
    
    
    
}

public class Client {

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

}