java设计模式之享元模式

定义一个公用的内部

public interface ClessFlyWeight {
void setColor(String c);
String getColor();
void display(Coordinate c);
}
class ConcreteChess implements ClessFlyWeight{

private String color;

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

@Override
public String getColor() {
// TODO Auto-generated method stub
return color;
}

@Override
public void setColor(String c) {
// TODO Auto-generated method stub
this.color=c;
}

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

}

定义享元工厂

/**
*
* 享元工厂类
* @author zzdxw
*
*/
public class ClessFlyWeightFactory {
//享元池
private static Map<String, ClessFlyWeight> map=new HashMap<String ,ClessFlyWeight>();
public static ClessFlyWeight getChess(String color){
if(map.get(color)!=null){
return map.get(color);
}else{
ClessFlyWeight cfw=new ConcreteChess(color);
map.put(color,cfw);
return cfw;
}
}
}

//定义一个外部的

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;
}

}

//客户端测试一下

public class Client {
public static void main(String[] args) {
ClessFlyWeight chess1=ClessFlyWeightFactory.getChess("黑色");
ClessFlyWeight chess2=ClessFlyWeightFactory.getChess("黑色");
System.out.println(chess1);
System.out.println(chess2);
}
}