设计模式之享元模式

其实本猿觉得吧，很多模式都是没啥可学的，大概就是你代码写多了，你自然而然的就会知道如何有效的编码了。

说下享元模式吧，反正闲着也是闲着：

public interface Jianzhu { 
  void use(); 
}


public class TiYuGuan implements Jianzhu {
	private String name;
	private String shape;
	private String yundong;
	public TiYuGuan(String yundong){
		this.setYundong(yundong);
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getShape() {
		return shape;
	}
	public void setShape(String shape) {
		this.shape = shape;
	}
	public String getYundong() {
		return yundong;
	}
	public void setYundong(String yundong) {
		this.yundong = yundong;
	}
	@Override
	public void use() {
		System.out.println("该体育馆被使用来召开奥运会" + "  运动为："+ yundong+"  形状为："+shape+ "  名称为："+name);
	}
}


import java.util.*;

public class JianZhuFactory {
	private static final Map<String,TiYuGuan> tygs = new HashMap<String,TiYuGuan>();
	public static TiYuGuan getTyg(String yundong){
		TiYuGuan tyg = tygs.get(yundong);  //从map中获取TiYuGuan对象
		if(tyg == null){   //判断为空则创建新的TiYuGuan
			tyg = new TiYuGuan(yundong);
			tygs.put(yundong,tyg);
		}
		return tyg;
	}
	public static int getSize(){
		return tygs.size();   //由于会判断为空才创建，所以这里会保证相同对象只有一个，这个就是有点类似单例模式
	}
}

//测试
public class Clienter {
	public static void main(String[] args) {
		TiYuGuan yundong ="足球";
		for(int i = 1;i <= 5;i++){
			Object tyg = JianZhuFactory.getTyg(yundong);
			System.out.println("对象池中对象数量为："+JianZhuFactory.getSize());
		}
	}
}

享元模式就是有点类似单例模式，没啥可说的，拜拜。