设计模式07享元模式与组合模式详解

package com.wf.flyweight.general;
/**
* @ClassName IFlyweight
* @Description 享元角色，顶层接口
* @Author wf
* @Date 2020/5/25 10:07
* @Version 1.0
*/
public interface IFlyweight {
void operation(String extrinsicState);
}

package com.wf.flyweight.general;
/**
* @ClassName ConcreteFlyweight
* @Description 享元实现,因为该类实例需要反复使用，所以，使用工厂类来创建实例
* @Author wf
* @Date 2020/5/25 10:10
* @Version 1.0
*/
public class ConcreteFlyweight implements IFlyweight {
private String intrinsicState;
public ConcreteFlyweight(String intrinsicState) {
this.intrinsicState = intrinsicState;
}
@Override
public void operation(String extrinsicState) {
System.out.println("Object address:"+System.identityHashCode(this));
System.out.println("IntrinsicState:"+this.intrinsicState);
System.out.println("ExtrinsicState:"+extrinsicState);
}
}

package com.wf.flyweight.general;
import java.util.HashMap;
import java.util.Map;
/**
* @ClassName FlyweightFactory
* @Description 享元工厂，因为需要把实例添加到缓存，会创建容器
* @Author wf
* @Date 2020/5/25 10:16
* @Version 1.0
*/
public class FlyweightFactory {
private static Map pool = new HashMap();
//因为内部状态具备不变性，因此，作为缓存key
public static IFlyweight getFlyweight(String intrinsicState){
if(!pool.containsKey(intrinsicState)){
IFlyweight flyweight = new ConcreteFlyweight(intrinsicState);
pool.put(intrinsicState, flyweight);
}
return pool.get(intrinsicState);
}
}