享元模式11（14）

Posted 2022-09-05 zzlcome

池技术：复用原对象

 

 

package structural;

import java.util.HashMap;

public class FlyweightPool 

    public static void main(String[] args) 

        int extrinsic = 22;
        Flyweight fx = FlyweightFactory.getFlyweight("X轴");
        fx.opration(extrinsic);
        Flyweight fy = FlyweightFactory.getFlyweight("Y轴");
        fy.opration(++extrinsic);
        Flyweight fz = FlyweightFactory.getFlyweight("Z轴");
        fz.opration(++extrinsic);
        Flyweight fx1 = FlyweightFactory.getFlyweight("X轴");
        fx1.opration(extrinsic);
        
        UnShareableFlyweight un = new UnShareableFlyweight("X轴");
        un.opration(++extrinsic);
        
        
        
    



abstract class Flyweight
    
    //内部状态
    public String instrinsic;
    //外部状态
    protected final String extrinsic;
    
    //享元角色必须接收外部状态
    public Flyweight(String extrinsic)
        this.extrinsic = extrinsic;
    
    
    public void opration(int extrinsic)

    public String getInstrinsic() 
        return instrinsic;
    

    public void setInstrinsic(String instrinsic) 
        this.instrinsic = instrinsic;
    
    


class ConcreteFlyweight extends Flyweight

    public ConcreteFlyweight(String extrinsic) 
        super(extrinsic);
    
    
    @Override
    public void opration(int extrinsic) 
        super.opration(extrinsic);
        System.out.println("具体flyweight："+extrinsic);
    


class UnShareableFlyweight extends Flyweight

    public UnShareableFlyweight(String extrinsic) 
        super(extrinsic);
    
    
    @Override
    public void opration(int extrinsic) 
        super.opration(extrinsic);
        System.out.println("不共享的flyweight："+extrinsic);
    


class FlyweightFactory
    private static HashMap<String,Flyweight> pool = new HashMap<String,Flyweight>();
    public static Flyweight getFlyweight(String extrinsic)
        Flyweight flyweight = null;
        if(pool.containsKey(extrinsic))
            flyweight = pool.get(extrinsic);
            System.out.print("已有 " + extrinsic + " 直接从池中取---->");
        else
            flyweight = new ConcreteFlyweight(extrinsic);
            pool.put(extrinsic, flyweight);
            System.out.print("创建 " + extrinsic + " 并从池中取出---->");
        
        return flyweight;