设计模式之模版方法模式的钩子方法

Posted 2023-02-15

 

public  abstract class SoyaMilk 
    //模版方法 可以做成finaL，不让子类去覆盖
    final void make()
        select();
        if(customerWantCondiments())
            addCondiments();
        
        soak();
        beat();
    

    void select()
        System.out.println("第一步，请选择好的新鲜黄豆");
    

    //添加不同的配料，抽象方法，子类具体实现
    abstract  void addCondiments();



    //浸泡
    void soak()
        System.out.println("第三部，黄豆和配料开始浸泡，需要三个小时");
    

    void beat()
        System.out.println("第四步：黄豆和配料放到豆浆机去打碎");
    


    //钩子方法，决定是否需要添加配料
    boolean customerWantCondiments()
        return  true;
    

 

public class ReadBeanSoyaMilk extends SoyaMilk
    @Override
    void addCondiments() 
        System.out.println("加入上好的红豆");
    

 

public class PureSoyaMilk  extends SoyaMilk
    @Override
    void addCondiments() 
        System.out.println("2112");
    

    @Override
    boolean customerWantCondiments() 
        return false;
    

 

public class PeanutSoyaMilk extends SoyaMilk
    @Override
    void addCondiments() 
        System.out.println("加入上好的花生");
    

 

public class Cilent 
    public static void main(String[] args) 
        //制作红豆豆浆
        SoyaMilk readBeanSoyaMilk = new ReadBeanSoyaMilk();
        readBeanSoyaMilk.make();

        //制作花生豆浆
        SoyaMilk soyaMilk = new PeanutSoyaMilk();
        soyaMilk.make();

        //制作纯豆浆
        SoyaMilk ps =  new PureSoyaMilk();
        ps.make();