设计模式之模版方法模式的钩子方法

 

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();
    }
}