Introduction

An Example

//SoyaMilk.java
public abstract class SoyaMilk {
    //模板方法寫成final防止子類重寫
    protected final void make(){
        select();
        addCondiments();
        soak();
        beat();
    }

    protected void select(){
        System.out.println("Select");
    }

    protected abstract void addCondiments();


    protected void soak(){
        System.out.println("Step 3, soak them.");
    }

    protected void beat(){
        System.out.println("Work");
    }
}
 

//RedBeanMilk.java
public class RedBeanSoyaMilk extends SoyaMilk {
    @Override
    protected void addCondiments() {
        System.out.println("add black bean");
    }
}

//PeanutMilk.java
public class PeanutSoyaMilk extends SoyaMilk {
    @Override
    protected void addCondiments() {
        System.out.println("add peanut");
    }
}
 

//Client.java
public class Client {
    public static void main(String[] args) {
        System.out.println("Make Black Bean SoyaMilk");
        SoyaMilk blackBeanMilk = new RedBeanSoyaMilk();
        blackBeanMilk.make();
        System.out.println("Make Peanut SoyaMilk");
        SoyaMilk peanutMilk = new PeanutSoyaMilk();
        peanutMilk.make();
    }
}