1，模板类

package com.pattern.template;public abstract class CaffeineBeverageWithHook {		void prepareRecipe(){		boilWater();		brew();		pourInCup();		if(customerWantsCondiments()){			addCondiments();		}	}	abstract void brew();		abstract void addCondiments();		void boilWater(){		System.out.println("Boiling water");	}		void pourInCup(){		System.out.println("Pouring into cup");	}		boolean customerWantsCondiments(){		return true;	}}

2，模板的子类实现类

package com.pattern.template;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;public class CoffeeWithHook extends CaffeineBeverageWithHook{	/** 	 * @see com.pattern.template.CaffeineBeverageWithHook#brew()	 */	@Override	void brew() {		System.out.println("Dripping Coffee through filter");	}	/** 	 * @see com.pattern.template.CaffeineBeverageWithHook#addCondiments()	 */	@Override	void addCondiments() {		System.out.println("Adding Sugar and Milk");	}		public boolean customerWantsCondiments(){		String answer = getUserInput();				if(answer.toLowerCase().startsWith("y")){			return true;		} else{			return false;		}	}		private String getUserInput(){		String answer = null;		System.out.println("Would you like milk and sugar with your coffee (y/n)?");				BufferedReader in = new BufferedReader(new InputStreamReader(System.in));				try {			answer = in.readLine();		} catch (IOException e) {			System.out.println("IO Exception!");		}				if(answer == null){			return "no";		}		return answer;	}}

3，测试类

package com.pattern.template;public class BeverageTestDrive {		public static void main(String[] args) {		CoffeeWithHook coffeeHook = new CoffeeWithHook();		System.out.println("\nMaking tea...");		coffeeHook.prepareRecipe();	}}

4，输出结果：

Making tea...

Boiling water

Dripping Coffee through filter

Pouring into cup

Would you like milk and sugar with your coffee (y/n)?

y

Adding Sugar and Milk