8. 템플릿 메소드 패턴

Coffee.java

public class Coffee {
	void prepareReceipe() {
		boilWater();
		brewCoffeeGrinds();
		pourInCup();
		addSugarAndMilk();
	}

	private void addSugarAndMilk() {
		System.out.println("설탕과 우유를 추가하는 중");
	}

	private void pourInCup() {
		System.out.println("컵에 따르는 중");
	}

	private void brewCoffeeGrinds() {
		System.out.println("필터를 통해서 커피를 우려내는 중");
	}

	private void boilWater() {
		System.out.println("물 끓이는 중");
	}
}

Tea.java

public class Tea {
	void prepareReceipe() {
		boilWater();
		steepTeaBag();
		pourInCup();
		addLemon();
	}

	private void addLemon() {
		System.out.println("레몬를 추가하는 중");
	}

	private void pourInCup() {
		System.out.println("컵에 따르는 중");
	}

	private void steepTeaBag() {
		System.out.println("차를 우려내는 중");
	}

	private void boilWater() {
		System.out.println("물 끓이는 중");
	}
}

BeverageTest.java

import org.junit.Test;

public class BeverageTest {
	
	@Test
	public void 커피_차() {
		Tea tea = new Tea();
		Coffee coffee = new Coffee();
		
		System.out.println("\nMaking tea...");
		tea.prepareReceipe();
		
		System.out.println("\nMaking coffee...");
		coffee.prepareReceipe();
	}
}

CaffeinBeverage.java

public abstract class CaffeinBeverage {
	final void prepareReceipe() {
		boilWater();
		brew();
		pourInCup();
		addCondiments();
	}

	abstract void addCondiments();
	abstract void brew();

	private void pourInCup() {
		System.out.println("컵에 따르는 중");
	}

	private void boilWater() {
		System.out.println("물 끓이는 중");
	}

}

Coffee.java

public class Coffee extends CaffeinBeverage {
	@Override
	void addCondiments() {
		System.out.println("설탕과 우유를 추가하는 중");
	}

	@Override
	void brew() {
		System.out.println("필터를 통해서 커피를 우려내는 중");
	}
}

Tea.java

public class Tea extends CaffeinBeverage {
	@Override
	void addCondiments() {
		System.out.println("레몬를 추가하는 중");
	}

	@Override
	void brew() {
		System.out.println("차를 우려내는 중");
	}
}

CoffeeWithHook.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class CoffeeWithHook extends CaffeinBeverageWithHook {

	@Override
	void addCondiments() {
		System.out.println("우유와 설탕을 추가하는 중");
	}

	@Override
	void brew() {
		System.out.println("필터로 커피를 우려내는 중");
	}

	/*
	 * 후크 메소드: 서브클래스에서 재정의
	 */
	public boolean customerWantsCondiments() {
		String answer = getUserInput();
		
		if (answer.toLowerCase().startsWith("y"))
			return true;
		else
			return false;
	}

	private String getUserInput() {
		String answer = null;
		
		System.out.print("커피에 우유와 설탕을 넣어 드릴까요? (y/n) ");
		
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		try {
			answer = in.readLine();
		} catch(IOException ioe) {
			System.err.println("IO 오류");
		}
		
		if (answer == null) {
			return "no";
		}
		return answer;
	}
}

TeaWithHook.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class TeaWithHook extends CaffeinBeverageWithHook {

	@Override
	public void addCondiments() {
		System.out.println("레몬을 추가하는 중");
	}

	@Override
	public void brew() {
		System.out.println("차를 우려내는 중");
	}

	public boolean customerWantsCondiments() {
		String answer = getUserInfo();
		
		if (answer.toLowerCase().startsWith("y"))
			return true;
		else
			return false;
	}

	private String getUserInfo() {
		String answer = null;
		
		System.out.print("차에 레몬을 넣어 드릴까요? (y/n) ");
		
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		try {
			answer = in.readLine();
		} catch(IOException ioe) {
			System.err.println("IO 오류");
		}
		
		if (answer == null) {
			return "no";
		}
		return answer;
	}
}

BeverageTestDrive.java

public class BeverageTestDrive {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		TeaWithHook teaHook = new TeaWithHook();
		CoffeeWithHook coffeeHook = new CoffeeWithHook();
		
		System.out.println("\n차 준비중...");
		teaHook.prepareReceipe();
		
		System.out.println("\n커피 준비중...");
		coffeeHook.prepareReceipe();
	}

}

Duck.java

public class Duck implements Comparable {
	String name;
	int weight;
	
	public Duck(String name, int weight) {
		this.name = name;
		this.weight = weight;
	}
	
	public String toString() {
		return name + " weight " + weight;
	}
	
	public int compareTo(Object object) {
		Duck otherDuck = (Duck) object;
		
		if (this.weight < otherDuck.weight)
			return -1;
		else if (this.weight == otherDuck.weight)
			return 0;
		else	//this.weight > otherDuck.weight
			return 1;
	}

}

DuckSortTest.java

import java.util.Arrays;

import org.junit.Test;


public class DuckSortTest {
	@Test
	public void sort테스트() {
		Duck[] ducks = {
				new Duck("Daffy", 8),
				new Duck("Dewey", 2),
				new Duck("Howard", 7),
				new Duck("Louie", 2),
				new Duck("Donald", 10),
				new Duck("Huey", 2)
		};
		
		System.out.println("Before sorting: ");
		display(ducks);
		
		Arrays.sort(ducks);
		
		System.out.println("\nAfter sortingL ");
		display(ducks);
		
	}

	private void display(Duck[] ducks) {
		for (int i = 0; i < ducks.length; i++) {
			System.out.println(ducks[i]);
		}
	}
}