添加了咖啡种类选择逻辑和投币管理以及杯子类型的选择模块

src/model/Box.java

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+package model;
+
+public class Box {
+	private Water water;
+	private Sugar sugar;
+	private Cup cup;
+	private Milktea milktea;
+	private Coffee coffee; 
+
+	public Box(){
+		water = new Water();
+		sugar = new Sugar();
+		cup = new Cup();
+		milktea = new Milktea();
+        coffee = new Coffee();
+	}
+
+	public Water getWater() {
+		return water;
+	}
+
+	public Sugar getSugar() {
+		return sugar;
+	}
+
+	public Cup getCup() {
+		return cup;
+	}
+
+	public Milktea getMilktea() {
+		return milktea;
+	}
+
+	public Coffee getCoffee() {
+		return coffee;
+	}
+	public boolean isNotEmpty(){
+		return !water.isEmpty()&&
+			    !coffee.isEmpty()&&
+				!milktea.isEmpty()&&
+				!sugar.isEmpty()&&
+				!cup.isEmpty();
+	}
+
+}

src/model/Coffee.java

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+package model;
+
+public class Coffee extends Material {
+
+	private final int MAX_NUM = 100;
+	protected final int ONE_CUP = 10;
+	protected final int HALF_CUP = 5;
+
+	public void fill() {		
+		this.setQuantity(MAX_NUM);
+	}
+
+	public void useOneCup(){
+		this.setQuantity(this.quantity-=ONE_CUP);
+	}
+	public void useHalfCup(){
+		this.setQuantity(this.quantity-=HALF_CUP);
+	}
+
+}

src/model/CoffeeKind.java

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+package model;
+
+public enum CoffeeKind {
+	ESSPRESO,LIGHT,MILKTEA;
+}

src/model/Coin.java

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+package model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Coin {
+	private int num = 0;
+	private List<CoinObserver> list;
+
+	public Coin(){
+		list = new ArrayList<CoinObserver>();
+	}	
+	public void addObserver(CoinObserver co){
+		list.add(co);
+	}	
+	public void removeObserver(CoinObserver co){
+		list.remove(co);
+	}	
+	public void updateAll(){
+		for(CoinObserver co:list){
+			co.update(num);
+		}
+	}
+	public void putCoin(){
+		num++;
+		updateAll();
+	}
+
+	public void getCoin(){
+		if(num>0){
+			num--;			
+			updateAll();
+		}
+	}
+
+	public int getNum() {
+		return num;
+	}
+
+	public boolean isEmpty(){
+		return num==0;
+	}
+
+}

src/model/CoinNumberLabel.java

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+package model;
+
+import javax.swing.JLabel;
+
+public class CoinNumberLabel extends JLabel implements CoinObserver {
+
+	private static CoinNumberLabel anInstance;
+
+	public static CoinNumberLabel getAnInstance(){
+		if(anInstance == null){
+			anInstance = new CoinNumberLabel();
+		}
+		return anInstance;
+	}	
+
+	private CoinNumberLabel(){
+		this.setText("0");
+	}
+
+	public void update(int num) {
+		this.setText(""+num);
+	}
+
+}

src/model/CoinObserver.java

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+package model;
+
+public interface CoinObserver {
+	public void update(int num);
+}

src/model/Cup.java

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+package model;
+
+public class Cup extends Material {
+
+	private final int MAX_NUM = 10;
+	private final int ONE_CUP = 1;
+
+	public void fill() {		
+		this.setQuantity(MAX_NUM);
+	}
+
+	public void useOneCup() {	
+		this.setQuantity(quantity-=ONE_CUP);
+	}
+
+}