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| public class MenuComponent { public void add(MenuComponent menuComponent) {throw new UnsupportedOperationException();} public void remove(MenuComponent menuComponent) {throw new UnsupportedOperationException();} public MenuComponent getChild(int i) {throw new UnsupportedOperationException();} public String getName() {throw new UnsupportedOperationException();} public String getDescription() {throw new UnsupportedOperationException();} public double getPrice() {throw new UnsupportedOperationException();} public boolean isVegetarian() {throw new UnsupportedOperationException();} public void print() {throw new UnsupportedOperationException();} }
public class MenuItem extends MenuComponent { String name; String description; boolean vegetarian; double price;
public MenuItem(String name, String description, boolean vegetarian, double price) { this.name = name; this.description = description; this.vegetarian = vegetarian; this.price = price; }
public String getName() { return name; }
public String getDescription() { return description; }
public double getPrice() { return price; }
public boolean isVegetarian() { return vegetarian; }
public void print() { System.out.print(" " + getName()); if (isVegetarian()) { System.out.print(" (v)"); } System.out.println(", " + getPrice()); System.out.println("-- " + getDescription()); } }
public class Menu extends MenuComponent { ArrayList menuComponents = new ArrayList(); String name; String description;
public Menu(String name, String description) { this.name = name; this.description = description; }
public void add(MenuComponent menuComponent) { menuComponents.add(menuComponent); }
public void remove(MenuComponent menuComponent) { menuComponents.remove(menuComponent); }
public MenuComponent getChild(int i) { return (MenuComponent) menuComponents.get(i); }
public String getName() { return name; }
public String getDescription() { return description; }
public void print() { System.out.print("\n" + getName()); System.out.println(", " + getDesc()); System.out.print("---------------------\n");
Iterator iterator = menuComponents.iterator(); while (iterator.hasNext()) { MenuComponent menuComponent = (MenuComponent) iterator.next(); menuComponent.print(); } } }
public class CompositeClient {
public static void main(String[] args) { MenuComponent pancakeHouseMenu = new Menu("PANCAKE HOUSE MENU", "Breakfast"); MenuComponent dinerMenu = new Menu("DINER MENU", "Lunch"); MenuComponent cafeMenu = new Menu("CAFE MENU", "Dinner"); MenuComponent dessertMenu = new Menu("DESSERT MENU", "Dessert of course !");
MenuComponent allMenus = new Menu("ALL MENUS", "All menus combined"); allMenus.add(pancakeHouseMenu); allMenus.add(dinerMenu); allMenus.add(cafeMenu);
pancakeHouseMenu.add(new MenuItem("K & B’s Pancake Breakfast", "Pancakes with scrambled eggs, and toast", true, 2.99)); pancakeHouseMenu.add(new MenuItem("Regular Pancake Breakfast", "Pancakes with fried eggs, sausage", false, 2.99)); pancakeHouseMenu.add(new MenuItem("Blueberry Pancakes", "Pancakes made with fresh blueberries", true, 3.49)); pancakeHouseMenu.add(new MenuItem("Waffles", "Waffles, with your choice of blueberries or strawberries", true, 3.59));
dinerMenu.add(new MenuItem("Pasta", "Spaghetti with Marinara Sauce, and a slice of sourdough bread", true, 3.89)); dinerMenu.add(new MenuItem("Vegetarian BLT", " (Fakin’)Bacon with lettuce & tomato on whole wheat", true, 2.99)); dinerMenu.add(new MenuItem("BLT", "Bacon with lettuce & tomato on whole wheat", false, 2.99)); dinerMenu.add(new MenuItem("Soup of the day", "Soup of the day, with a side of potato salad", false, 3.29));
dinerMenu.add(dessertMenu); dessertMenu.add(new MenuItem("Apple Pie", "Apple pie with a flakey crust, topped with vanilla icecream", true, 1.59));
cafeMenu.add(new MenuItem("Veggie Burger and Air Fries", "Veggie burger on a whole wheat bun, lettuce, tomato, and fries", true, 3.99)); cafeMenu.add(new MenuItem("Soup of the day", "A cup of the soup of the day, with a side salad", false, 3.69)); cafeMenu.add(new MenuItem("Burrito", "A large burrito, with whole pinto beans, salsa, guacamole", true, 4.29)); allMenus.print(); } }
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