import java.util.*; /** * * Description How I eat cereal. * * @version 1.0 vom 04.01.2018 * @author Stefan Böckmann */ public class HowIEatCereal { public static void main(String[] args) { String[] intro = { "I'm hungry. I want cereal!", "Hmm I need four things.", "1. Milk,", "2. a Bowl,", "3. a Spoon,", "4. and of course cereal.", "The milk is in the fridge.", "The bowl and the cereal are in the closet under the fridge.", "And at last the Spoon is in the Drawer left next to the fridge."}; for (String s : intro ) { System.out.println(s); } // Items I need Item milk = null; Item bowl = null; Item cereal = null; Item spoon = null; // The items are in these containers Fridge fridge = new Fridge(); Closet closet = new Closet(); Drawer drawer = new Drawer(); // Take the milk out of the fridge fridge.open(); try { milk = fridge.takeItem("Milk"); } catch(NoAccessToItemException e) { } fridge.close(); // Take the bowl and the cereal out of the closet closet.open(); try { bowl = closet.takeItem("Bowl"); cereal = closet.takeItem("Cereal"); } catch(NoAccessToItemException e) { } closet.close(); // Take the spoon out of the drawer drawer.open(); try { spoon = drawer.takeItem("Spoon"); } catch(NoAccessToItemException e){ } drawer.close(); // Take a closer look to the items if(milk != null) milk.printStatus(); if(bowl != null) bowl.printStatus(); if(cereal != null) cereal.printStatus(); if(spoon != null) spoon.printStatus(); // Now let us use the items if(milk != null) milk.use(); if(bowl != null) bowl.use(); if(cereal != null) cereal.use(); if(spoon != null) spoon.use(); System.out.println("Finally the time has come to eat cereal. Yummy :P"); } } abstract class Item { public String getName(){ return this.getClass().getName(); } public abstract void printStatus(); public abstract void use(); public static Item getItemFromListByName (List items, String name) throws ItemNotFoundException { Item item = null; for (Item i : items) { if (i.getName() == name) { item = i; break; } } if (item == null) { throw new ItemNotFoundException(); } else { return item; } } public static int getCountOfItemInList (List items, Item item) { int count = 0; for (Item i : items) { if (i.getName() == item.getName()) { count++; } } return count; } public static List getListOfDifferentItemsInList (List items) { List differentItems = new ArrayList(); for (Item i : items) { if (!differentItems.contains(i)) { differentItems.add(i); } } return differentItems; } } /* * Exceptions */ class ItemNotFoundException extends Exception { public ItemNotFoundException() { super("The item is not there!"); } } class NoAccessToItemException extends Exception { public NoAccessToItemException() { super("No access to the item at the moment!"); } } /* * Items */ class Cereal extends Item { private final int GRAM_WHOLE_PACKAGE = 240; private final int GRAM_PER_PORTION = 30; private final int EMPTY = 0; private int currentGram = 240; @Override public void printStatus(){ System.out.print("Cereal pack: "); if (currentGram == GRAM_WHOLE_PACKAGE) { System.out.println("A new and filled pack."); } else if(currentGram > GRAM_PER_PORTION && currentGram < GRAM_WHOLE_PACKAGE) { System.out.println("Don't worry there is enough for more than one portion."); } else if(currentGram == GRAM_WHOLE_PACKAGE) { System.out.println("You're lucky, only one portion left."); } else if(currentGram < GRAM_PER_PORTION && currentGram > EMPTY) { System.out.println("There are not enough in it for a whole portion. But maybe for a small portion."); } else if (currentGram == EMPTY) { System.out.println("Oh no, the pack is empty. You need a new pack."); } } @Override public void use(){ if (currentGram >= GRAM_PER_PORTION) { currentGram -= GRAM_PER_PORTION; } else { currentGram = EMPTY; // Use the rest } } } class Milk extends Item { private final int MILLILITRE_WHOLE_PACKAGE = 1000; private final int MILLILITRE_PER_PORTION = 300; private final int EMPTY = 0; private int currentMillilitre = 100; @Override public void printStatus(){ System.out.print("Milk pack: "); if (currentMillilitre == MILLILITRE_WHOLE_PACKAGE) { System.out.println("A new and filled pack."); } else if(currentMillilitre > MILLILITRE_PER_PORTION && currentMillilitre < MILLILITRE_WHOLE_PACKAGE) { System.out.println("Don't worry there is enough for more than one portion."); } else if(currentMillilitre == MILLILITRE_WHOLE_PACKAGE) { System.out.println("You're lucky, only one portion left."); } else if(currentMillilitre < MILLILITRE_PER_PORTION && currentMillilitre > EMPTY) { System.out.println("There are not enough in it for a whole portion. But maybe for a small portion."); } else if (currentMillilitre == EMPTY){ System.out.println("Oh no, the pack is empty. You need a new pack."); } } @Override public void use(){ if (currentMillilitre >= MILLILITRE_PER_PORTION) { currentMillilitre -= MILLILITRE_PER_PORTION; } else { currentMillilitre = EMPTY; // Use the rest } } } class Spoon extends Item { private boolean clean = true; @Override public void printStatus(){ if (clean) { System.out.println("The spoon is clean you can use it."); } else { System.out.println("The spoon isn't clean you should take a new one."); } } @Override public void use(){ clean = false; } } class Bowl extends Item { private boolean clean = true; @Override public void printStatus(){ if (clean) { System.out.println("The bowl is clean you can use it."); } else { System.out.println("The bowl isn't clean you should take a new one."); } } @Override public void use(){ clean = false; } } interface ItemContainer { public void open(); public void close(); public void showContent(); public Item takeItem(String itemName) throws NoAccessToItemException; } /* * ItemContainers */ class Closet implements ItemContainer { private List items = new ArrayList(); private boolean open = false; public Closet(){ items.add(new Bowl()); items.add(new Cereal()); } @Override public void showContent(){ if (open) { List differentItems = Item.getListOfDifferentItemsInList(items); for (Item i : differentItems) { System.out.println(Item.getCountOfItemInList(items, i)+" x\t"+i.getName()); } } else { System.out.println("You need to open the closet to see the content."); } } @Override public void open(){ open = true; System.out.println("The closet is now open."); } @Override public void close(){ open = false; System.out.println("The closet is now closed."); } @Override public Item takeItem(String itemName) throws NoAccessToItemException { Item takenItem = null; if (open) { try { takenItem = Item.getItemFromListByName(items, itemName); items.remove(takenItem); System.out.println("You take the "+takenItem.getName()+"."); return takenItem; } catch(ItemNotFoundException e) { throw new NoAccessToItemException(); } } else { throw new NoAccessToItemException(); } } } class Drawer implements ItemContainer { private List items = new ArrayList(); private boolean open = false; public Drawer(){ items.add(new Spoon()); } @Override public void showContent(){ if (open) { List differentItems = Item.getListOfDifferentItemsInList(items); for (Item i : differentItems) { System.out.println(Item.getCountOfItemInList(items, i)+" x\t"+i.getName()); } } else { System.out.println("You need to open the drawer to see the content."); } } @Override public void open(){ open = true; System.out.println("The drawer is now open."); } @Override public void close(){ open = false; System.out.println("The drawer is now closed."); } @Override public Item takeItem(String itemName) throws NoAccessToItemException { Item takenItem = null; if (open) { try { takenItem = Item.getItemFromListByName(items, itemName); items.remove(takenItem); System.out.println("You take the "+takenItem.getName()+"."); return takenItem; } catch(ItemNotFoundException e) { throw new NoAccessToItemException(); } } else { throw new NoAccessToItemException(); } } } class Fridge implements ItemContainer { private List items = new ArrayList(); private boolean open = false; public Fridge(){ items.add(new Milk()); } @Override public void showContent(){ if (open) { List differentItems = Item.getListOfDifferentItemsInList(items); for (Item i : differentItems) { System.out.println(Item.getCountOfItemInList(items, i)+" x\t"+i.getName()); } } else { System.out.println("You need to open the fridge to see the content."); } } @Override public void open(){ open = true; System.out.println("The fridge is now open."); } @Override public void close(){ open = false; System.out.println("The fridge is now closed."); } @Override public Item takeItem(String itemName) throws NoAccessToItemException{ Item takenItem = null; if (open) { try { takenItem = Item.getItemFromListByName(items, itemName); items.remove(takenItem); System.out.println("You take the "+takenItem.getName()+"."); return takenItem; } catch(ItemNotFoundException e) { throw new NoAccessToItemException(); } } else { throw new NoAccessToItemException(); } } }