candymachine.java

java编的售糖程序

// Program candy machine

import java.io.*;

public class CandyMachine
{
    static BufferedReader keyboard =
                new BufferedReader(new InputStreamReader(System.in));

    public static void main(String[] args) throws IOException
    {
         CashRegister  cashRegister = new CashRegister();   //Step 1
         Dispenser candy = new Dispenser(100,50);           //Step 2
         Dispenser chips = new Dispenser(100,65);           //Step 2
         Dispenser gum = new Dispenser(75,45);              //Step 2
         Dispenser cookies = new Dispenser(100,85);         //Step 2

         int choice; //variable to hold the selection       //Step 3

         showSelection();                                   //Step 4
         choice = Integer.parseInt(keyboard.readLine());    //Step 5

         while(choice != 9)                                 //Step 6
         {
            switch(choice)                                  //Step 6a
          {
          case 1: sellProduct(candy, cashRegister);
                  break;
          case 2: sellProduct(chips, cashRegister);
                  break;
          case 3: sellProduct(gum, cashRegister);
                  break;
          case 4: sellProduct(cookies, cashRegister);
                  break;
          default: System.out.println("Invalid Selection");
          }//end switch

            showSelection();                                //Step 6b
            choice = Integer.parseInt(keyboard.readLine()); //Step 6c
        }//end while
    }//end main


    public static void showSelection()
    {
        System.out.println("*** Welcome to Shelly's Candy Shop ***");
        System.out.println("To select an item, enter ");
        System.out.println("1 for Candy");
        System.out.println("2 for Chips");
        System.out.println("3 for Gum");
        System.out.println("4 for Cookies");
        System.out.println("9 to exit");
    }//end showSelection


    public static void sellProduct(Dispenser product,
                                   CashRegister cRegister)
                                             throws IOException
    {
         int amount;  //variable to hold the amount entered
         int amount2; //variable to hold the extra amount needed

         if(product.getCount() > 0)  //if dispenser is not empty
         {
            System.out.println("Please deposit "
                                + product.getProductCost()
                                + " cents");
            amount = Integer.parseInt(keyboard.readLine());

            if(amount < product.getProductCost())
            {
               System.out.println("Please deposit another "
                           + (product.getProductCost() - amount)
                           + " cents");
               amount2 = Integer.parseInt(keyboard.readLine());
               amount = amount + amount2;
            }

            if(amount >= product.getProductCost())
            {
               cRegister.acceptAmount(amount);
               product.makeSale();
               System.out.println("Collect your item at the "
                                + "bottom and enjoy.");
            }
            else
               System.out.println("The amount is not enough. "
                                + "Collect what you deposited.");
            System.out.println("*-*-*-*-*-*-*-*-*-*-"
                             + "*-*-*-*-*-*-*-*-*-*");
         }
         else
            System.out.println("Sorry this item is sold out.");
    }//end sellProduct


}