Modifying variable value from method

Question

Hi, was wondering where im going wrong, any ideas?

Modifying variable value from method

Implement a method empty() in the TicketMachine class that simulates the effect of removing all money from the machine It should have a void return type and the body should simply set the total variable/field to zero.

Does this method need any parameters? No

Is this method a mutator or accessor? mutator

Paste the whole method into the space below

public void empty(int return) 
{ 
balance = 0; 
}

Mark: 0 out of 3

Comments:

* Test 1 (0.0 out of 3)



TicketMachine.java:26: <identifier> expected
  public void empty(int return)
                        ^
  TicketMachine.java:60: ')' expected
  }
  ^
  2 errors

The output should have been:

      No it doesn't need parameters 
       and it is a mutator
      TicketMachine emptied successfully

This is what was actually produced:

      Exception in thread "main" java.lang.NoClassDefFoundError: TicketMachine

Answer 1

You called your method parameter return:

public void empty(int return)

which is a reserved keyword in Java hence the error above. Rename the parameter...

Answer 2

I have no idea what you're actually asking. But one of the problems might be that return in Java is a reserved word. I can't imagine this ever compiled as you have it. Change it to something else (return0 maybe?) and see if that fixes your problem.

Answer 3

i try'd changing the "return" to balance, but that still gave me errors as well, can anyone help?

Answer 4

The question seems to indicate that there should be no parameters.

public void empty() {
balance = 0;
}

Answer 5

Additional info, here is the full program's code.

/**
 * TicketMachine models a naive ticket machine that issues
 * flat-fare tickets.
 * The price of a ticket is specified via the constructor.
 * It is a naive machine in the sense that it trusts its users
 * to insert enough money before trying to print a ticket.
 * It also assumes that users enter sensible amounts.
 *



    public class TicketMachine 
{
    // The price of a ticket from this machine.
    private int price;
    // The amount of money entered by a customer so far.
    private int balance;
    // The total amount of money collected by this machine.
    private int total;

//     private int name;



    /**
     * Create a machine that issues tickets of the given price.
     * Note that the price must be greater than zero, and there
     * are no checks to ensure this.
     */
    public TicketMachine()
    {
        price = 1000;
        balance = 0;
        total = 0;
//         name = "";
    }


public void empty()
{
balance = 0;
}
//     public void setPrice (int ticketCost)
//     {
//         price = ticketCost;
//     }
    public void setPrice(int newPrice)
    {
        price = newPrice;
    }
    public void setName(int Name, int newName)
{
        Name = newName;
}
//     public TicketMachine(int price)
//     {

//      System.out.println("Price cannot be negative: Setting it to 10");
//     }



    public void priceCompare(int Budget)
    {
     Budget = price;

     if (Budget < price) 
     System.out.println("Too expensive");
     else 
     System.out.println("Just right");
     if
     (Budget > price) 


     System.out.println("Too expensive");
     else 
     System.out.println("Just right");
    }

    /**
     * Return the price of a ticket.
     */
    public int getPrice()
    {
        return price;
    }

    /**
     * Return the amount of money already inserted for the
     * next ticket.
     */
    public int getBalance()
    {
        return balance;
    }

    /**
     * Receive an amount of money in cents from a customer.
     */
    public void insertMoney(int amount)
    {
        balance = balance + amount;
    }

//     public void setName(int newName)
//     {
//         name = newName;
//     }

    /**
     * Print a ticket.
     * Update the total collected and
     * reduce the balance to zero.
     */
      public void prompt()
      {
        System.out.println("please insert correct amount of money");
      }

      public void showPrice()
      {
        System.out.println("the price of a ticket is 5 cents");
      }



      public int getAge(int age) 
      {
   return age;
      }


       public byte getName(byte name)
      {

   return name;
      }




   public void printTicket()
    {
        // Simulate the printing of a ticket.
        System.out.println("##################");
        System.out.println("# The BlueJ Line");
        System.out.println("# Ticket");
        System.out.println("# "  + price + " cents.");
        System.out.println("##################");
        System.out.println();

        // Update the total collected with the balance.
        total = total + balance;
        // Clear the balance.
        balance = 0;
    }
}