Simple java program help.

Hi I have this neighborhood class and I am suppose to right a lemonadestand class for it that keep tracks of the amount of sales at the stand.

This is the neighborhood class

Code:

---

public class Neighborhood
{
  public static void main(String [] args)
  {
    LemonadeStand stand1 = new LemonadeStand();
        stand1.sell(3);
        stand1.sell(2);
        stand1.sell(1);
        System.out.println(stand1.toString());
       
        LemonadeStand stand2 = new LemonadeStand(10);
        stand2.sell(5);
        System.out.println(stand2);
  }
}

---

this is my code right underneath it.

Code:

---

public class LemonadeStand();
{
  private double lemonSales;
  public class sell(double sales)
  {
    lemonSales = sales;
       
  }
}

---

my compiler errors are:

Code:

---

Neighborhood.java:17: '{' expected
public class LemonadeStand();
                          ^
Neighborhood.java:20: '{' expected
  public class sell(double sales)
                  ^
Neighborhood.java:20: ';' expected
  public class sell(double sales)
                                ^
Neighborhood.java:25: reached end of file while parsing
}

---

You seem to be confusing classes with methods.

Code:

---

public class LemonadeStand();

---

Lose the brackets and the semicolon.

Code:

---

  public class sell(double sales)
  {
    lemonSales = sales;
       
  }

---

Pretty sure you mean "void" instead of "class".

You'll need to override toString() for your program to produce anything meaningful though.

Code:

---

public class sell(double sales) {
    lemonSales = sales;
}

---

Another problem: your LemonadeStand class will only hold the last value passed to the sell method. So in your example it will hold 1 and the previous calls of 3 and 2 will be lost. Shouldn't it be keeping a total of all sales made?

Okay I have changed up the code so far to this but it is still giving me errors.

New code

Code:

---

class LemonadeStand
{
  private double lemonSales;
  public void sell(double sales)
  {
   
    lemonSales = sales;
       
  }
  @Override       
        public        String        toString()
        {
                return String.format( "Stan sold "+sales.sell()+" cups" );
        }

}

---

my errors.

Code:

---

Neighborhood.java:11: cannot find symbol
symbol  : constructor LemonadeStand(int)
location: class LemonadeStand
        LemonadeStand stand2 = new LemonadeStand(10);
                                ^
Neighborhood.java:29: cannot find symbol
symbol  : variable sales
location: class LemonadeStand
                return String.format( "Stan sold "+sales.sell()+" cups" );
                                                  ^
2 errors

---

The compiler is telling you that it can't find a constructor for LemonadeStand that takes an int argument. So I guess you should write one.

It's also telling you that it can't find a variable called 'sales' in the toString() method (this will be because it's not a class variable or declared in the toString() method).

Writing constructors is pretty basic stuff - we can't really teach Java here, we're basically here to help people who get stuck. We can help, but you really ought to know about constructors already.

Quote:

---

Originally Posted by CGHMN

Okay I have changed up the code

---

So you decided to introduce more errors into your code before fixing all the other errors already pointed out to you.

Considering that I did this :

Code:

---

public class LemonadeStand(int lemonSales)
{
  private int lemonSales;

}

  public void sell(int sales)
  {
   
    lemonSales = sales;
       
  }
 
  @Override       
        public        String        toString()
        {
                return String.format( "Stan sold "+sales.sell()+" cups" );
        }

---

now I get

Code:

---

Neighborhood.java:17: '{' expected
public class LemonadeStand(int lemonSales);
                          ^
Neighborhood.java:17: ';' expected
public class LemonadeStand(int lemonSales);
                                        ^
Neighborhood.java:19: illegal start of expression
  private int lemonSales;
  ^
Neighborhood.java:34: reached end of file while parsing
        }
        ^
4 errors

---

Compare the LemonStand class to the Neighborhood class. Do they look the same. What is different about them. Stop guessing and making random changes to your code. You need to fully understand what you are doing. If you don't then go back and review the basics. Stop writing code until you do understand.

I have taken that into consideration and I am splitting the files.

While I am a big advocate for having each class in its own file, splitting them has nothing to do with your problems.

As junky said, splitting the files is fine, but not entirely necessary. If the files are split, You should have each class containing a similar structure. Containing state(variables) and behavior(methods), also the compiler messages will make sense to you if you make efforts to understand and properly modify the code. Don't hesitate to read your textbook or tutorials if you need clarification.

I've been going through the book and the packets of information. Also I'm going through my old code and this should work. I think it has a problem interpreting the variables. It seems I have to run a tokenizer up the String balancer

What on earth are you talking about?

Code:

---

public class LemonadeStand(int lemonSales)
{

---

That is not valid syntax and has nothing to do with a StringTokenizer. Where did you get that from?

Ya, you are confusing some things.

The entire class should have the following: one instance variable, two methods, and two constructors. Look those up on google by typing "java tutorial <keyword>"

I have made some progress and now the LemonadeStand.java will compile but for some reason the set method from the Neighborhood class cannot find the LemonadeStand method that is clearly defined in the other class. Unless my constructor is completely off. well here is my code which is now it's own separate file.

Code:

---

public class LemonadeStand extends Neighborhood
{
  private double lemonSales;
 
  public LemonadeStand(double sales)
  {
        lemonSales = sales;
  }
  public void sell(double sales)
  {
   
    lemonSales = sales;
       
  }
  /*public void getSales(int sales);
  {
    lemonSales = sales;
    return sales;
  }*/
 
  @Override       
        public        String        toString()
        {
                return String.format( "Stan sold "+" cups" );
        }
}

---

Heres the error

Code:

---

Neighborhood.java:5: cannot find symbol
symbol  : constructor LemonadeStand()
location: class LemonadeStand
    LemonadeStand stand1 = new LemonadeStand();
                          ^
1 error

---

I'm trying to just get the skeleton up and running so then I go through and so the simple task it want's from me. I don't understand why it cannot call to the LemonadeStand method.

You should not be using inheritance. If you do use inheritance you should think to yourself, "is a lemonade stand a neighborhood?", if it isn't you should never use inheritance. I think it's a safe statement to say that you are still in the beginning stages and should not be using inheritance for a while.

Next, you should not have a setter method, the only methods you should have is toString() and sell(int x).

Then you need to look up constructors and overloading them.

Well inheritance doesn't sound too off. I think I am really far behind in this class which is sad because it's intro to java 2. Maybe I need to figure out why my constructor isn't doing it's job perhaps the parameters are wrong.

Quote:

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Originally Posted by CGHMN

Well inheritance doesn't sound too off.

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Yeah, it does. Really.

You know what taking that into consideration I have eliminated all traces of inheritance. :(handshake):