Java package - money

Question

good evening guys,
i am finding a piece of work extremely tough going at the moment and wondered if i could get any hints/help on where im going wrong. i am aiming to produce a package (money.java) which could be used in order to produce arithmetic calculations on sums of money.
The code i have at the moment is:
MONEY.JAVA:
package java;
public class money
     private int data1, data2;
     public money()
         data1=0;
         data2=0;
     public money(int value1, int value 2)
          data1 = value1;
          data2 = value2;
    public void addMoney(int value1, int value2)
          return value1 + value2;
     public void subtractMoney(int value1, int value2)
          return value1 - value2;
     public void divideMoney(int value1, int value2)
          return value1 / value2;
     public void multiplyMoney(int value1, int value2)
          return value1 * value2;
}MONEYTEST.JAVA
import java.money;
public class MoneyTest
    public static void main(String [] args)
         money p = new money(10,20);
         System.out.println("The total is " + p.addMoney());
}I think i may need a 'toString' method? and also, is there any way of covering errors? im sorry if these problems are trivial. I have various books, but can't seem to use them in this case.
Thank you for any feedback.
Jess

Answer 1

That's a class, not a pakcage.
Do you need a toString? There's already a toString defined on Object that you inherit. It's not very useful though. If you want to show something more meaningful when you do, say, System.out.println(aMoneyObject); then yes, you'll need to override toString.
http://developer.java.sun.com/developer/Books/effectivejava/Chapter3.pdf
What are data1 and data2? Those are meaningless names and you never use them.
As for handling errors,
http://java.sun.com/docs/books/tutorial/essential/exceptions/index.html
It's not clear what you're trying to accomplish, and your questions are rather vague, so it's difficult to provide useful advice.