Java - Using the output from one class in another

Question

I'm trying to write a program that takes the output of adding two numbers in one class together and adds it to a different number. Here is the first class:

public class Add{
    public static void main(String[] args) {

        int a = 5;
        int b = 5;
        int c = a + b;
        System.out.println(c);

        }   
}

And the second:

public class AddExtra{
    public static void main(String[] args) {

    Add a = new Add();

    int b = 5;
    int c = a.value+b;

    System.out.println(c);
    }   
}

How do I get this to work? Thanks.

Hovercraft Full Of Eels · Accepted Answer · 2013-06-07 02:31:47Z

1

Suggestions:

You need to give the Add class a public add(...) method,
have this method accept an int parameter,
have it add a constant int to the int passed in,
and then have it return the sum.
If you want it to add two numbers, rather than a number and a constant, then give the method two int parameters, and add them together in the method.

Then create another class,

In this other class you can create an Add instance,
call the add(myInt) method,
and print the result returned.

answered Jun 7, 2013 at 2:31

Hovercraft Full Of Eels

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Comments

tckmn · Accepted Answer · 2013-06-07 02:27:50Z

0

You could try

public class Add{
    public int c; // public variable

    public Add() { // This is a constructor
                   // It will run every time you type "new Add()"
        int a = 5;
        int b = 5;
        c = a + b;
    }   
}

Then, you can do this:

public class AddExtra{
    public static void main(String[] args) {
        Add a = new Add(); // Here, the constructor is run

        int b = 5;
        int c = a.c + b; // Access "a.c" because "c" is a public variable now

        System.out.println(c);
    }   
}

2 Comments

Tim S. Over a year ago

I hope you wouldn't actually advise making a public field. For learning purposes, maybe.

tckmn Over a year ago

@TimS. Yes, partly, but in this case there is really no need to add a getter (or setter). In this small example it would really not be needed.

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