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calling a method in Java

Posted on 2014-02-20
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Last Modified: 2014-02-20
I'm using Eclipse IDE for Java Developer.

So in my java main method I set a variable like this:


sum = number1 + number2;

Then  I use this which displays my sum in a window.

// display the results
JOptionPane.showMessageDialog( null, "The sum is " + sum, "Results", JOptionPane.PLAIN_MESSAGE );

So this works correctly.



Now I'm trying to do something similar but I want to have the sum calculation in a method called sumNumbers.  So if my method looks like this how would I call this method using JOptionPane

public void sumNumbers(double number1, double number2) {
      double sum;
            
      sum = number1 + number2;
            
}


I tried something like this, but i don't think it's correct:

// display the results
JOptionPane.showMessageDialog( null, "The sum is " + sumNumbers(number1, number2), "Results", JOptionPane.PLAIN_MESSAGE );


Any know how I call a method with parameters using JOptionPane.showMessageDialog?
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Question by:maqskywalker
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6 Comments
 
LVL 37

Assisted Solution

by:zzynx
zzynx earned 1200 total points
ID: 39872789
>> "The sum is " + sumNumbers(number1, number2)
If you want to use it like this, your method should return the result:

public double sumNumbers(double number1, double number2) {
       return number1 + number2;
}
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LVL 23

Accepted Solution

by:
Michael Fowler earned 800 total points
ID: 39872808
Further to zzynx correct answer, the void keyword in your method signifies that the method does not return any value. As you can see in zzynx's response the method specifies that it returns a double value.
 
Have a look at this tutorial for more information
http://docs.oracle.com/javase/tutorial/java/javaOO/returnvalue.html
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LVL 1

Author Comment

by:maqskywalker
ID: 39872851
My question is on calling a method using JOptionPane.showMessageDialog

So then assuming my method looks like this:

public double sumNumbers(double number1, double number2) {
       return number1 + number2;
}




Is this how I would call it ?

JOptionPane.showMessageDialog( null, "The sum is " + sumNumbers(number1, number2), "Results", JOptionPane.PLAIN_MESSAGE );
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LVL 37

Expert Comment

by:zzynx
ID: 39872854
Yes!
Just try it.
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LVL 1

Author Comment

by:maqskywalker
ID: 39872860
thanks guys. your help worked.
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LVL 37

Expert Comment

by:zzynx
ID: 39872928
You're welcome.
Thanx 4 axxepting
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