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Thread: Using values in different classes

  1. #1
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    Default Using values in different classes

    Okay, I'm wondering if it's possible to use a value from one class in another class. Specifically, a JTextField value. I think I know how to do it normally:

    First class:
     
     
    public String textFieldValue()
    {
    return x;
    }
     
    Second class:
     
    System.out.println(FirstClass.x);

    But in my code, a button must first be pressed (using an action listener) to get the JTextField values. This means that I have to use this:

    public void actionPerformed(ActionEvent e) {
    //get JTextField values
    }

    As you probably know, you can't return any values within a void method so I have no idea how to get these values to another class.


  2. #2
    Administrator copeg's Avatar
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    Default Re: Using values in different classes

    I'm a bit unclear on the question, so perhaps more code is in order. If you follow encapsulation guidelines, variables will be private and accessed via getters and setters
    //Demo class with a single private variable
    public class A{
        private int val = 0;
     
        public int getVal(){
            return val;
        }
    }
    //Demo class which accesses A
    public class B{
        A a = new A();
     
        public void function(){
            int val = a.getVal();
            //do something with val
        }
    }

  3. #3
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    Default Re: Using values in different classes

    Hi Copeg, I believe you helped me with my other problem The code you showed I understand, however my problem is a bit different. I want to get a variable (which happens to be under a void method, so I can't return its value) to be accessible by another class. I don't know how to do this for the exact reason I mentioned in the parenthesis. Putting "public" in front of the variable doesn't do anything because the value for that variable changes after I run the class.
    Last edited by The_Mexican; November 19th, 2010 at 07:08 PM. Reason: Grammer

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