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Thread: Is there a wrapper for non-static field to be able accesed by static method?

  1. #1
    Junior Member
    Join Date
    Mar 2012
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    Default Is there a wrapper for non-static field to be able accesed by static method?

    Hi all,
    I have a little problem. I create a GUI Application using Netbeans IDE 7.1. I want to pass a string from static method to the JTextArea. Here is the problem:
    1. the JTextaArea variable name is declared non-static by IDE (I can't even modify it to static type).
    2. the method to which I want to pass the JTextArea is static (surely I can't modify it since its a third party library).

    Here is the snippet declaration by Netbeans GUI:

    // Variables declaration - do not modify
    private javax.swing.JLabel machinePortLabel;
    private javax.swing.JTextField machinePortTextField;
    private javax.swing.JTextArea machineLoggingTextField;
    // End of variables declaration

    Here is the the static method:

    public class MachineAgent extends Agent{
    private boolean finished = false;
    final String newline = "\n";

    public void setup() {
    addBehaviour(new SimpleBehaviour() {
    private static final long serialVersionUID = 1L;

    public void action() {
    MachineFrame.getMachineLoggingTextField().getText( ); //Compiler complain "non-static method //getMachineLoggingTextField() can not be referenced from a static context.

    public boolean done() {
    return finished;

    Can anyone offer a solution to the problem? A useful hint or clue will be appreciated. Thanks.

  2. #2
    Super Moderator Norm's Avatar
    Join Date
    May 2010
    Eastern Florida
    Thanked 2,710 Times in 2,660 Posts

    Default Re: Is there a wrapper for non-static field to be able accesed by static method?

    want to pass a string from static method to the JTextArea.
    Not sure what the problem is. You can always call a static method to get a String that can be put into a text field.
    aTextField.setText(ClassName.staticMethod()); // set value of textfield using value from a static method.

    Or are you doing it the other way? Trying to get to a non static field in some class from a static method? Then you need a reference to a class object:
    staticTextField.setText(aRefToClassObject.nonStati cMethod());
    Last edited by Norm; April 3rd, 2012 at 06:35 AM.
    If you don't understand my answer, don't ignore it, ask a question.

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