java - Change Variable from the inside of a ActionListener

Question

Is it possible to change a variable from inside of a ActionListener?

I mean somthing like this:

    boolean test = false;

    button.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
            test = true;
        }
    });

I want to change test to true when someone presses the button.

Answer 1

I'm not sure if this helps you but if you are using a action listener I'm guessing you are working with javas swing api. In that case you are maybe extending a class like JFrame or something like that so you could use this:

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class MyFrame extends JFrame {

    private boolean booleanToChange = false;

    private JButton exampleButton;

    public MyFrame() {
        exampleButton = new JButton();
        exampleButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                //Access a member in anonymous class
                MyFrame.this.booleanToChange = true;
            }
        });
    }
}

And here the explanation why it has to be final :) hope this helps a bit