user519670 user519670 - 2 years ago 110
Java Question

How to add action listener that listens to multiple buttons

I'm trying to figure out what i am doing wrong with action listeners. I'm following multiple tutorials and yet netbeans and eclipse are giving me errors when im trying to use an action listener.

Below is a simple program that im trying to get a button working in.

What am i doing wrong?

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;

public class calc extends JFrame implements ActionListener {

public static void main(String[] args) {

JFrame calcFrame = new JFrame();

calcFrame.setSize(100, 100);

JButton button1 = new JButton("1");


public void actionPerformed(ActionEvent e) {
if(e.getSource() == button1)


the action listener is never registered because with the
if(e.getSource() == button1)
it cant see
, errors saying cannot find symbol.

Answer Source

There is no this pointer in a static method. (I don't believe this code will even compile.)

You shouldn't be doing these things in a static method like main(); set things up in a constructor. I didn't compile or run this to see if it actually works, but give it a try.

public class Calc extends JFrame implements ActionListener {

    private Button button1;

    public Calc()
        this.setSize(100, 100);

        this.button1 = new JButton("1");

    public static void main(String[] args) {

        Calc calc = new Calc();

    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == button1)

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