Add action to a JButton created by another JButton

Question

I have a Jbutton that when pressed creates another button and the new button is added to the panel. How to I add an actionListener to the new button?

For example:

Answer 1

The newButton instance needs to have its actionPerformed method filled out. I see that you have an ActionListener added to the button, but that just means that someone is listing for actions. The code you show above doesn't define any actions on that newButton, so therefore there's no events being fired, and the ActionListener never gets notified of anything.

Answer 2

For each button you can create it's own actionPerformed(...) method, as described in the example below : Do you mean to do this :

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

public class ButtonAction
{
    private JPanel contentPane;
    private JButton updateButton;
    private int count = 0;
    private ActionListener updateListener = new ActionListener()
    {
        public void actionPerformed(ActionEvent ae)
        {
            final JButton button = new JButton("" +  count); 
            button.setActionCommand("" + count);
            button.addActionListener(new ActionListener()
            {
                public void actionPerformed(ActionEvent event)
                {
                    System.out.println("My COMMAND is : " + event.getActionCommand());
                }
            });
            SwingUtilities.invokeLater(new Runnable()
            {
                public void run()
                {
                    contentPane.add(button);
                    contentPane.revalidate();
                    contentPane.repaint();
                }
            });
            count++;
        }
    };

    private void createAndDisplayGUI()
    {
        JFrame frame = new JFrame("BUTTON ACTIONS");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationByPlatform(true);

        contentPane = new JPanel();
        contentPane.setLayout(new FlowLayout(FlowLayout.LEFT, 5, 5));

        updateButton = new JButton("UPDATE GUI");
        updateButton.addActionListener(updateListener);

        frame.add(contentPane, BorderLayout.CENTER);
        frame.add(updateButton, BorderLayout.PAGE_END);

        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String... args)
    {
        Runnable runnable = new Runnable()
        {
            public void run()
            {
                new ButtonAction().createAndDisplayGUI();
            }
        };
        SwingUtilities.invokeLater(runnable);
    }
}

Answer 3

One way would be to have a inner class containg the listener:

public void actionPerformed(ActionEvent event)
  {
    if (event.getSource() == button)
    {
      JButton newButton = new JButton("ahah");
      newButton.addMouseListener(new yourListener());
    }
   }  

//add this class as a inner class
   public class aListener extends MouseAdapter
   { 
      public void mouseClicked(MouseEvent e)
      {
         JButton buttonReference=(JButton)e.getSource(); // you want this since hardcoding the name of the button is bad if you want listeners for more then one button
         buttonReference.setText("lala");
      }
    }

This will create a instance of yourListener, and add that to the button when you click it