Re: Buttons and Event Handlers

Knute Johnson <>
Sun, 21 Feb 2010 15:46:29 -0800
On 2/21/2010 3:26 PM, Nessuno wrote:


I am a newbie in Java. While learning from the Horstmann I have
modified a little example from the book. The problem is that the
buttons it creates are never shown.

Please, would someone explain what I am missing? The code follows.
Thanks in advance to everyone who will reply.


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

public class ButtonTest
    public static void main( String[] args )
        EventQueue.invokeLater(new Runnable()
            public void run()
                ButtonFrame frame = new ButtonFrame();

class ButtonFrame extends JFrame
    public ButtonFrame()
        setSize(300, 200);
        buttonPanel = new JPanel();
        makeButton("Red", Color.RED);
        makeButton("Green", Color.GREEN);
        makeButton("Blue", Color.BLUE);



    private void makeButton(String name, final Color backgroundColor)
        JButton button = new JButton(name);
        button.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent event)



    private JPanel buttonPanel;

You need to add the buttonPanel to the JFrame.


Knute Johnson
email s/nospam/knute2010/

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