Panel de colores en java

import java.awt.*;
import java.awt.event.*;

// Java extension packages
import javax.swing.*;

public class ShowColors2 extends JFrame {
private JButton changeColorButton;
private Color color = Color.lightGray;
private Container container;

// set up GUI
public ShowColors2()
{
super( "Using JColorChooser" );
container = getContentPane();
container.setLayout( new FlowLayout() );

// set up changeColorButton and register its event handler
changeColorButton = new JButton( "Change Color" );

changeColorButton.addActionListener(

// anonymous inner class
new ActionListener() {

// display JColorChooser when user clicks button
public void actionPerformed( ActionEvent event )
{
color = JColorChooser.showDialog(
ShowColors2.this, "Choose a color", color );

// set default color, if no color is returned
if ( color == null )
color = Color.lightGray;

// change content pane's background color
container.setBackground( color );
}

} // end anonymous inner class

); // end call to addActionListener

container.add( changeColorButton );

setSize( 400, 130 );
setVisible( true );
}

// execute application
public static void main( String args[] )
{
ShowColors2 application = new ShowColors2();

application.setDefaultCloseOperation(
JFrame.EXIT_ON_CLOSE );
}

}