SWING(Popup)

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

public class PopupTest extends JFrame
{
private JRadioButtonMenuItem items[];
private Color colorValues[] = { Color.blue, Color.yellow, Color.red };

public PopupTest()
{
super( "Using JPopupMenus" );

final JPopupMenu popupMenu = new JPopupMenu();
ItemHandler handler = new ItemHandler();
String colors[] = { "Blue", "Yellow", "Red" };
ButtonGroup colorGroup = new ButtonGroup();
items = new JRadioButtonMenuItem[ 3 ];

// construct each menu item and add to popup menu; also
// enable event handling for each menu item
for ( int i = 0; i < items.length; i++ )
{
items[ i ] = new JRadioButtonMenuItem( colors[ i ] );
popupMenu.add( items[ i ] );
colorGroup.add( items[ i ] );
items[ i ].addActionListener( handler );
}

getContentPane().setBackground( Color.white );

// define a MouseListener for the window that displays
// a JPopupMenu when the popup trigger event occurs
addMouseListener( new MouseAdapter()
{
public void mousePressed( MouseEvent e )
{
checkForTriggerEvent( e );
}

public void mouseReleased( MouseEvent e )
{
checkForTriggerEvent( e );
}

private void checkForTriggerEvent( MouseEvent e )
{
if ( e.isPopupTrigger() )
popupMenu.show( e.getComponent(), e.getX(), e.getY() );
}
} );

setSize( 300, 200 );
show();
}

public static void main( String args[] )
{
PopupTest app = new PopupTest();

app.addWindowListener( new WindowAdapter()
{
public void windowClosing( WindowEvent e )
{
System.exit( 0 );
}
});
}

private class ItemHandler implements ActionListener
{
public void actionPerformed( ActionEvent e )
{
// determine which menu item was selected
for ( int i = 0; i < items.length; i++ )
if ( e.getSource() == items[ i ] )
{
getContentPane().setBackground( colorValues[ i ] );
repaint();
return;
}
}
}
}