?? popuptest.java
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class PopupTest extends JFrame {
private JRadioButtonMenuItem items[];
private Color colorValues[] = { Color.blue, Color.green, Color.red };
private JPopupMenu popupMenu;
public PopupTest(){
super( "Using JPopupMenus" );
ItemHandler handler = new ItemHandler();
String colors[] = { "Blue", "Green", "Red" };
ButtonGroup colorGroup = new ButtonGroup();
popupMenu = new JPopupMenu();
items = new JRadioButtonMenuItem[ 3 ];
for ( int count = 0; count < items.length; count++ ) {
items[ count ] = new JRadioButtonMenuItem( colors[ count ] );
popupMenu.add( items[ count ] );
colorGroup.add( items[ count ] );
items[ count ].addActionListener( handler );
}
getContentPane().setBackground( Color.white );
addMouseListener( new MouseAdapter() {
public void mousePressed( MouseEvent event ){
checkForTriggerEvent( event );
}
public void mouseReleased( MouseEvent event ) {
checkForTriggerEvent( event );
}
private void checkForTriggerEvent( MouseEvent event ){
if ( event.isPopupTrigger() )
popupMenu.show( event.getComponent(), event.getX(), event.getY() );
}
});
setSize( 300, 200 );
setVisible( true );
}
public static void main( String args[] ){
PopupTest application = new PopupTest();
application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
}
private class ItemHandler implements ActionListener {
public void actionPerformed( ActionEvent event )
{
for ( int i = 0; i < items.length; i++ )
if ( event.getSource() == items[ i ] ) {
getContentPane().setBackground(colorValues[ i ] );
repaint();
return;
}
}
}
}
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