popuptest.java

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//popup menu
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;

public class PopupTest extends JFrame
{
	private JRadioButtonMenuItem items[];
	private Color colorValues[] = {Color.blue,Color.yellow,Color.red};
	
	private JPopupMenu popmenu;
	
	public PopupTest()
	{
			super("Popup Test");
			
			ItemHandler handler  = new ItemHandler();
			String colors[] = {"Blue","Yellow" ,"Red"};
			
			//set up popup menu and its items
			ButtonGroup colorGroup = new ButtonGroup();
			popmenu = new JPopupMenu();
			items = new JRadioButtonMenuItem[3];
			
			//construct each menu item and add to popup menu
			//aoso enable event handling for each menu item
			for(int count = 0;count<items.length;count++)
			{
					items[count] = new JRadioButtonMenuItem(colors[count]);
					popmenu.add(items[count]);
					colorGroup.add(items[count]);
					
					items[count].addActionListener(handler);
				}
			getContentPane().setBackground(Color.white);
			
			addMouseListener(new MouseAdapter()
			{
					public void mousePressed(MouseEvent e)
					{
							System.out.println("Pressed  @@");
							checkForTriggerEvent(e);
						}
					public void mouseReleased(MouseEvent e)
					{
							System.out.println("Releaseed @@");
							checkForTriggerEvent(e);
							
						}
					private void checkForTriggerEvent(MouseEvent e)
					{
						if(e.isPopupTrigger())
						  popmenu.show(e.getComponent(),e.getX(),e.getY());
						}
				});
				setSize(500,500);
				setVisible(true);
		}
		public static void main(String[]args)
		{
				PopupTest pt = new PopupTest();
				pt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				
			}
		private class ItemHandler implements ActionListener
		{
				public void actionPerformed(ActionEvent e)
				{
					for(int i = 0;i<items.length;i++)
					{
							if(e.getSource() == items[i])
							 { getContentPane().setBackground(colorValues[i]);
							  repaint();
					      return;
					    }
						}
					
					}
			}
}