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PopupMenu and Mouse Event

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.JFrame; import javax.swing.JMenuItem; import javax.swing.JPopupMenu; import javax.swing.event.PopupMenuEvent; import javax.swing.event.PopupMenuListener; public class PopupSample {   public static void main(String args[]) {     ActionListener actionListener = new ActionListener() {       public void actionPerformed(ActionEvent actionEvent) {         System.out.println("Selected: "             + actionEvent.getActionCommand());       }     };     PopupMenuListener popupMenuListener = new PopupMenuListener() {       public void popupMenuCanceled(PopupMenuEvent popupMenuEvent) {         System.out.println("Canceled");       }       public void popupMenuWillBecomeInvisible(           PopupMenuEvent popupMenuEvent) {         System.out.println("Becoming Invisible");       }       public void popupMenuWillBecomeVisible(PopupMenuEvent popupMenuEvent) {         System.out.println("Becoming Visible");       }     };     JFrame frame = new JFrame("Popup Example");     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     JPopupMenu popupMenu = new JPopupMenu();     popupMenu.addPopupMenuListener(popupMenuListener);     JMenuItem cutMenuItem = new JMenuItem("Cut");     cutMenuItem.addActionListener(actionListener);     popupMenu.add(cutMenuItem);     JMenuItem copyMenuItem = new JMenuItem("Copy");     copyMenuItem.addActionListener(actionListener);     popupMenu.add(copyMenuItem);     JMenuItem pasteMenuItem = new JMenuItem("Paste");     pasteMenuItem.addActionListener(actionListener);     pasteMenuItem.setEnabled(false);     popupMenu.add(pasteMenuItem);     popupMenu.addSeparator();     JMenuItem findMenuItem = new JMenuItem("Find");     findMenuItem.addActionListener(actionListener);     popupMenu.add(findMenuItem);     MouseListener mouseListener = new JPopupMenuShower(popupMenu);     frame.addMouseListener(mouseListener);     frame.setSize(350, 250);     frame.setVisible(true);   } } class JPopupMenuShower extends MouseAdapter {   private JPopupMenu popup;   public JPopupMenuShower(JPopupMenu popup) {     this.popup = popup;   }   private void showIfPopupTrigger(MouseEvent mouseEvent) {     if (popup.isPopupTrigger(mouseEvent)) {       popup.show(mouseEvent.getComponent(), mouseEvent.getX(), mouseEvent           .getY());     }   }   public void mousePressed(MouseEvent mouseEvent) {     showIfPopupTrigger(mouseEvent);   }   public void mouseReleased(MouseEvent mouseEvent) {     showIfPopupTrigger(mouseEvent);   } }