Java Swing How to - Show JPopupMenu on left click

Question

We would like to know how to show JPopupMenu on left click.
Answer

import java.awt.Dimension;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
/* w  w  w  .  j  a va 2 s. c o m*/
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;

public class Main {
  public static void main(String[] args) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(new PopupMenu());
    frame.validate();
    frame.pack();
    frame.setVisible(true);
  }
}

class PopupMenu extends Box {
  Dimension preferredSize = new Dimension(400, 30);
  public PopupMenu() {
    super(BoxLayout.Y_AXIS);
    final JPopupMenu menu = new JPopupMenu("Options");
    for (int i = 1; i < 20; i++)
      menu.add(new JMenuItem("Option" + i));

    JLabel clickMe = new JLabel("ClickMe");
    clickMe.setAlignmentX(RIGHT_ALIGNMENT);
    clickMe.addMouseListener(new MouseAdapter() {
      @Override
      public void mouseClicked(MouseEvent e) {
        menu.show(e.getComponent(), e.getX(), e.getY());
      }
    });
    add(clickMe);
  }
  public Dimension getPreferredSize() {
    return preferredSize;
  }
}