Java Programming Tutorial - 77 - Adapter Classes

import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JLabel;
import javax.swing.JFrame;

class Mouse extends JFrame {
   private JLabel statusBar;
   private String details = "Go on - do something!";

   public static void main(String args[ ]) {
      Mouse gui = new Mouse();
      gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      gui.setSize(350, 200);
      gui.setVisible(true);
   }

   Mouse() {
      super("imba listener");

      statusBar = new JLabel(details);
      add(statusBar, BorderLayout.SOUTH);
      addMouseListener(new MouseHandler());
   }

   private class MouseHandler extends MouseAdapter {
      public void mouseClicked(MouseEvent event) {
         details = String.format("You clicked %d times ", event.getClickCount());

         if(event.isMetaDown())
            statusBar.setText(details + "with right mouse button.");
         else if(event.isAltDown())
            statusBar.setText(details + "with middle mouse button.");
         else
            statusBar.setText(details += "with left mouse button.");
      }
   }
}