Java Event Handler Anonymous Inner Class

// Demonstrate the key event handlers.
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

class SimpleKey extends JTextArea {

  public SimpleKey() {
    addMouseListener(new MouseAdapter() {
      // Handle mouse clicked.
      public void mouseClicked(MouseEvent me) {
        System.out.println("Mouse clicked");
      }// w  ww .  j a va  2  s .c om
    });
    addMouseMotionListener(new MouseMotionAdapter() {
      public void mouseDragged(MouseEvent me) {
        System.out.println("Mouse dragged");
      }
    });
  }
  
}

public class Main {
  public static void main(String args[]) {
    // Create the frame on the event dispatching thread.
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
        // Create a new JFrame container.
        JFrame jfrm = new JFrame("java2s.com");

        // Give the frame an initial size.
        jfrm.setSize(220, 200);

        // Terminate the program when the user closes the application.
        jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // Add the label to the content pane.
        jfrm.add(new JScrollPane(new SimpleKey()));

        // Display the frame.
        jfrm.setVisible(true);

      }
    });
  }
}