Paint Method in Java Swing Example

import javax.swing.*; 
 import java.awt.*; 
 import java.awt.event.*; 
 public class JPaintMethodJavaExample extends JFrame implements ActionListener 
   { 
       JButton ClckBtn = new JButton("Click"); 
       public JPaintMethodJavaExample() 
            { 
                setTitle("Paint Method In java Swing"); 
                setLayout(new FlowLayout()); 
                setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
                add(ClckBtn); 
                ClckBtn.addActionListener(this); 
            } 
                public void actionPerformed(ActionEvent e1) 
                  { 
                     System.out.print("Button has been Clicked. "); 
                     repaint(); 
                  } 
                     public void paint(Graphics gr) 
                      { 
                           super.paint(gr); 
                           System.out.println("In paint method."); 
                      } 
                           public static void main(String[] aa) 
                            { 
                               JPaintMethodJavaExample frm = new JPaintMethodJavaExample(); 
                               frm.setSize(170,110); 
                               frm.setVisible(true); 
                           } 
    }