import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.*;
import javax.swing.*;

//Class Declaration
class SwingUI extends JFrame implements ActionListener {

//Instance variables
   JLabel text, clicked;
   JButton button;
   JPanel panel; 
   private boolean _clickMeMode = true;

//Constructor
   SwingUI(){ //Begin Constructor
     text = new JLabel("I'm a Simple Program");
     button = new JButton("Click Me");
     button.addActionListener(this);
     panel = new JPanel();
     panel.setLayout(new BorderLayout());
     panel.setBackground(Color.white);
     getContentPane().add(panel);
     panel.add(BorderLayout.CENTER, text);
     panel.add(BorderLayout.SOUTH, button);
   } //End Constructor

//Event handling
public void actionPerformed(ActionEvent event){
  Object source = event.getSource();
   if (source == button) {
      if (_clickMeMode) {
         text.setText("Button Clicked");
         button.setText("Click Again");
         _clickMeMode = false;
       } else {
         text.setText("I'm a Simple Program");
         button.setText("Click Me");
         _clickMeMode = true;
       }
   }
}

//main method
public static void main(String[] args){
     SwingUI frame = new SwingUI();
     frame.setTitle("Example");
     WindowListener l = new WindowAdapter() {
       public void windowClosing(WindowEvent e) {
         System.exit(0);
       }
     };
     frame.addWindowListener(l);
     frame.pack();
     frame.setVisible(true);
  }
}