Swing UI example in java

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

class SwingUI extends JFrame
     implements ActionListener {

   JLabel text, clicked;
   JButton button, clickButton;
   JPanel panel;
   private boolean _clickMeMode = true;

   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

   public void actionPerformed(ActionEvent event){
        Object source = event.getSource();
        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;
        }
   }

   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);
  }

}

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