// Fig. 13.10: ButtonDemo.java
// Creating JButtons.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ButtonDemo extends JFrame {
   private JButton button1;
   private JTextField tf1;
   private int counter;

   // set up GUI
   public ButtonDemo()
   {
      super( "Testing Buttons" );

      counter = 0;

      // get content pane and set its layout
      Container container = getContentPane();
      container.setLayout( new FlowLayout() );

      // create buttons
      button1 = new JButton( "Click Here" );
      container.add( button1 );

      
      tf1 = new JTextField( "   0   " );

      container.add( tf1 );

      // create an instance of inner class ButtonHandler
      // to use for button event handling 
      ButtonHandler handler = new ButtonHandler();
      button1.addActionListener( handler );

      setSize( 275, 300 );
      setVisible( true );

   } // end ButtonTest constructor

   public static void main( String args[] )
   { 
      ButtonDemo application = new ButtonDemo();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

   // inner class for button event handling
   private class ButtonHandler implements ActionListener {

      // handle button event
      public void actionPerformed( ActionEvent event )
      {
         counter++;
         tf1.setText("" + counter);
      }

   } // end private inner class ButtonHandler

} // end class ButtonTest

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