14.3.java.java

// Fig. 14.3: CustomPanelTest.java
 // Using a customized Panel object.
 import java.awt.*;
 import java.awt.event.*;
 import javax.swing.*;

 public class Main extends JFrame {
 private JPanel buttonPanel;
 private Main myPanel;
 private JButton circleButton, squareButton;

 // set up GUI
 public Main()
 {
 super( "CustomPanel Test" );

 // create custom drawing area
 myPanel = new Main();
 myPanel.setBackground( Color.GREEN );

 // set up squareButton
 squareButton = new JButton( "Square" );
 squareButton.addActionListener(
   new ActionListener() { // anonymous inner class

 // draw a square
 public void actionPerformed( ActionEvent event )
 {
 myPanel.draw( Main.SQUARE );
 }

 } // end anonymous inner class

 ); // end call to addActionListener

 circleButton = new JButton( "Circle" );
 circleButton.addActionListener(

 new ActionListener() { // anonymous inner class

 // draw a circle
 public void actionPerformed( ActionEvent event )
 {
 myPanel.draw( CustomPanel.CIRCLE );
 }

 } // end anonymous inner class

 ); // end call to addActionListener
   // set up panel containing buttons
 buttonPanel = new JPanel();
 buttonPanel.setLayout( new GridLayout( 1, 2 ) );
 buttonPanel.add( circleButton );
 buttonPanel.add( squareButton );

// attach button panel & custom drawing area to content pane
 Container container = getContentPane();
 container.add( myPanel, BorderLayout.CENTER );
 container.add( buttonPanel, BorderLayout.SOUTH );

 setSize( 300, 150 );
 setVisible( true );

 } // end constructor CustomPanelTest

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

 } // end class CustomPanelTest