// Purpose.  GridBagLayout demo  [source: Flanagan97b, p116]

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

public class LayoutGridBagDemo {
   public static void main( String[] args ) {
      JFrame frame = new JFrame( "JButton demo" );
      frame.addWindowListener( new WindowAdapter() {
         public void windowClosing( WindowEvent e ) { System.exit( 0 ); } } );

      frame.getContentPane().setLayout( new GridBagLayout() );
      GridBagConstraints c = new GridBagConstraints();
      c.fill = GridBagConstraints.BOTH;  // components grow in both dimensions
      c.insets = new Insets(5,5,5,5);    // 5-pixel margins on all sides

      c.gridx = 0;      c.gridy = 0;
      c.gridwidth = 4;  c.gridheight = 4;
      c.weightx = 1.0;  c.weighty = 1.0; // this button gets all extra space
      frame.getContentPane().add( new Button("Button #1"), c );

      c.gridx = 4;      c.gridy = 0;
      c.gridwidth = 1;  c.gridheight = 1;
      c.weightx = 0.0;  c.weighty = 0.0;
      frame.getContentPane().add( new Button("Button #2"), c );

      c.gridx = 4;      c.gridy = 1;
      c.gridwidth = 1;  c.gridheight = 1;
      frame.getContentPane().add( new Button("Button #3"), c );

      c.gridx = 4;      c.gridy = 2;
      c.gridwidth = 1;  c.gridheight = 2;
      frame.getContentPane().add( new Button("Button #4"), c );

      c.gridx = 0;      c.gridy = 4;
      c.gridwidth = 1;  c.gridheight = 1;
      frame.getContentPane().add( new Button("Button #5"), c );

      c.gridx = 2;      c.gridy = 4;
      c.gridwidth = 1;  c.gridheight = 1;
      frame.getContentPane().add( new Button("Button #6"), c );

      c.gridx = 3;      c.gridy = 4;
      c.gridwidth = 2;  c.gridheight = 1;
      frame.getContentPane().add( new Button("Button #7"), c );

      c.gridx = 1;      c.gridy = 5;
      c.gridwidth = 1;  c.gridheight = 1;
      frame.getContentPane().add( new Button("Button #8"), c );

      c.gridx = 3;      c.gridy = 5;
      c.gridwidth = 1;  c.gridheight = 1;
      frame.getContentPane().add( new Button("Button #9"), c );

      frame.pack();
      frame.setVisible( true );
   }
}