Grid Layout Demo

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

 public class GridLayoutDemo extends JFrame
 implements ActionListener {
 private JButton b[];
 private String names[] =
 { "one", "two", "three", "four", "five", "six" };
 private boolean toggle = true;
 private Container c;
 private GridLayout grid1, grid2;

 public GridLayoutDemo()
 {
 super( "GridLayout Demo" );

 grid1 = new GridLayout( 2, 3, 5, 5 );
 grid2 = new GridLayout( 3, 2 );

 c = getContentPane();
 c.setLayout( grid1 );

 // create and add buttons
 b = new JButton[ names.length ];

 for (int i = 0; i < names.length; i++ ) {
 b[ i ] = new JButton( names[ i ] );
 b[ i ].addActionListener( this );
 c.add( b[ i ] );
 }

 setSize( 300, 150 );
 show();
 }

 public void actionPerformed( ActionEvent e )
 {
 if ( toggle )
 c.setLayout( grid2 );
 else
 c.setLayout( grid1 );

 toggle = !toggle;
 c.validate();
 }

 public static void main( String args[] )
 {
 GridLayoutDemo app = new GridLayoutDemo();

 app.addWindowListener(
 new WindowAdapter() {

 public void windowClosing( WindowEvent e )
 {
 System.exit( 0 );
 }
 }
 );
 }
 }