AWT(Demonstrating BorderLayout)

// Demonstrating BorderLayout.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class BorderLayoutDemo extends JFrame
implements ActionListener {
private JButton b[];
private String names[] =
{ "Hide North", "Hide South", "Hide East",
"Hide West", "Hide Center" };
private BorderLayout layout;

public BorderLayoutDemo()
{
super( "BorderLayout Demo" );

layout = new BorderLayout( 5, 5 );

Container c = getContentPane();
c.setLayout( layout );

// instantiate button objects
b = new JButton[ names.length ];

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

// order not important
c.add( b[ 0 ], BorderLayout.NORTH ); // North position
c.add( b[ 1 ], BorderLayout.SOUTH ); // South position
c.add( b[ 2 ], BorderLayout.EAST ); // East position
c.add( b[ 3 ], BorderLayout.WEST ); // West position
c.add( b[ 4 ], BorderLayout.CENTER ); // Center position

setSize( 300, 200 );
show();
}

public void actionPerformed( ActionEvent e )
{
for ( int i = 0; i < b.length; i++ )
if ( e.getSource() == b[ i ] )
b[ i ].setVisible( false );
else
b[ i ].setVisible( true );

// re-layout the content pane
layout.layoutContainer( getContentPane() );
}

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

app.addWindowListener(
new WindowAdapter() {
public void windowClosing( WindowEvent e )
{
System.exit( 0 );
}
}
);
}
}