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

public class ChangeLookAndFeel extends JFrame implements ActionListener {
    // button panel
    private JPanel buttonPanel = new JPanel();
    
    public ChangeLookAndFeel() {
	buttonPanel.setLayout(new GridLayout(1, 3, 4, 4));
	
	// Create the buttons.
	JButton b = new JButton("Metal");
	b.addActionListener( this );
	buttonPanel.add( b );
	b = new JButton("Windows");
	b.addActionListener( this );
	buttonPanel.add( b );
	b = new JButton("Motif");
	b.addActionListener( this );
	buttonPanel.add( b );
	
	// Layout.
	Container c = getContentPane();
	c.setLayout(new BorderLayout());
	c.add(new JLabel("Select a look and feel"), BorderLayout.NORTH);
	c.add(buttonPanel, BorderLayout.CENTER);
	
	addWindowListener(new WindowAdapter() {
		public void windowClosing(WindowEvent e) {
		    System.exit(0);
		}
	    });
	
	pack();
	setVisible(true);
    }
    
    public void actionPerformed( ActionEvent e ) {
	try {
	    //One call to UIManager.setLookAndFeel is all it takes to
	    //change the apperance of the entire application.
	    if ( e.getActionCommand().equals( "Metal" ) ) 
		UIManager.setLookAndFeel( new javax.swing.plaf.metal.MetalLookAndFeel() );
	    else if ( e.getActionCommand().equals( "Windows" ) ) 
		UIManager.setLookAndFeel( new com.sun.java.swing.plaf.windows.WindowsLookAndFeel() );
	    else if ( e.getActionCommand().equals( "Motif" ) ) 
		UIManager.setLookAndFeel( new com.sun.java.swing.plaf.motif.MotifLookAndFeel() );
	} catch ( UnsupportedLookAndFeelException ex ) {
	    System.out.println( ex.getMessage() ); 
	}
	
	//Make the components redraw themselfs using the new look and feel.
	SwingUtilities.updateComponentTreeUI( this );
    }
    
    public static void main(String[] args) {
	new ChangeLookAndFeel();
    }
    
}