// Changing the look and feel
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class PLAFApp extends JPanel
{
  Container thisPanel = this;

  private JLabel  lbl = new JLabel("Hi there");
  private JButton btn = new JButton("Hide it");
  private JButton nix = new JButton("Motif");
  private JButton win = new JButton("Windows");
  private JButton mtl = new JButton("Metal [Java]");

  public PLAFApp()
  {
    btn.addActionListener(new ActionListener()
    {
      public void actionPerformed(ActionEvent ae)
      {
        if (lbl.isVisible())
        {
          lbl.setVisible(false);
          btn.setLabel("Show it");
        }
        else
        {
          lbl.setVisible(true);
          btn.setLabel("Hide it");
        }
      }
    });
    add(lbl);
    add(btn);
    add(nix);
    add(win);
    add(mtl);

    nix.addActionListener(new ChangeFeel());
    win.addActionListener(new ChangeFeel());
    mtl.addActionListener(new ChangeFeel());
  }

  public class ChangeFeel implements ActionListener
  {
    public void actionPerformed(ActionEvent ae)
    {
      JButton clicked = (JButton) ae.getSource();

      try
      {
        if (clicked == nix)
          UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
        else if (clicked == win)
          UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        else if (clicked == mtl)
          UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");

        Container c = thisPanel;
        while (! (c instanceof JFrame))
          c = c.getParent();

        JFrame f = (JFrame) c;
        SwingUtilities.updateComponentTreeUI(f);
      }
      catch (Exception e) { e.printStackTrace(); }
    }
  }
  public static void main(String[] args)
  {
    PLAFApp pa = new PLAFApp();
    GApp app = new GApp("The First App", pa);
    app.setSize(250, 100);
    app.show();
  }
}