Set Look n Feel of java Swing

example:

String lookAndFeel = UIManager.getSystemLookAndFeelClassName(); // Set systems default theam
UIManager.setLookAndFeel(lookAndFeel);


to set other theam change the variable name "lookAndFeel" as follow

System ------->lookAndFeel = UIManager.getSystemLookAndFeelClassName();
Motif------------>lookAndFeel = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
GTK------------>lookAndFeel = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
Metal----------> UIManager.setLookAndFeel(new MetalLookAndFeel());


Reference: http://java.sun.com/docs/books/tutorial/uiswing/lookandfeel/plaf.html#dynamic


Example:

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

public class LookAndFeelDemo implements ActionListener {
private static String labelPrefix = "Number of button clicks: ";
private int numClicks = 0;
final JLabel label = new JLabel(labelPrefix + "0 ");

// Specify the look and feel to use by defining the LOOKANDFEEL constant
// Valid values are: null (use the default), "Metal", "System", "Motif",
// and "GTK"
final static String LOOKANDFEEL = "Metal";

// If you choose the Metal L&F, you can also choose a theme.
// Specify the theme to use by defining the THEME constant
// Valid values are: "DefaultMetal", "Ocean", and "Test"
final static String THEME = "Test";


public Component createComponents() {
JButton button = new JButton("I'm a Swing button!");
button.setMnemonic(KeyEvent.VK_I);
button.addActionListener(this);
label.setLabelFor(button);

JPanel pane = new JPanel(new GridLayout(0, 1));
pane.add(button);
pane.add(label);
pane.setBorder(BorderFactory.createEmptyBorder(
30, //top
30, //left
10, //bottom
30) //right
);

return pane;
}

public void actionPerformed(ActionEvent e) {
numClicks++;
label.setText(labelPrefix + numClicks);
}

private static void initLookAndFeel() {
String lookAndFeel = null;

if (LOOKANDFEEL != null) {
if (LOOKANDFEEL.equals("Metal")) {
lookAndFeel = UIManager.getCrossPlatformLookAndFeelClassName();
// an alternative way to set the Metal L&F is to replace the
// previous line with:
// lookAndFeel = "javax.swing.plaf.metal.MetalLookAndFeel";

}

else if (LOOKANDFEEL.equals("System")) {
lookAndFeel = UIManager.getSystemLookAndFeelClassName();
}

else if (LOOKANDFEEL.equals("Motif")) {
lookAndFeel = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
}

else if (LOOKANDFEEL.equals("GTK")) {
lookAndFeel = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
}

else {
System.err.println("Unexpected value of LOOKANDFEEL specified: "
+ LOOKANDFEEL);
lookAndFeel = UIManager.getCrossPlatformLookAndFeelClassName();
}

try {


UIManager.setLookAndFeel(lookAndFeel);

// If L&F = "Metal", set the theme

if (LOOKANDFEEL.equals("Metal")) {
if (THEME.equals("DefaultMetal"))
MetalLookAndFeel.setCurrentTheme(new DefaultMetalTheme());
else if (THEME.equals("Ocean"))
MetalLookAndFeel.setCurrentTheme(new OceanTheme());
else
MetalLookAndFeel.setCurrentTheme(new TestTheme());

UIManager.setLookAndFeel(new MetalLookAndFeel());
}




}

catch (ClassNotFoundException e) {
System.err.println("Couldn't find class for specified look and feel:"
+ lookAndFeel);
System.err.println("Did you include the L&F library in the class path?");
System.err.println("Using the default look and feel.");
}

catch (UnsupportedLookAndFeelException e) {
System.err.println("Can't use the specified look and feel ("
+ lookAndFeel
+ ") on this platform.");
System.err.println("Using the default look and feel.");
}

catch (Exception e) {
System.err.println("Couldn't get specified look and feel ("
+ lookAndFeel
+ "), for some reason.");
System.err.println("Using the default look and feel.");
e.printStackTrace();
}
}
}

private static void createAndShowGUI() {
//Set the look and feel.
initLookAndFeel();

//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);

//Create and set up the window.
JFrame frame = new JFrame("SwingApplication");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

LookAndFeelDemo app = new LookAndFeelDemo();
Component contents = app.createComponents();
frame.getContentPane().add(contents, BorderLayout.CENTER);

//Display the window.
frame.pack();
frame.setVisible(true);
}

public static void main(String[] args) {
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}