A java program for changing the look and feel of components.

                   

/**
 *
 * @author Parth
 */
//Changing the look and feel of components
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.*;
class LookFeel extends JFrame implements ItemListener
{
//vars
JButton b;
JCheckBox cb;

JTextField t;
JRadioButton r1, r2, r3;
ButtonGroup bg;
Container c;

LookFeel()
{
//create content pane
c = this.getContentPane();

//set flow layout to c
c.setLayout(null);

//create components
b = new JButton("Button");
cb = new JCheckBox("CheckBox");
t = new JTextField("TextField", 15);
r1 = new JRadioButton("Metal");
r2 = new JRadioButton("Motif");
r3 = new JRadioButton("Windows");

//create ButtonGroup object and add radio buttons to specify
//that they belong to same group
bg = new ButtonGroup();
bg.add(r1);
bg.add(r2);
bg.add(r3);

//set the location of components in content pane
b.setBounds(100,50,75,40);
cb.setBounds(100,100,100,40);
t.setBounds(100,150,100,40);
r1.setBounds(50,250,100,30);
r2.setBounds(150,250,100,30);
r3.setBounds(250,250,100,30);

//add the components to content pane
c.add(b);
c.add(cb);
c.add(t);
c.add(r1);
c.add(r2);
c.add(r3);
//add item listeners to radio buttons
r1.addItemListener(this);
r2.addItemListener(this);
r3.addItemListener(this);

//close the frame
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public void itemStateChanged(ItemEvent ie)
{

try{
  //know which radio button is selected and accordingly change
  //the look and feel

if(r1.getModel().isSelected())
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
if(r2.getModel().isSelected())
UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
if(r3.getModel().isSelected())
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

//change the look and feel in the content pane
SwingUtilities.updateComponentTreeUI(c);
}catch(Exception e){}
  }
}
class Demo
{
public static void main(String args[])
{
//create the frame
LookFeel lf = new LookFeel();
lf.setSize(400,400);
lf.setTitle("Look and Feel");
lf.setVisible(true);
}
}