Changing the look and feel of components in java

//Changing the look and feel of components in java swing
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){}
     }

    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);
    }
}
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