Example of java swing

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JButton;

public class Tutorial extends JFrame
{

JPanel jp=new JPanel();
JLabel jl=new JLabel();
JTextField jt=new JTextField(30);
JButton jb=new JButton("Enter");

public Tutorial()
{

setTitle("Tutorial");
setVisible(true);
setSize(400,200);
setDefaultCloseOperation(EXIT_ON_CLOSE);

jp.add(jt);
 jt.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String input=jt.getText();
jl.setText(input);
}
});

jp.add(jb);
jb.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String input=jt.getText();
jl.setText(input);
}
});

jp.add(jl);
add(jp);
}
public static void main(String args[])
{
 try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Tutorial.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Tutorial.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Tutorial.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Tutorial.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
Tutorial t=new Tutorial();
}
}