Swing Components Java


            import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FibonacciTest extends JApplet implements ActionListener
 {
 JLabel numLabel, resultLabel;
 JTextField num, result;
 public void init()
 {
 Container c = getContentPane();
 c.setLayout( new FlowLayout() );
 numLabel = new JLabel( "Enter an integer and press Enter" );
 c.add( numLabel );
 num = new JTextField( 10 );
 num.addActionListener( this );
 c.add( num );
 resultLabel = new JLabel( "Fibonacci value is" );
 c.add( resultLabel );
 result = new JTextField( 15 );
 result.setEditable( false );
 c.add( result );
 }
 public void actionPerformed( ActionEvent e )
 {
 long number, fibonacciValue;
 number = Long.parseLong( num.getText() );
 showStatus( "Calculating ..." );
 fibonacciValue = fibonacci( number );
 showStatus( "Done." );
 result.setText( Long.toString( fibonacciValue ) );
 }
 // Recursive definition of method fibonacci
 public long fibonacci( long n )
 {
 if ( n == 0 || n == 1 ) // base case
 return n;
 else
 return fibonacci( n - 1 ) + fibonacci( n - 2 );
 }
}