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