<code java>
package prolog;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import jpl.Atom;
import jpl.JPL;
import jpl.Query;
import jpl.Term;
import jpl.Variable;

@SuppressWarnings({ "unchecked", "deprecation", "serial" })
public class JavaProlog extends JFrame {

	JButton 	startButton = new JButton("Start");
	JTextArea 	textArea	= new JTextArea("This program diagnoses why a car won''t start.\n" +
											"Answer all questions with Y for yes or N for no.");

	/**
	 * Konstruktor - towrzy okienko z przyciskiem ktory wywoluje prologa
	 */
	JavaProlog(){
		Container cp=getContentPane();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		setLocation	(200,200);
		setSize		(300,200);
		setLayout	(new FlowLayout());
		
		
		startButton.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e){
				startDiagnose();
			}
		});
		
		cp.add(textArea2);
		cp.add(textArea);
		cp.add(startButton);
		
		setVisible(true);	
	}
	
	private void startDiagnose(){
		Query queryConsult = new Query("consult", new Atom("pl/carJPL.pl"));
		queryConsult.query();
		
		Query start = new Query("start");
		start.query();
	}
	
	
	public static void main( String argv[] ){
		JPL.init();
		
		JavaProlog jpTest = new JavaProlog();
		
	}/***** main *****/
}/**===  JavaProlog  ===*/
</code>