<code java>
package miw2;

import java.awt.BorderLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.Box;
import javax.swing.JButton;
import javax.swing.JTextArea;

/**
 * Class for controling programs in prolog. Constructor arguments are buttons used for controling the aplication,
 * to close aplication press X on ControlForm.
 * @author  Filip
 */
public class ControlForm extends javax.swing.JFrame {

    /**
     * Command wchich was choosed.
     */
    private static int command = -1;
    /**
     * State if any button was pressed.
     */
    private static boolean enable = false;
    /**
     * Singleton variable to avoid duplicated Control Forms.
     */
    private static ControlForm form;
    /**
     * List of commands' buttons.
     */
    private static List<JButton> buttonList;
    /**
     * Instruction how to use ControlForm.
     */
    private static JTextArea textA;
    /**
     * Box for commands' buttons.
     */
    public static Box bx;

    /**
     * Create ControlForm with given instruction and command buttons. Exit button is not used, close ConrtolForm
     * by pressing the x.
     * @param text instruction.
     * @param buttons command buttons.
     */
    public ControlForm(String text, String[] buttons) {
            if(form == null){
            form = new ControlForm();
            form.setDefaultCloseOperation(ControlForm.EXIT_ON_CLOSE);
            form.setLayout(new BorderLayout());
            textA = new JTextArea(text);
            form.add(textA,BorderLayout.NORTH);
            form.setTitle("CONTROL PANEL");
            buttonList = new ArrayList<JButton>();
            bx = Box.createHorizontalBox();
            for (String str : buttons) {
                buttonList.add(new JButton(str));
                bx.add(buttonList.get(buttonList.size()-1),BorderLayout.SOUTH);
                buttonList.get(buttonList.size()-1).addMouseListener(new MyMouseListener());
            }
            form.add(bx);
            form.pack();
            
            form.setVisible(true);
            }
    }

    /**
     * Default ControForm constructor.
     */
    public ControlForm() {
    }

    /**
     * Do loop until any command button is pressed.
     * @return command.
     */
    public static int getValue() {
        try {
            while (!enable) {
                Thread.sleep(100);
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        enable = false;
        return command;
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 244, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 204, Short.MAX_VALUE)
        );

        pack();
    }// </editor-fold>                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new ControlForm("Text", new String[]{"one", "two"});
            }
        });
    }
    private class MyMouseListener implements MouseListener{

        public void mouseClicked(MouseEvent e) {
            int i=0;
            for(JButton but: buttonList){
                if(e.getComponent().equals(but)){
                    command = i;
                    enable = true;
                    break;
                }
                i++;
            }
        }

        public void mousePressed(MouseEvent e) {
            //throw new UnsupportedOperationException("Not supported yet.");
        }

        public void mouseReleased(MouseEvent e) {
            //throw new UnsupportedOperationException("Not supported yet.");
        }

        public void mouseEntered(MouseEvent e) {
            //throw new UnsupportedOperationException("Not supported yet.");
        }

        public void mouseExited(MouseEvent e) {
            //throw new UnsupportedOperationException("Not supported yet.");
        }


    }
    // Variables declaration - do not modify                     
    // End of variables declaration                   
}

</code>