import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class CheckBoxDemoStress extends JPanel
                          implements ItemListener {
    JCheckBox aButton;
    JCheckBox bButton;
    JCheckBox cButton;

    StringBuffer choices;
    JLabel pictureLabel;

    public CheckBoxDemoStress() {
        super(new BorderLayout());

        JPanel checkPanel = new JPanel();
        
        //Create the check boxes.
        for (int i=0; i<1000; i++) {
            aButton = new JCheckBox((new Integer(i)).toString());
            //aButton.setMnemonic(KeyEvent.VK_A);
            aButton.setSelected(true);
            aButton.addItemListener(this);

            checkPanel.add(aButton);
        }
        
        add(checkPanel, BorderLayout.LINE_START);
        setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
    }

    /** Listens to the check boxes. */
    public void itemStateChanged(ItemEvent e) {
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("CheckBoxDemoStress");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        JComponent newContentPane = new CheckBoxDemoStress();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}