I have created a swings application and there is a \"Start\" button on the GUI. I want that whenever I clicked on that \"Start\" button, the start button should be disabled
This works.
public class TestButton {
public TestButton() {
    JFrame f = new JFrame();
    f.setSize(new Dimension(200,200));
    JPanel p = new JPanel();
    p.setLayout(new FlowLayout());
    final JButton stop = new JButton("Stop");
    final JButton start = new JButton("Start");
    p.add(start);
    p.add(stop);
    f.getContentPane().add(p);
    stop.setEnabled(false);
    stop.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            start.setEnabled(true);
            stop.setEnabled(false);
        }
    });
    start.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            start.setEnabled(false);
            stop.setEnabled(true);
        }
    });
    f.setVisible(true);
}
/**
 * @param args
 */
public static void main(String[] args) {
    new TestButton();
}
}