Tutorial sobre 'Always on Top'

public class frame extends JFrame implements WindowListener {

frame() {
...
addWindowListener(this);
...

        public void windowOpened(WindowEvent event){};

        public void windowActivated(WindowEvent event){};

        public void windowDeactivated(WindowEvent event){
            toFront();
        }

        public void windowIconified(WindowEvent event){};

        public void windowDeiconified(WindowEvent event){};

        public void windowClosed(WindowEvent event){};

        public void windowClosing(WindowEvent event) {};
    }