JMenu.add(JMenuItem menuItem) has the following syntax.
public JMenuItem add(JMenuItem menuItem)
In the following code shows how to use JMenu.add(JMenuItem menuItem) method.
import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JSeparator; /*w w w. ja va 2s .c om*/ public class Main extends JFrame { public Main() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JMenuBar bar = new JMenuBar(); JMenu menu = new JMenu("File"); bar.add(menu); menu.add(new JMenuItem("Close")); menu.add(new JSeparator()); // SEPARATOR menu.add(new JMenuItem("Exit")); setJMenuBar(bar); add(new JLabel("A placeholder")); pack(); setSize(300, 300); setVisible(true); } public static void main(String arg[]) { new Main(); } }