JMenuBar.setBorderPainted(boolean b) has the following syntax.
public void setBorderPainted(boolean b)
In the following code shows how to use JMenuBar.setBorderPainted(boolean b) method.
import java.awt.event.KeyEvent; //from ww w .j a va 2 s. c o m import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JRadioButtonMenuItem; public class Main { public static void main(String args[]) { JFrame f = new JFrame("JRadioButtonMenuItem Sample"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JMenuBar bar = new JMenuBar(); bar.addNotify(); JMenu menu = new JMenu("Options"); menu.setMnemonic(KeyEvent.VK_O); ButtonGroup group = new ButtonGroup(); JRadioButtonMenuItem menuItem = new JRadioButtonMenuItem("A"); group.add(menuItem); menu.add(menuItem); menuItem = new JRadioButtonMenuItem("B"); group.add(menuItem); menu.add(menuItem); menuItem = new JRadioButtonMenuItem("C"); group.add(menuItem); menu.add(menuItem); bar.add(menu); bar.setBorderPainted(false); f.setJMenuBar(bar); f.setSize(300, 200); f.setVisible(true); } }