Java Swing How to - Create Submenu on the Main menu

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Java Swing How to - Create Submenu on the Main menu

Menus are unique in that, by convention, they aren't placed with the other components in the UI. Instead, a menu usually appears either in a menu bar or as a popup menu. A menu bar contains one or more menus and has a customary, platform-dependent location — usually along the top of a window. A popup menu is a menu that is invisible until the user makes a platform-specific mouse action, such as pressing the right mouse button, over a popup-enabled component. The popup menu then appears under the cursor.

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

public class SubMenuExample {

    public static void main(final String args[]) {
        JFrame frame = new JFrame("MenuSample Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JMenuBar menuBar = new JMenuBar();

        // File Menu, F - Mnemonic
        JMenu fileMenu = new JMenu("File");
        fileMenu.setMnemonic(KeyEvent.VK_F);
        menuBar.add(fileMenu);

        // File->New, N - Mnemonic
        JMenuItem newMenuItem = new JMenuItem("New", KeyEvent.VK_N);
        fileMenu.add(newMenuItem);

        // Edit->Options Submenu, O - Mnemonic, at.gif - Icon Image File
        JMenu findOptionsMenu = new JMenu("Options");
        Icon atIcon = new ImageIcon("at.gif");
        findOptionsMenu.setIcon(atIcon);
        findOptionsMenu.setMnemonic(KeyEvent.VK_O);
        fileMenu.add(findOptionsMenu);

        // ButtonGroup for radio buttons
        ButtonGroup directionGroup = new ButtonGroup();

        // Edit->Options->Forward, F - Mnemonic, in group
        JRadioButtonMenuItem forwardMenuItem = new JRadioButtonMenuItem("Forward", true);
        forwardMenuItem.setMnemonic(KeyEvent.VK_F);
        findOptionsMenu.add(forwardMenuItem);
        directionGroup.add(forwardMenuItem);

        // Edit->Options->Backward, B - Mnemonic, in group
        JRadioButtonMenuItem backwardMenuItem = new JRadioButtonMenuItem("Backward");
        backwardMenuItem.setMnemonic(KeyEvent.VK_B);
        findOptionsMenu.add(backwardMenuItem);
        directionGroup.add(backwardMenuItem);


        frame.setJMenuBar(menuBar);
        frame.setSize(350, 250);
        frame.setVisible(true);
    }

}
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