I am making a simple game where numbers fall from top to bottom
and I have to type the number. (number is erased as I type the number)
This is coordinated with a Zen.java which is a JApplet file.
I am trying to make a menu for this game with a typical menu bar.
So far, I've tried this..
public class MenuApplet extends JApplet{
public void init(){
JMenuBar menubar = new JMenuBar();
JMenu menuOption = new JMenu("Option");
JMenuItem NewGame = new JMenuItem("New Game");
menuOption.add(NewGame);
JMenuItem exitGame = new JMenuItem("Exit Game");
menuOption.add(exitGame);
JMenu menuLevel = new JMenu("Level");
JMenuItem levelOne = new JMenuItem("Level One");
JMenuItem levelTwo = new JMenuItem("Level Two");
JMenuItem levelThree = new JMenuItem("Level Three");
}
}
Right before my main method. However, the menu bar doesn't even show up.
I would appreciate a couple of advices.
/* <applet code='MenuApplet' width=200 height=100></applet> */
import javax.swing.*;
public class MenuApplet extends JApplet{
public void init(){
JMenuBar menubar = new JMenuBar();
JMenu menuOption = new JMenu("Option");
JMenuItem NewGame = new JMenuItem("New Game");
menuOption.add(NewGame);
JMenuItem exitGame = new JMenuItem("Exit Game");
menuOption.add(exitGame);
JMenu menuLevel = new JMenu("Level");
JMenuItem levelOne = new JMenuItem("Level One");
JMenuItem levelTwo = new JMenuItem("Level Two");
JMenuItem levelThree = new JMenuItem("Level Three");
// the menu items, menus and menu bar all need
// to be ADDED to something!
menubar.add(menuOption);
menuOption.add(NewGame);
menuOption.add(exitGame);
menubar.add(menuLevel);
menuLevel.add(levelOne);
menuLevel.add(levelTwo);
menuLevel.add(levelThree);
setJMenuBar(menubar);
}
}
You have to add JMenu into JMenuBar and finally use setJMenuBar to set menubar object.
menubar.add(menuOption);
menubar.add(exitGame);
setJMenuBar(menubar);
Related
Just a simple GUI
Shows a JMenu >> JMenuItem
One of those menu items shows a JPopupMenu
My issue is that the JMenuItems' are setVisible(false) on press, by default
I've tried it with MouseAdapter too.
public class SubMenu extends JFrame
{
JMenuBar menubar = new JMenuBar();
JMenu File = new JMenu("File");
JMenuItem New = new JMenuItem("New");
JMenuItem Open = new JMenuItem("Open");
JMenuItem Save = new JMenuItem("Save");
JMenuItem Import = new JMenuItem("Import");
JPopupMenu Import_Popup = new JPopupMenu();
JMenuItem Import_Pop_1 = new JMenuItem("Import newsfeed list...");
JMenuItem Import_Pop_2 = new JMenuItem("Import bookmarks...");
JMenuItem Import_Pop_3 = new JMenuItem("Import mail...");
JMenuItem Exit = new JMenuItem("Exit");
SubMenu()
{
setTitle("SubMenu");
setSize(500, 500);
setLocation(200, 200);
setVisible(true);
setLayout(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
menubar.setBounds(0, 0, 2000, 30);
add(menubar);
menubar.add(File);
File.add(New);
File.add(Open);
File.add(Save);
File.add(new JSeparator());
File.add(Import);
File.add(new JSeparator());
File.add(Exit);
add(Import_Popup);
Import_Popup.add(Import_Pop_1);
Import_Popup.add(Import_Pop_2);
Import_Popup.add(Import_Pop_3);
// The issue is Right here.
Import.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent e)
{
Import_Popup.show(Import, Import.getWidth(), 0);
}
});
}// Constructor
public static void main(String[] args)
{
new SubMenu();
}
}
Raises this exception on Press :
component must be showing on the screen to determine its location
Is there a way to keep JMenuItems visible after press?
So I tried to look at the Java docs for help for this but got confused pretty quickly. I am trying to add a submenu to the menu item 'Edit' which will have submenus Copy and Paste, and I'm note sure how to do it. I have a submenu variable created, do I use that? Please help, thank you. Code is below.
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
public class MyJFrame extends JFrame
{
JMenuBar menubar;
JMenu menu, submenu;
JMenuItem mi;
public MyJFrame(String title)
{
super(title);
menubar = new JMenuBar();
setJMenuBar(menubar);
buildMenu();
}
void buildMenu()
{
menu = new JMenu("File");
mi = new JMenuItem("New");
menu.add(mi);
menubar.add(menu);
mi = new JMenuItem("List Files");
menu.add(mi);
menubar.add(menu);
menu.addSeparator();
mi = new JMenuItem("Save As");
menu.add(mi);
menubar.add(menu);
menu.addSeparator();
mi = new JMenuItem("Close");
menu.add(mi);
menubar.add(menu);
menu = new JMenu("Tools");
mi = new JMenuItem("Sort");
menu.add(mi);
menubar.add(menu);
mi = new JMenuItem("Search");
menu.add(mi);
menubar.add(menu);
mi = new JMenuItem("Edit");
menu.add(mi);
menubar.add(menu);
mi = new JMenuItem("Copy");
menu.add(mi);
menubar.add(menu);
mi = new JMenuItem("Paste");
menu.add(mi);
menubar.add(menu);
}
}
create a Menu instead of a MenuItem for Edit, and add MenuItems Copy and Paste. Then Add edit menu to Tools Menu .
menu = new JMenu("Tools");
mi = new JMenuItem("Sort");
menu.add(mi);
mi = new JMenuItem("Search");
menu.add(mi);
JMenu med = new JMenu("Edit");
mi = new JMenuItem("Copy");
med.add(mi);
mi = new JMenuItem("Paste");
med.add(mi);
menu.add(med);
menubar.add(menu);
Note: I have edited the last part of your code. Just replace the code from tools menu to this and try this. If it gets error, tell me.
Here is a simple example of how you can do it:
JMenuBar menuBar = new JMenuBar();
// Edit Menu
JMenu editMenu = new JMenu("Edit");
menuBar.add(editMenu);
// Edit -> Copy
JMenuItem copyMenuItem = new JMenuItem("Copy");
editMenu.add(copyMenuItem);
// Edit -> Paste
JMenuItem pasteMenuItem = new JMenuItem("Paste");
editMenu.add(pasteMenuItem);
Simplified excerpt from https://docs.oracle.com/javase/tutorial/uiswing/components/menu.html
Result image
menu.addSeparator();
submenu = new JMenu("A submenu");
menuItem = new JMenuItem("An item in the submenu");
submenu.add(menuItem);
menuItem = new JMenuItem("Another item");
submenu.add(menuItem);
menu.add(submenu); // you add the submenu to your existing menu
I have the following SwingMenu class.
package base;
import javax.swing.*;
public class SwingMenu {
public static void main(String[] args) {
SwingMenu s = new SwingMenu();
}
public SwingMenu() {
JFrame frame = new JFrame(
"Creating a JMenuBar, JMenu, JMenuItem and seprator Component");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar menubar = new JMenuBar();
JMenu filemenu = new JMenu("File");
filemenu.add(new JSeparator());
JMenu editmenu = new JMenu("Edit");
editmenu.add(new JSeparator());
JMenuItem fileItem1 = new JMenuItem("New");
JMenuItem fileItem2 = new JMenuItem("Open");
JMenuItem fileItem3 = new JMenuItem("Close");
fileItem3.add(new JSeparator());
JMenuItem fileItem4 = new JMenuItem("Save");
JMenuItem editItem1 = new JMenuItem("Cut");
JMenuItem editItem2 = new JMenuItem("Copy");
editItem2.add(new JSeparator());
JMenuItem editItem3 = new JMenuItem("Paste");
JMenuItem editItem4 = new JMenuItem("Insert");
filemenu.add(fileItem1);
filemenu.add(fileItem2);
filemenu.add(fileItem3);
filemenu.add(fileItem4);
editmenu.add(editItem1);
editmenu.add(editItem2);
editmenu.add(editItem3);
editmenu.add(editItem4);
menubar.add(filemenu);
menubar.add(editmenu);
frame.setJMenuBar(menubar);
frame.setSize(400, 400);
frame.setVisible(true);
}
}
And I want to display the Menu by calling it from the this main class.
package base;
import javax.swing.*;
import java.awt.*;
import base.SwingMenu;
public class StickyNotes {
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("Java Sticky Notes");
frame.setPreferredSize(new Dimension(5000, 5000));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout(FlowLayout.LEFT));
// Add Label
JLabel label = new JLabel("Type Below");
frame.getContentPane().add(label);
// Add Main Menu
SwingMenu mainBar = new SwingMenu();
//frame.setJMenuBar(mainBar);
//frame.getContentPane().add(mainBar);
// Display the window.
frame.pack();
frame.setVisible(true);
}
public Container createContentPane() {
// Create the content-pane-to-be.
JPanel jplContentPane = new JPanel(new BorderLayout());
jplContentPane.setLayout(new BorderLayout());
jplContentPane.setOpaque(true);
return jplContentPane;
}
public static void main(String[] args) {
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
I just cannot figure it out all morning :) How do I get the Menu Bar to show up in Java Swing?
// Add Main Menu
SwingMenu mainBar = new SwingMenu();
Check this modified code example :
import javax.swing.*;
import java.awt.*;
public class StickyNotes {
private JMenuBar getMenuBar()
{
JMenuBar menubar = new JMenuBar();
JMenu filemenu = new JMenu("File");
filemenu.add(new JSeparator());
JMenu editmenu = new JMenu("Edit");
editmenu.add(new JSeparator());
JMenuItem fileItem1 = new JMenuItem("New");
JMenuItem fileItem2 = new JMenuItem("Open");
JMenuItem fileItem3 = new JMenuItem("Close");
fileItem3.add(new JSeparator());
JMenuItem fileItem4 = new JMenuItem("Save");
JMenuItem editItem1 = new JMenuItem("Cut");
JMenuItem editItem2 = new JMenuItem("Copy");
editItem2.add(new JSeparator());
JMenuItem editItem3 = new JMenuItem("Paste");
JMenuItem editItem4 = new JMenuItem("Insert");
filemenu.add(fileItem1);
filemenu.add(fileItem2);
filemenu.add(fileItem3);
filemenu.add(fileItem4);
editmenu.add(editItem1);
editmenu.add(editItem2);
editmenu.add(editItem3);
editmenu.add(editItem4);
menubar.add(filemenu);
menubar.add(editmenu);
return menubar;
}
private void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("Java Sticky Notes");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout(FlowLayout.LEFT));
// Add Label
JLabel label = new JLabel("Type Below");
frame.getContentPane().add(label);
// Add Main Menu
frame.setJMenuBar(getMenuBar());
// Display the window.
frame.pack();
frame.setVisible(true);
}
public Container createContentPane() {
// Create the content-pane-to-be.
JPanel jplContentPane = new JPanel(new BorderLayout());
jplContentPane.setLayout(new BorderLayout());
jplContentPane.setOpaque(true);
return jplContentPane;
}
public static void main(String[] args) {
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new StickyNotes().createAndShowGUI();
}
});
}
}
Or you can modify your code a bit like this, if you really wanted to keep the JMenuBar set up in a different Class, where you can simply make an Object of the SwingMenu Class and call the method getMenuBar() by making an Object of this Class :
import javax.swing.*;
import java.awt.*;
public class StickyNotes {
private void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("Java Sticky Notes");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout(FlowLayout.LEFT));
// Add Label
JLabel label = new JLabel("Type Below");
frame.getContentPane().add(label);
// Add Main Menu
SwingMenu swingMenu = new SwingMenu();
frame.setJMenuBar(swingMenu.getMenuBar());
// Display the window.
frame.pack();
frame.setVisible(true);
}
public Container createContentPane() {
// Create the content-pane-to-be.
JPanel jplContentPane = new JPanel(new BorderLayout());
jplContentPane.setLayout(new BorderLayout());
jplContentPane.setOpaque(true);
return jplContentPane;
}
public static void main(String[] args) {
// creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new StickyNotes().createAndShowGUI();
}
});
}
}
class SwingMenu {
public JMenuBar getMenuBar()
{
JMenuBar menubar = new JMenuBar();
JMenu filemenu = new JMenu("File");
filemenu.add(new JSeparator());
JMenu editmenu = new JMenu("Edit");
editmenu.add(new JSeparator());
JMenuItem fileItem1 = new JMenuItem("New");
JMenuItem fileItem2 = new JMenuItem("Open");
JMenuItem fileItem3 = new JMenuItem("Close");
fileItem3.add(new JSeparator());
JMenuItem fileItem4 = new JMenuItem("Save");
JMenuItem editItem1 = new JMenuItem("Cut");
JMenuItem editItem2 = new JMenuItem("Copy");
editItem2.add(new JSeparator());
JMenuItem editItem3 = new JMenuItem("Paste");
JMenuItem editItem4 = new JMenuItem("Insert");
filemenu.add(fileItem1);
filemenu.add(fileItem2);
filemenu.add(fileItem3);
filemenu.add(fileItem4);
editmenu.add(editItem1);
editmenu.add(editItem2);
editmenu.add(editItem3);
editmenu.add(editItem4);
menubar.add(filemenu);
menubar.add(editmenu);
return menubar;
}
}
You are creating 2 different JFrames. After creating the JFrame:
JFrame frame = new JFrame("Java Sticky Notes");
Create the menu bar and assign it to the JFrame:
JMenuBar menubar = new JMenuBar();
// ...
frame.setJMenuBar(menubar);
No need for:
SwingMenu mainBar = new SwingMenu();
Try this out:
This basically makes SwingMenu a manu bar which will help encapsulating the build of the menu bar.
public class SwingMenu extends JMenuBar{
public SwingMenu() {
JMenu filemenu = new JMenu("File");
JMenu editmenu = new JMenu("Edit");
// Build your file menu and edit menu here...
add(filemenu);
add(editmenu);
}
}
Now, in your createAndShowGUI() just create a form and add the newly created menu bar to it.
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("Java Sticky Notes");
// other stuff...
// Add Main Menu
SwingMenu mainBar = new SwingMenu();
frame.setJMenuBar(mainBar);
// Display the window.
frame.pack();
frame.setVisible(true);
}
I had a simple drawing application. I need to add a menu and a toolbar on the left side.
So now, instead of using a simple JFrame, I'm creating a simple class that extends JFrame. I was able to add the menu following some examples online, but can't figure out how to add a JToolBar. I've tried a few different ways, but nothing works. I don't get an error, everything complies just fine, but I don't see any JToolBar.
Here's the code for my JFrame, I hope you can help.
class Menu extends JFrame {
private JMenuItem openItem;
private JMenuItem saveItem;
private JMenuItem saveAsItem;
public Menu(String title) {
openItem = new JMenuItem("Open...");
openItem.setMnemonic('O');
openItem.setAccelerator(KeyStroke.getKeyStroke("control O"));
saveItem = new JMenuItem("Save");
saveItem.setMnemonic('S');
saveItem.setAccelerator(KeyStroke.getKeyStroke("control S"));
saveAsItem = new JMenuItem("Save As...");
saveAsItem.setMnemonic('S');
saveAsItem.setAccelerator(KeyStroke.getKeyStroke("control S"));
// (2) Build menubar, menus, and add menuitems.
JMenuBar menubar = new JMenuBar();
JMenu fileMenu = new JMenu("File");
fileMenu.setMnemonic('F');
menubar.add(fileMenu);
fileMenu.add(openItem);
fileMenu.addSeparator();
fileMenu.add(saveItem);
// (3) Add listeners to menu items
openItem.addActionListener(new OpenAction()); // TODO change
setJMenuBar(menubar);
JToolBar toolbar = new JToolBar("Toolbar", JToolBar.VERTICAL);//);
// JPanel panel = new JPanel();
// panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
JButton newb = new JButton("new");
toolbar.add(newb);
// toolbar.setOpaque(true);
toolbar.setLocation(100, 100);
toolbar.setVisible(true);
// toolbar.setMinimumSize(new Dimension(100, 100));
// toolbar.setAlignmentX(0);
// panel.add(toolbar);
add(toolbar, BorderLayout.NORTH);
getContentPane().add(toolbar, BorderLayout.NORTH);
// getRootPane().setWindowDecorationStyle(JRootPane.PLAIN_DIALOG);
setTitle(title);
pack();
setLocationRelativeTo(null); // Center window.
}
// OpenAction
class OpenAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(Menu.this, "Can't Open.");
}
}
}
its work fine, and you don't need to setVisible tool bar because its showing by default, also don't add the tool bar two time in the same place (NORTH)
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class MenuDemo {
public static void main(String... args) {
EventQueue.invokeLater(
new Runnable() {
#Override
public void run() {
JFrame menu = new Menu("Testing");
menu.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
menu.setVisible(true);
}
}
);
}
}
class Menu extends JFrame {
private JMenuItem openItem;
private JMenuItem saveItem;
private JMenuItem saveAsItem;
public Menu(String title) {
openItem = new JMenuItem("Open...");
openItem.setMnemonic('O');
openItem.setAccelerator(KeyStroke.getKeyStroke("control O"));
saveItem = new JMenuItem("Save");
saveItem.setMnemonic('S');
saveItem.setAccelerator(KeyStroke.getKeyStroke("control S"));
saveAsItem = new JMenuItem("Save As...");
saveAsItem.setMnemonic('S');
saveAsItem.setAccelerator(KeyStroke.getKeyStroke("control S"));
// (2) Build menubar, menus, and add menuitems.
JMenuBar menubar = new JMenuBar();
JMenu fileMenu = new JMenu("File");
fileMenu.setMnemonic('F');
menubar.add(fileMenu);
fileMenu.add(openItem);
fileMenu.addSeparator();
fileMenu.add(saveItem);
// (3) Add listeners to menu items
openItem.addActionListener(new OpenAction()); // TODO change
setJMenuBar(menubar);
JToolBar toolbar = new JToolBar("Toolbar", JToolBar.VERTICAL);//);
JButton newb = new JButton("new");
toolbar.add(newb);
add(toolbar, BorderLayout.NORTH);
setTitle(title);
setLocationRelativeTo(null);
pack();
}
// OpenAction
private class OpenAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(Menu.this, "Can't Open.");
}
}
}
My problem was that I was the way I was instantiating my JFrame. I was using a helper function like this one:
public static JFrame openInJFrame(Container content, int width, int height,
String title, Color bgColor) {
// ...
frame.setContentPane(content);
frame.setVisible(true);
return (frame);
}
So my JToolBar was getting replaced by the Container object...
Thanks guys! Your answers helped me figure out my problem.
I'm having problems with my code. The sub-menu for the (Music) menu should be a radio button type.
Here's my first code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class AMBAT_FLAB1 extends JApplet implements ActionListener{
JMenuBar mainBar = new JMenuBar();
JMenu menu1 = new JMenu("File");
JMenu menu2 = new JMenu("Format");
JMenu menu3 = new JMenu("Background");
//for file
JMenuItem open = new JMenuItem("Open");
JMenuItem save = new JMenuItem("Save");
JMenuItem reset = new JMenuItem("Reset");
//for format
JMenuItem setFont = new JMenuItem("Set Font");
JMenuItem setColor = new JMenuItem("Set Color");
//for background
JMenuItem image = new JMenuItem("Images");
JMenuItem music = new JMenuItem("Music");
//submenu of music
JRadioButtonMenuItem play = new JRadioButtonMenuItem("Play");
JRadioButtonMenuItem loop = new JRadioButtonMenuItem("Loop");
JRadioButtonMenuItem stop = new JRadioButtonMenuItem("Stop");
ButtonGroup group = new ButtonGroup();
//file chooser
//JFileChooser fileChooser = new JFileChooser();
//fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
//text area
JTextArea myArea = new JTextArea(50, 50);
JScrollPane scrollingArea = new JScrollPane(myArea);
Container con = getContentPane();
public void init(){
setJMenuBar(mainBar);
mainBar.add(menu1);
mainBar.add(menu2);
mainBar.add(menu3);
menu1.add(open);
menu1.add(save);
menu1.add(reset);
menu2.add(setFont);
menu2.add(setColor);
menu3.add(image);
menu3.add(music);
music.group.add(play);
//group.add(loop);
//music.add(stop);
open.addActionListener(this);
save.addActionListener(this);
reset.addActionListener(this);
setFont.addActionListener(this);
setColor.addActionListener(this);
image.addActionListener(this);
music.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
}
}
When I try to run it, the Music menu doesn't appear. It changes to the Play (radio button). Does the button group help? When i tried to use the button group nothing happens.
Like this?
/* <applet code='AMBAT_FLAB1' width=220 height=100></applet> */
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class AMBAT_FLAB1 extends JApplet implements ActionListener{
JMenuBar mainBar = new JMenuBar();
JMenu menu1 = new JMenu("File");
JMenu menu2 = new JMenu("Format");
JMenu menu3 = new JMenu("Background");
//for file
JMenuItem open = new JMenuItem("Open");
JMenuItem save = new JMenuItem("Save");
JMenuItem reset = new JMenuItem("Reset");
//for format
JMenuItem setFont = new JMenuItem("Set Font");
JMenuItem setColor = new JMenuItem("Set Color");
//for background
JMenuItem image = new JMenuItem("Images");
JMenu music = new JMenu("Music");
//submenu of music
JRadioButtonMenuItem play = new JRadioButtonMenuItem("Play");
JRadioButtonMenuItem loop = new JRadioButtonMenuItem("Loop");
JRadioButtonMenuItem stop = new JRadioButtonMenuItem("Stop");
ButtonGroup group = new ButtonGroup();
//file chooser
//JFileChooser fileChooser = new JFileChooser();
//fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
//text area
JTextArea myArea = new JTextArea(50, 50);
JScrollPane scrollingArea = new JScrollPane(myArea);
Container con = getContentPane();
public void init(){
setJMenuBar(mainBar);
mainBar.add(menu1);
mainBar.add(menu2);
mainBar.add(menu3);
menu1.add(open);
menu1.add(save);
menu1.add(reset);
menu2.add(setFont);
menu2.add(setColor);
menu3.add(image);
menu3.add(music);
group.add(play);
group.add(loop);
group.add(stop);
music.add(play);
music.add(loop);
music.add(stop);
//music.add(stop);
open.addActionListener(this);
save.addActionListener(this);
reset.addActionListener(this);
setFont.addActionListener(this);
setColor.addActionListener(this);
image.addActionListener(this);
music.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
}
}
The mistakes in the code were basically:
If Music had children, it had to be a JMenu, not a JMenuItem
A ButtonGroup is a logical group (e.g. to make radio buttons out of a group of buttons), it is not a container. So besides adding the buttons to the group, it is necessary to add them to the Music JMenu.
You have a syntax error in your source code. Try commenting out the line that is failing and recompiling. That should give you a bit more information in your interface (GUI).