When I run the program, I see a blank window.
How am I able to solve this? Thanks you. What I did wrong?
Here is my code:
public class Environment{
private JFrame frame;
private JMenu jmenu;
private JMenuItem menuItem;
private JMenuBar menuBar;
Environment(){
frame = new JFrame("Notepad");
menuBar = new JMenuBar();
//menuBar.setVisible(true);
jmenu = new JMenu("Test");
menuItem = new JMenuItem("Open");
jmenu.add(menuItem);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new FlowLayout());
frame.setSize(660, 350);
// Set a main menu
frame.setJMenuBar(menuBar);
menuBar.add(jmenu);
frame.setVisible(true);
}
}
Adding label1 and button1 - You can fix layout etc. Suggest you to use Jpanel as well.
public class Enviornment {
/**
* #param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
JFrame frame;
JMenu jmenu;
JMenuItem menuItem;
JMenuBar menuBar;
frame = new JFrame("Notepad");
menuBar = new JMenuBar();
menuBar.setVisible(true);
jmenu = new JMenu("Test");
menuItem = new JMenuItem("Open");
jmenu.add(menuItem);
JLabel label1 = new JLabel("My Name");
JButton button1 = new JButton("Button");
frame.add(label1);
frame.add(button1);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(new FlowLayout());
frame.setSize(660, 350);
// Set a main menu
frame.setJMenuBar(menuBar);
menuBar.add(jmenu);
frame.setVisible(true);
}
}
Related
I need to create a JMenuBar that will be shown under of JTabbedPane named as shapes. When I changed tab, menu bar will not be shown in the other tab. You can see what I mean from images.
I created a menu bar and add it to JFrame but that is not I mean. If you did not understand a point let me explain.
public class Gui extends JPanel {
JFrame frame;
JTabbedPane tabbedPane;
JMenuBar menuBar;
JMenu createShapes, display, help;
JMenuItem RandomShapes, Rectangle, Circle, Square;
public void createFrame() {
frame = new JFrame();
frame.setSize(1000, 600);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.setVisible(true);
frame.setFocusable(false);
setVisible(true);
setSize(1000, 600);
}
public void createMenus() {
menuBar = new JMenuBar();
//frame.setJMenuBar(menuBar);
createShapes = new JMenu("CreateShapes");
menuBar.add(createShapes);
display = new JMenu("Display");
menuBar.add(display);
help = new JMenu("Help");
menuBar.add(help);
RandomShapes = new JMenuItem("Random Shapes");
createShapes.add(RandomShapes);
Rectangle = new JMenuItem("Rectangle");
createShapes.add(Rectangle);
Circle = new JMenuItem("Circle");
createShapes.add(Circle);
Square = new JMenuItem("Square");
createShapes.add(Square);
}
public Gui() {
createFrame();
createMenus();
frame.add(this);
//===frames part
tabbedPane = new JTabbedPane();
frame.getContentPane().add(tabbedPane);
JPanel gui2 = new JPanel();
tabbedPane.addTab("Shapes", this);
tabbedPane.addTab("Images", gui2);
//===endframespart
}
}
The other tab image
Shapes tab image
Actually, you cannot set menu bar to JTabbedPane.
You need to add JInternalFrame inside one of the tabs of JTabbedPane, then
you can call setJMenuBar of JInternalFrame.
Here is a simple example:
JInternalFrame jInternalFrame = new JInternalFrame();
jMenuBar = new javax.swing.JMenuBar();
jMenu1 = new JMenu("Save");
jMenu2 = new JMenu("Open");
jMenuBar.add(jMenu1);
jMenuBar.add(jMenu2);
jInternalFrame.setJMenuBar(jMenuBar);
tabbedPane.addTab("tab3", jInternalFrame);
I have a menu bar in a JFrame JF when i click on the menubar item a new JFrame JF1 is created and is displayed , but when i clicked on the close button of JF1 , both JFrame are closed . When i click on close button of JF1 , i want only JF1 to be closed , not JF
JMenuBar menubar;
JMenu help;
JMenuItem about;
public GUI() {
setLayout(new FlowLayout());
menubar = new JMenuBar();
add(menubar);
help = new JMenu("Help");
menubar.add(help);
}`
a new JFrame JF1 is created and is displayed
Don't create a new JFrame an application should only have a single JFrame.
Instead create a JDialog. See: The Use of Multiple JFrames: Good or Bad Practice? for more information.
Also you don't add a JMenuBar to a JFrame using the add(...) method. See How to Use Menu Bars for the better way to do that.
I recomend you to use DesktopPane and JInternalFrame.
To the main Frame you make a change: contentPane (JPanel) will be JDesktopPane.
The JFrame that it's displayed whit the click will be a JInternalFrame.
In the actionListener of the JMenuItem, you will do this:
MyInternalFrame internalFrame = new MyInternalFrame();
internalFrame.show();
contentPane.add(internalFrame);
MyInternalFrame is the class of the Frame displayed (a class that extends JInternalFrame).
To close "internalFrame", just add a button to the layout whit the text "Quit" and in the actionListener of its you put "dispose()".
Try it and tell if it works ;)
--EDIT---
MAIN CLASS (The JFRAME)
public class Main extends JFrame {
private JDesktopPane contentPane;
private JMenuBar menuBar;
private JMenu mnExample;
private JMenuItem mntmAbout;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Main frame = new Main();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Main() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(20, 20, 800, 800);
menuBar = new JMenuBar();
setJMenuBar(menuBar);
mnExample = new JMenu("Help");
menuBar.add(mnExample);
mntmAbout = new JMenuItem("About");
mntmAbout.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
About frame = new About();
frame.show();
contentPane.add(frame);
}
});
mnExample.add(mntmAbout);
contentPane = new JDesktopPane();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
}
}
ABOUT CLASS (The JINTERNALFRAME)
public class About extends JInternalFrame {
public About() {
setBounds(100, 100, 544, 372);
JLabel lblSomeText = new JLabel("Some Text");
getContentPane().add(lblSomeText, BorderLayout.CENTER);
JButton btnClose = new JButton("Close");
btnClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
dispose();
}
});
getContentPane().add(btnClose, BorderLayout.SOUTH);
}
}
anyone can tell why the class OpenMenuListener doesnt send a feedback when i click the open button in my Gui ? The erase button works though. It sends me a feedback. I'm exausted.
import java.awt.*;
import javax.swing.*;
public class DrawingApplication extends JFrame {
JComponent drawingArea;
class EraseButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.out.println("Clicked erase");
}
}
class OpenMenuListener implements ActionListener{
public void actionPerformed(ActionEvent e) {
System.out.println("Clicked open");
}
}
public DrawingApplication() {
JPanel frame = new JPanel();
add(frame);
// panel1.add( new JButton(Figuur),BorderLayout.CENTER);
drawingArea = new JLabel();
// label1.add(drawingArea);
frame.add(drawingArea);
// Creates a menubar for a JFrame
JMenuBar menuBar = new JMenuBar();
// Add the menubar to the frame
setJMenuBar(menuBar);
JMenu fileMenu = new JMenu("File");
menuBar.add(fileMenu);
JMenu open = new JMenu("Open");
fileMenu.add(open);
fileMenu.addSeparator();
JMenu save = new JMenu("Save");
fileMenu.add(save);
fileMenu.addSeparator();
JMenu close =new JMenu("Close");
fileMenu.add(close);
JMenu helpMenu = new JMenu("Help");
menuBar.add(helpMenu);
helpMenu.add(new JMenu("Info"));
JPanel panel2 = new JPanel();
add(BorderLayout.SOUTH, frame);
frame.add(new JLabel("figuurkeuze"));
frame.add(panel2);
setVisible(true);
JRadioButton rectButton = new JRadioButton("Rectangle");
JRadioButton triangleButton = new JRadioButton("Triangle");
JRadioButton circleButton = new JRadioButton("Circle");
frame.add(rectButton);
frame.add(triangleButton);
frame.add(circleButton);
JButton erase = new JButton("Erase");
frame.add(erase);
EraseButtonListener eraselistener = new EraseButtonListener();
erase.addActionListener(eraselistener);
OpenMenuListener openMenuListener = new OpenMenuListener();
open.addActionListener(openMenuListener);
}
public static void main(String[] args) {
DrawingApplication frame = new DrawingApplication();
frame.setTitle("My prgram");
frame.setSize(400, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
}
}
It seems a problem of name aliasing, you add the listener to the open variable which is declared as a JMenuItem, so you are adding the ActionListener to the menu item instead that to a button (that you never declare since there is no JButton open = new JButton("open") anywhere).
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.