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Asked: 2026-05-11T05:48:34+00:00

I’m trying to make a GUI in java, but JMenuBar has been giving me

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I’m trying to make a GUI in java, but JMenuBar has been giving me a hard time for two days. Can someone please tell me why it isn’t showing up?

import java.awt.*; import javax.swing.*; import javax.swing.JPanel; import java.awt.event.*; import java.awt.image.*;      import java.io.*; import java.util.Arrays; import javax.imageio.ImageIO;  public class selectionFrame extends JFrame  {   Font name;   Font title;    public void setup() //can't use constructer because this isn't given a size until after it is constructed.   {     //getContentPane().add(menuBar);    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    getContentPane().setLayout(new FlowLayout());    //getContentPane().add(j);     setJMenuBar(createMenuBar());    //getContentPane().add(createMenuBar());     }    public JMenuBar createMenuBar()   {    JMenuBar menuBar;    JMenu m_file;    JMenuItem mi_save;    JMenuItem mi_load;     JMenu m_edit;    JMenuItem mi_tileHeight;    JMenuItem mi_tileWidth;     menuBar = new JMenuBar();    m_file = new JMenu('File');    m_edit = new JMenu('Edit');     mi_save = new JMenuItem('Save file', KeyEvent.VK_S);    mi_load = new JMenuItem('Load file', KeyEvent.VK_L);    mi_tileHeight = new JMenuItem('Set tile height', KeyEvent.VK_H);    mi_tileWidth = new JMenuItem('Set tile width', KeyEvent.VK_W);     menuBar.add(m_file);    m_file.add(mi_save);    m_file.add(mi_load);     menuBar.add(m_edit);    m_edit.add(mi_tileHeight);    m_edit.add(mi_tileWidth);     return menuBar;   }    public static void main(String[] args) //run   {     selectionFrame sel = new selectionFrame();    sel.setLocationRelativeTo(null);    sel.setSize((int) 400 + (sel.getInsets().left + sel.getInsets().right),(int) 400  + (sel.getInsets().top + sel.getInsets().bottom));     sel.setVisible(true);    sel.setTitle('Tiles/Meta');    sel.setResizable(false);    sel.setFocusable(true);    sel.getContentPane().setSize(sel.getSize());    sel.setLocation((int) sel.getX() - (sel.getWidth()/2),(int) sel.getY() -  (sel.getHeight()/2));    sel.setup();    sel.repaint();     }   }
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1 Answer

  1. You have an awful lot of extra code there.

    public class SelectionFrame extends JFrame {     Font name;     Font title;      public SelectionFrame()     {         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         setJMenuBar(createMenuBar());     }      public JMenuBar createMenuBar()     {         JMenuBar menuBar;         JMenu m_file;         JMenuItem mi_save;         JMenuItem mi_load;          JMenu m_edit;         JMenuItem mi_tileHeight;         JMenuItem mi_tileWidth;          menuBar = new JMenuBar();         m_file = new JMenu('File');         m_edit = new JMenu('Edit');          mi_save = new JMenuItem('Save file', KeyEvent.VK_S);         mi_load = new JMenuItem('Load file', KeyEvent.VK_L);         mi_tileHeight = new JMenuItem('Set tile height',         KeyEvent.VK_H);         mi_tileWidth = new JMenuItem('Set tile width',         KeyEvent.VK_W);          menuBar.add(m_file);         m_file.add(mi_save);         m_file.add(mi_load);          menuBar.add(m_edit);         m_edit.add(mi_tileHeight);         m_edit.add(mi_tileWidth);          return menuBar;     }      public void main( String args[] )     {          SelectionFrame sel = new SelectionFrame();         sel.setLocationRelativeTo(null);         sel.setSize(400 + (sel.getInsets().left + > sel.getInsets().right), 400         + (sel.getInsets().top + sel.getInsets().bottom));          sel.setTitle('Tiles/Meta');         sel.setResizable(false);         sel.setFocusable(true);          sel.getContentPane().add( new JLabel( 'Content', SwingConstants.CENTER),          BorderLayout.CENTER );         sel.setLocation(sel.getX() - (sel.getWidth() / 2), sel.getY() - >             (sel.getHeight() / 2));         sel.setVisible(true);      } }

    That shows up with a menu bar and everything. if you add your content to the CENTER of the content pane (by default a border layout), the center automatically fills the whole content area, you don’t have to resize anything.

    This shows up as a window with a menu bar and everything works fine.

    What platform are you doing this on? I’m on Vista, i get what i expect to see.

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