使用JMenuBar創建JFrame時出現問題。 我有一個MenuBarBuilder類在這裏:JFrame上的JMenuBar中的空JMenuItems
public class MenuBuilder extends JMenuBar
{
private Model model;
public MenuBuilder(Model model)
{
this.model = model;
buildMenuBar();
}
public void buildMenuBar()
{
JMenu menuFile = new JMenu("File");
JMenu menuEdit = new JMenu("Edit");
JMenu menuHelp = new JMenu("Help");
menuHelp.setMnemonic('H');
menuFile.setMnemonic('F');
menuEdit.setMnemonic('E');
JMenuItem menuItemExit = new JMenuItem("Exit");
menuItemExit.setAccelerator(model.getKeyStroke(KeyEvent.VK_ESCAPE, 0));
menuItemExit.setAction(new ActionExit(model));
menuFile.add(menuItemExit);
add(menuFile);
add(menuEdit);
add(menuHelp);
}
}
而且JFrame的是在另一個類中創建:
public MainGUI(boolean loadConfig, String loadConfigDir, Model model)
{
try
{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e)
{
GlobalVariables.LOGGING_logger.error("Something went wrong while getting the Look and Feel of current Windows Version for Userinterface", e);
}
try
{
this.model = model;
frameMain = new JFrame("MainFrame");
frameMain.setJMenuBar(new MenuBuilder(model));
frameMain.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frameMain.addWindowListener(this);
frameMain.setMinimumSize(new Dimension(500, 500));
frameMain.pack();
frameMain.setSize(800, 800);
frameMain.setLocationRelativeTo(null);
frameMain.setVisible(true);
}
catch (Exception e)
{
GlobalVariables.LOGGING_logger.error("Error while seeting up the main GUI.", e);
MessagesToUser.errorMessageBothFilesIssue(true);
}
}
顯示JFrame
後,所有的MenuItems是空的,但現有的和函數(ActionExit
)是也工作正確。使用以下代碼menuFile.add(new JMenuItem("Exit"));
設置新的JMenuItem
按預期工作,並且JFrame具有正確的JMenuBar
。這是爲什麼發生?
編輯: 這裏是ActionExit類只退出程序:
public class ActionExit extends AbstractAction
{
private Model model;
public ActionExit(Model model)
{
this.model = model;
}
@Override
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
}
你實際上沒有添加任何東西到菜單(其他然後退出)? – MadProgrammer 2013-05-08 07:51:40
這只是一個例子。所有菜單都有三個以上的條目。 – 2013-05-08 07:53:16
那麼,你如何填充菜單呢? – MadProgrammer 2013-05-08 07:54:29