Problems with tables of Menus and Menu items

The short story's I am a graphic interface for application design, it has a lot of menus and menu by menu items.
I thought as in normal Java, I could simply do an array of Menus and many of the menu items. My problem is that it compiles fine, but spreading tons of exceptions. I use Netbeans as my IDE.

Here is a sample of my code. Is not all that, but that's the part I have printing has problems since he worked before moving to tabular form.




[Menus] Menu = Menu new [11];
menus [0]. SetText ("file");
File [] = new MenuItem MenuItem [8]; DEFINITIONS FROM FILE MENU


file [2]. SetText ("Open"); Open
file [2] .setOnAction (new EventHandler < ActionEvent > () {}
@Override
{} public void handle (ActionEvent arg0)

Element 'FileChooser' fc = new FileChooser();

File = fc.showOpenDialog (primaryStage);

}
});

leader [2] .setAccelerator (null);



menus [0]. GetItems(). AddAll (file);

Menu bar bar of menus = MenuBarBuilder.create)

. Build();




menubar.getMenus () .addAll (menus);


VBox vbox1 = VBoxBuilder.create)
. Children (MenuBar, scrollPane1, BTN)
. Build();


ap.getChildren () .addAll (vbox1);


in any case the stuff compiles fine without error. But Netbeans spit exceptions as a guy who ate a bottle of ipecac and the bombs of programs.
Here are some of them.

Exception in the method of Application startup
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.javafx.main.Main.launchApp(Main.java:642)
at com.javafx.main.Main.main(Main.java:805)
Caused by: java.lang.RuntimeException: Exception start Application, method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:403)
to com.sun.javafx.application.LauncherImpl.access$ 000 (LauncherImpl.java:47)
to com.sun.javafx.application.LauncherImpl$ 1.run(LauncherImpl.java:115)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.NullPointerException
to javafxapplication2. JavaFXApplication2.start (JavaFXApplication2.java:37)
to com.sun.javafx.application.LauncherImpl$ 5.run(LauncherImpl.java:319)
to com.sun.javafx.application.PlatformImpl$ 5.run(PlatformImpl.java:206)
to com.sun.javafx.application.PlatformImpl$ 4.run(PlatformImpl.java:173)
at com.sun.glass.ui.win.WinApplication._runLoop (Native Method)
in com.sun.glass.ui.win.WinApplication.access$ 100 (WinApplication.java:29)
to com.sun.glass.ui.win.WinApplication$ $3 1.run(WinApplication.java:73)
... 1 more
Result of Java: 1

I don't really know what to do. I would like some recommendations.
If possible I would still use arrays of Menus and Menu items, but if this is not possible, I would like to know and understand why not.

(Sorry, that swapped with your previous message).

You have a NullPointerException because you try to reference menus [0] when it has not been initialized:

Menu[] menus = new Menu[11] ;

creates a reference to an array of 11 Menus, but not initialize them. So, each element of the array is null.

menus[0].setText("File");

throws a NullPointerException you are trying to call a method via an object reference (menus [0]) that is set to null.

You need

Menu[] menus = new Menu[11];
menus[0]=new Menu();
menus[0].setText("File");
// or just replace those two lines with menus[0]=new Menu("File");

and similarly, no doubt, for all other elements in the menus array.

You have problems similar to sets of menu items.

Edited by: James_D October 31, 2012 12:00

Tags: Java

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