CODEWITHSUNDEEP
javanetbeansjframeextendsjapplet
Molly Taylor
Molly Taylor

Reputation: 88

Extending JFrame Creates New JFrame Object

I've been creating a fairly complex applet using JFrames extending other JFrames on NetBeans and I'm having issues with accessing data from previous JFrame screens. Looking at the diagram below:

  1. My applet opens with a main screen (MainScreen) with a button for accessing a new page for editing .xls pages (EditScore). This page extends a kind of skeleton JFrame (MenuSkeleton) which is a general form for EditScore and other pages (call them Edit1 and Edit2) which can be accessed through MainScreen. I use MenuSkeleton because both of these pages are only slightly different from each other.

  2. MenuSkeleton opens a file chooser in EditScore which allows users to choose a .xls page to edit and saves this page's name in the integer xlsName (saved in MenuSkeleton). So xlsName is initialized as an empty String in MenuSkeleton but given a new value in EditScore.

  3. EditScore has a button which opens the .xls editor (EditingWindow). EditingWindow extends WindowSkeleton which extends MenuSkeleton because:

    -I need to access xlsName in WindowSkeleton

    -WindowSkeleton can't extend EditScore because sometimes it is called through Edit1 and Edit2 and doesn't even open EditScore.

My problem is with accessing xlsName. I can access xlsName just fine in MenuSkeleton and in EditScore, but once I try to access it in WindowSkeleton or EditingWindow, it's null. I'm guessing this means a new instance of MenuSkeleton is being created when I extend it in WindowSkeleton. Is there a way for me to access the value xlsName is given in editFolder?

Thanks for reading through this ridiculous question! I'm sorry it's so long and confusing - I'll add/modify based on any suggestions I receive.

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Upvotes: 0

Views: 58

Answers (1)

golyadkin
golyadkin

Reputation: 84

As far as I understand EditingWindow and EditScore both extend MenuSkeleton. But EditingWindow also extends WindowSkeleton. Try bypassing WindowSkeleton and extend EditingWindow directly from MenuSkeleton. Extending from two classes one of which is already a subclass causes problems. Hope this helps.

Upvotes: 1

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