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Thread: core java begineer

  1. #1
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    Default core java begineer

    Hi

    I'm new to java and this blog as well. I started learning core java
    and oops concepts. Right now, i'm working on jxl which deals with
    creation of excel and more on..

    When i see the code to create the workbook it was written as

    WritableWorkbook workbook = Workbook.createWorkbook(file, wbSettings);

    I'm not clear with above snippet and how it is creating the book. I
    browsed the java doc and noticed that Workbook and WritableWorbook are
    Abstract class.

    Also, when i see .class of both.


    /* */ public static WritableWorkbook createWorkbook(java.io.File
    file)
    /* */ throws IOException
    /* */ {
    /* 286 */ return createWorkbook(file, new WorkbookSettings());
    /* */ }

    Please explain why we have WritableWorkbook in method of Workbook and
    what it returns and flow of the alogritham

    Thanks


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: core java begineer

    You need to read up on method definitions and static methods.
    Try this site:
    Trail: Learning the Java Language: Table of Contents (The Java™ Tutorials)

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    Default Re: core java begineer

    Hi,
    You can try to use jxls tag to create excel file , I think that will be more easy.

    Core java
    Last edited by mr.miku; January 11th, 2012 at 07:19 PM.

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    Default Re: core java begineer

    Both WorkBook and WritableWorkbook classes are extended by Object (the Parent/Root of all classes).
    WorkBook contains a method createWorkBook() which accepts a File type parameter and returns a WritableWorkBook after processing. createWorkBook() is only defined in WorkBook method and as it returns WritableWorkBook so
    WritableWorkBook obj = WorkBook.createWorkBook(File fileObj);
    This will pass fileObj to createWorkBook of WorkBook and get a WritableWorkBook object which will be assigned to WritableWorkBook object.
    I hope it seems clear now.

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