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Thread: Filtering help

  1. #1
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    Default Filtering help

    Hi all!

    Im a really beginner in java.

    I whant to make a java console application with this attributions:
    I have one input and one output file.
    I whant the output file to contains only once the line group what the input file contains repeatedly.
    So for example:

    Anna is tiwce in this file in input. I whant to output file contains the Anna once with BEGIN:VCARD to END:VCARD

    Input file contains this lines:

    BEGIN:VCARD
    VERSION:3.0
    N:;András Pestkó;;;
    FN:András Pestkó
    TEL;TYPE=CELL:+363044000000
    END:VCARD
    BEGIN:VCARD
    VERSION:3.0
    N:füred;Anita;;;
    FN:Anita füred
    TEL;TYPE=VOICE:+36203100000
    END:VCARD
    BEGIN:VCARD
    VERSION:3.0
    N:;Anita füred;;;
    FN:Anita füred
    TEL;TYPE=CELL:+36203100000
    END:VCARD
    BEGIN:VCARD
    VERSION:3.0
    N:;Anna;;;
    FN:Anna
    TEL;TYPE=VOICE:+36204800000
    END:VCARD
    BEGIN:VCARD
    VERSION:3.0
    N:;Anna;;;
    FN:Anna
    TEL;TYPE=CELL:+36204800000
    END:VCARD
    BEGIN:VCARD
    VERSION:3.0
    N:;Anna;;;
    FN:Anna
    TEL;TYPE=CELL:+36204800000
    END:VCARD
    BEGIN:VCARD
    VERSION:3.0

    Thanks for helping me.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Filtering help

    Is the data small enough that it will all fit in memory?
    Read data, save data for each "ID", discard any duplicates, write out new file from saved data.
    If you don't understand my answer, don't ignore it, ask a question.

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