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  1. #1
    skaterboy987 is offline Member
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    Sep 2011
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    Default Read a specific line or a .txt

    I know how to read all lines:
    class ReadFile
    public static void main(String args[])
    FileInputStream fstream = new FileInputStream("C:\\Users\\Willy\\Desktop\\Auto Generated\\Test.txt");
    DataInputStream in = new DataInputStream(fstream);
    BufferedReader br = new BufferedReader(new InputStreamReader(in));
    String strLine;
    while ((strLine = br.readLine()) != null) {
    System.out.println (strLine);
    }catch (Exception e){//Catch exception if any
    } [CODE]

    But how could I read...a specific line
    Like line 3;
    or line 1;

  2. #2
    DiamondSoul is offline Member
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    Oct 2011
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    Default Re: Read a specific line or a .txt

    You have to just read up to that line (i.e. read all the lines before it). I'm 99% sure there is a way to "seek" to a specific offset in a file (though I don't know what that way is off the top of my head; I'd have to look it up), but that would only work to read a specific line if you knew the exact length of all the lines that preceded it.

  3. #3
    Junky's Avatar
    Junky is offline Grand Poobah
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    Jan 2011
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    Default Re: Read a specific line or a .txt

    It depends upon the situation.

    If you simply want to read a specific line N once and nothing else then read n - 1 lines (throw them away) then read and keep the next line.

    If you want to read multiple lines in random order then it would be better if you read the entire file into a List then you can access any line you want by using the line number as an index into the List.

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