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javafilenumberslinelocate

Is there any method to locate a line with line num in a text file with java api?

I hope there do have an operation for this topic,'cause I don't want to loop the file once again,and hope to read the file from the specific location say a line number,and then I will read the file with much more threads than just one.

Any idea? Thanks first!!

Solution

  • To my knowledge there isn't anything like this in the standard Java API. You could use LineIterator or (even just a basic BufferedReader) to build a custom class that does what you need, like this guy did.

    Note that a RandomAccessFile sounds promising but unfortunately for you, the seek() method takes an offset in bytes and not in lines so unless your lines are all always the same length, this wont' work for you.