Question

I have a bit of code like this:

FileReader fr = new FileReader(file);
BufferedReader reader = new BufferedReader(fr);
for (int i=0;i<100;i++) 
{
   String line = reader.readLine(); 
   ...
}

// at this point I would like to know where I am in the file.
// let's assign that value to 'position' 
// then I would be able to continue reading the next 100 lies (this could be done later on ofcourse... )
// by simply doing this: 

FileReader fr = new FileReader(file);
fr.skip(position); 
BufferedReader reader = new BufferedReader(fr);
for (int i=0;i<100;i++) 
{
   String line = reader.readLine(); 
   ...
}

I can’t figure out how to get/compute the value for ‘position’.

Two things:
I don’t have obviously a fixed length file (i.e.: every line has a different length)
I need to make it work on any system (linux, unix, windows) so I am not sure if I can assume the length of newline (whether it’s one or two chars)

Any help very much appreciated.

Thanks,

Answer 1

If you can keep the file opened, you can try with mark() and reset(). If you have to close the file and reopen, try FileInputStream.getChannel().position() and FileInputStream.skip()