Using BufferedReader

Question

Hello, I have an app which has a class which I pass the System.in to and basically passes it to a BufferedReader:
// System.in is automatically opened when your program starts.
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String line = null;
while ((line = br.readLine()) != null) {
// do something with variable "line" here
br.close();
I call this class whenever I need the next line - which I do some formatting to and return the results.
The only issue I noticed is a good portion of my execution time is spent pulling up the next line coming in - and since very large amount of text may be getting piped over to the app, I'm guessing that may be the issue. I see you can adjust the Buffer Size, I'm wondering if that would increase the speed.
Any suggestions as to what values I should set int sz to?

Answer 1

But even if that isn't the issue, if I know it will
be getting text files of large sizes, should I
increase the Buffer size? The app will be running on
a large server.That buffer size will probably not affect the speed of your application since it doesn't change the buffer size for stdin for the process. The buffer associated with stdin is created and held by the OS. An application can't write 1MB to that buffer since the buffer usually is very small, the process which writes to stdin will be blocked/halted when the buffer is full (if you aren't reading it fast enough)
Kaj