How to read number of lines in file without opening file in to buffer?

Asked Aug 17 '11 at 15:26

Active Jan 17 '19 at 06:19

Viewed 305 times

I need to count the number of lines in a file.

The number of lines in a file will increase/decrease, so I have to check this regularly.

I have written this code into a thread to execute always.

I have opened a BufferedReader() on the file object to read the number of lines (.readLine()).

My problem is GC is running frequently if I am opening Bufferedreader() every time.

I am closing the buffer object and assigning it to NULL after usage, but still I am facing the problem.

So I dropped the idea of opening the buffer only to count the number of lines.

I used Scanner() to open the file object, But I am getting outofMemomryException with Scanner class. I have done some investigation about Scanner class and came to know that it will fail to open if file size is large. (my file will have around 200 000 lines).

Please suggest me the less expensive (in terms of memory) way of counting the number of lines from a file.

edited Jan 17 '19 at 06:19

Ronan Boiteau

8,910
6
33
52

asked Aug 17 '11 at 15:26

brig

3,490
12
40
60

1

Possible pointers here "Number of lines in a file in Java " - http://stackoverflow.com/questions/453018/number-of-lines-in-a-file-in-java – ring bearer Aug 17 '11 at 15:31
see http://stackoverflow.com/questions/453018/number-of-lines-in-a-file-in-java – jirka.pinkas Aug 17 '11 at 15:33
It would be useful to see your code for BufferedReader. – rossum Aug 17 '11 at 16:11

How to read number of lines in file without opening file in to buffer?

0 Answers0