Number of lines in a file in Java

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We use huge data files. Sometimes we only need to know the number of lines in these files, usually, I open them up and read them line by line, until I reach the end of the file.
Is there a better way to do it?
Jul 3, 2018 in Java by samarth295
• 2,190 points
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0 votes

I found this an efficient way in counting rows:

try
(
   FileReader       input = new FileReader("input.txt");
   LineNumberReader count = new LineNumberReader(input);
)
{
   while (count.skip(Long.MAX_VALUE) > 0)
   {
      // Loop just in case the file is > Long.MAX_VALUE or skip() decides to not read the entire file
   }
   result = count.getLineNumber() + 1;  
}
answered Jul 3, 2018 by scarlett
• 1,280 points

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