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Rick Ross http://www.dzone.com

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Speeding up Java I/O - Read method

The following example counts the number of newline bytes ('\n') in a file. It simply uses the read method on a FileInputStream: 

 import java.io.*;
  
  public class intro1 {
    public static void main(String args[]) {
      if (args.length != 1) {
        System.err.println("missing filename");
        System.exit(1);
      }
      try {
        FileInputStream fis =
            new FileInputStream(args[0]);
        int cnt = 0;
        int b;
        while ((b = fis.read()) != -1) {
          if (b == '\n')
            cnt++;
        }
        fis.close();
        System.out.println(cnt);
      }
      catch (IOException e) {
        System.err.println(e);
      }
    }
  }


Subject to Sun's Code Sample License
to java io performance optimizing by rick on May 17, 2008
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