Speeding up Java I/O - Read method

rick (Rick Ross) — Sat, 17 May 2008 14:49:13 GMT

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

DZone Snippets: Rick's Code Snippets

Speeding up Java I/O - Read method