Count characters with FileInputStream

   
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import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class Count {
  public static void countChars(InputStream in) throws IOException {
    int count = 0;

    while (in.read() != -1)
      count++;

    System.out.println("Counted " + count + " chars.");
  }

  public static void main(String[] args) throws Exception {
    if (args.length >= 1)
      countChars(new FileInputStream(args[0]));
    else
      System.err.println("Usage: Count filename");
  }
}

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Count characters with FileInputStream : FileInputStream « File Input Output « Java

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