SumFile.java Source code

Introduction

Here is the source code for SumFile.java

Source

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.io.StreamTokenizer;

// The buffering makes the program more than 20 times faster.
public class SumFile {

    public static void main(String[] a) throws IOException {
        sumfile("file.txt");
    }

    static void sumfile(String filename) throws IOException {
        Reader r = new BufferedReader(new FileReader(filename));
        StreamTokenizer stok = new StreamTokenizer(r);
        stok.parseNumbers();
        double sum = 0;
        stok.nextToken();
        while (stok.ttype != StreamTokenizer.TT_EOF) {
            if (stok.ttype == StreamTokenizer.TT_NUMBER)
                sum += stok.nval;
            else
                System.out.println("Nonnumber: " + stok.sval);
            stok.nextToken();
        }
        System.out.println("The file sum is " + sum);
    }

}