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);
}
}
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