从TXT文件中一行一行读取数字

import Java.io.FileReader;

import java.io.IOException;

import java.io.LineNumberReader;

import java.io.StreamTokenizer;

public class SumLine {

public static void main(String[] a)throws IOException {

sumLines("file.txt");

}

static void sumLines(String filename) throws IOException {

LineNumberReader lnr = new LineNumberReader(new FileReader(filename));

lnr.setLineNumber(1);

StreamTokenizer stok = new StreamTokenizer(lnr);

stok.parseNumbers();

stok.eolIsSignificant(true);

stok.nextToken();

while (stok.ttype != StreamTokenizer.TT_EOF) {

int lineno = lnr.getLineNumber();

double sum = 0;

while (stok.ttype != StreamTokenizer.TT_EOL) {

if (stok.ttype == StreamTokenizer.TT_NUMBER)

sum += stok.nval;

stok.nextToken();

}

System.out.println("Sum of line " + lineno + " is " + sum);

stok.nextToken();

}

}

}