从TXT文件中读取数字

王朝other·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

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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