按数据类型从带有扫描仪的文件中读取

import java.io.FileReader;

import java.io.BufferedReader;
/* 
 来自 
*nowjava*/

import java.io.IOException;

import java.util.Scanner;

import java.util.Locale;


public class ScanSum {

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


        Scanner s = null;

        double sum = 0;


        try {

            s = new Scanner(new BufferedReader(new FileReader(

                    "usnumbers.txt")));

            s.useLocale(Locale.US);


            while (s.hasNext()) {

                if (s.hasNextDouble()) {//来 自 N o w J a v a . c o m

                    sum += s.nextDouble();

                } else {

                    s.next();

                }

            }

        } finally {

            s.close();

        }


        System.out.println(sum);

    }

}