Java i/o 程序错误 throwFor(Unknown Source)

Question

我正在制作一个程序，用于查看文本文件并将其打印到 eclipse 中的控制台。文本文件中的一行看起来像这样......A.马修斯 4 7 3 10 14 50运行程序时，我收到这样的错误..这是程序import java.io.*;    // for Fileimport java.util.*;  // for Scannerpublic class MapleLeafLab {public static void main(String[] args) throws FileNotFoundException {    Scanner input = new Scanner(new File("mapleleafscoring.txt"));    while (input.hasNextLine()) {        String line = input.nextLine();        Scanner lineScan = new Scanner(line);        String name = lineScan.next(); // e.g. "Eric"        String rest = lineScan.next();        int GP = lineScan.nextInt();          // e.g. 456        int G = lineScan.nextInt();        int A = lineScan.nextInt();        int P = lineScan.nextInt();        int S = lineScan.nextInt();        Double SS = lineScan.nextDouble();        System.out.println(name+rest+" "+GP+" "+G+" "+A+" "+P+" "+S+" "+SS);        //System.out.println(name + " (ID#" + id + ") worked " +        // sum + " hours (" + average + " hours/day)");    }}}

Answer 1

这是 Scanner 的 Javadoc：

https://docs.oracle.com/javase/8/docs/api/java/util/Scanner.html

public double nextDouble()

将输入的下一个标记扫描为双精度...如果下一个标记与上面定义的 Float 正则表达式匹配，则该标记将转换为双精度值...

Returns:

    the double scanned from the input 

Throws:

    InputMismatchException - if the next token does not match the Float regular expression, or is out of range

    NoSuchElementException - if the input is exhausted

    IllegalStateException - if this scanner is closed

你得到NoSuchElementException是因为你试图从 7 个标记的行中读取 8 个标记。

A.Matthews => name

4 => rest

7 => GP 

3 => G 

10 => A 

14 => P 

50 => S

SS =>  NoSuchElementException