Java I / O程序错误throwFor（未知源）

Question

我正在制作一个程序，该程序可查看文本文件并将其以eclipse格式输出到控制台。文本文件中的其中一行看起来像这样……

  

A.Matthews 4 7 3 10 14 50

在运行程序时，出现这样的错误。

这是程序

import java.io.*;    // for File
import java.util.*;  // for Scanner

public 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

这是扫描仪的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   然后令牌将转换为双精度值...

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

您之所以得到NoSuchElementException，是因为您试图从7个令牌行中读取8个令牌。

A.Matthews => name
4 => rest
7 => GP 
3 => G 
10 => A 
14 => P 
50 => S
SS =>  NoSuchElementException