错误与扫描仪

我试图从互联网上获取数据库，但该错误已消失。错误与扫描仪

package space; 
import java.io.File; 
import java.io.IOException; 
import java.net.MalformedURLException; 
import java.util.Scanner; 
import java.net.URL; 
public class ArrayIntro { 
public static void main(String[] args) throws Exception { 
     String urlbase = "https://learnjavathehardway.org/txt/"; 
     double[] temps = arrayFromUrl(urlbase + "avg-daily-temps-atx.txt"); 

     System.out.println(temps.length + " temperatures in database."); 

     double lowest = 9999.99; 

     for (int i=0; i<temps.length; i++) { 
      if (temps[i] < lowest) { 
       lowest = temps[i]; 
      } 
     } 

     System.out.print("The lowest average daily temperature was "); 
     System.out.println(lowest + "F (" + fToC(lowest) + "C)"); 
    } 

    public static double[] arrayFromUrl(String url) throws Exception { 
     Scanner fin = new Scanner((new URL(url)).openStream()); 
     int count = fin.nextInt(); 

     double[] dubs = new double[count]; 

     for (int i=0; i<dubs.length; i++) 
      dubs[i] = fin.nextDouble(); 
     fin.close(); 

     return dubs; 
    } 

    public static double fToC(double f) { 
     return (f-32)*5/9; 
    } 
}

值数是6717.我试图找到链接https://learnjavathehardway.org/txt/avg-daily-temps-atx.txt的最低温度。

和错误是这样的：

Exception in thread "main" java.util.InputMismatchException 
    at java.util.Scanner.throwFor(Scanner.java:864) 
    at java.util.Scanner.next(Scanner.java:1485) 
    at java.util.Scanner.nextDouble(Scanner.java:2413) 
    at space.ArrayIntro.arrayFromUrl(ArrayIntro.java:43) 
    at space.ArrayIntro.main(ArrayIntro.java:20) 
C:\Users\Administrator\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1 
BUILD FAILED (total time: 3 seconds)

来源

2017-09-04 Space

和'.'是一个有效的小数点分隔符在你的语言环境？ – Tom

是什么意思？ – Space

你如何在你的国家写下“一半”？ '0.5'还是'0,5'？如果它是'0,5'，那么你显然不能读取像'0.5'这样的数字，因为格式是错误的。 – Tom

在Scanner，你可以用它来与Locale指定Locale像dot.作为小数点分隔符：

Scanner fin = new Scanner((new URL(url)).openStream()).useLocale(Locale.ENGLISH);

来源

2017-09-04 12:27:55 Abdelhak

错误与扫描仪

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