InputMismatchException

Question

我想问一下我为什么要买InputMismathException？

我声明了一个double类型的变量，当我给它赋一个点值时，它抛出了我：

Exception in thread "main" java.util.InputMismatchException
    at java.util.Scanner.throwFor(Scanner.java:909)
    at java.util.Scanner.next(Scanner.java:1530)
    at java.util.Scanner.nextDouble(Scanner.java:2456)
    at Exercises.ComputingMeanAndStandartDeviation_5_21.main(ComputingMeanAndStandartDeviation_5_21.java:18)

代码如下：

package Exercises;

import java.util.*;

public class ComputingMeanAndStandartDeviation_5_21 
{

    public static void main(String[] args) 
    {
        Scanner input = new Scanner(System.in);

        double sum = 0;
        double number = 1;
        double counter = 1;
        System.out.println("Enter ten numbers: ");
        while(counter<10)
        {
            number = input.nextDouble();
            sum +=number;
            counter ++;
        }

        System.out.println(sum + "   " + number + " " + counter);
        double mean = sum / counter;
        System.out.println("The mean is: " + mean);
    }

}

Answer 1

区域设置中的问题

Locale.setDefault(Locale.US);
Scanner input = new Scanner(System.in);

美国小数分隔符"."(78.12)而不是"，"(78,12)