Java 如何输入双变量？

当我运行此代码并为第一个变量输入双精度值时，即 它在read.nextDouble（）行上显示一个错误，作为线程“main”java.util.InputMismatchException中的异常

/**
 * Created by Ranjan Yadav on 1.10.2016.
 */
public class GasMileage {
    public static void main(String[] args){
        java.util.Scanner read = new java.util.Scanner(System.in);
        int counter = 0;
        System.out.println("Miles Driven(press 1 to quit): ");
        double miles = read.nextDouble();
        double totalGalon = 0;
        double totalMiles = 0;
        double milesPerGalon = 0;
        double totalMilesPerGalon = 0;
        totalMiles += miles;
        while(miles != 1){
            System.out.println("Gallon used: ");
            double galon = read.nextDouble();
            counter++;
            milesPerGalon = miles / galon;
            totalMilesPerGalon += milesPerGalon;
            System.out.println("Miles per gallon: " + milesPerGalon);
            System.out.println("Miles Driven(press 1 to quit); ");
            miles = read.nextDouble();
            totalGalon += galon;
            totalMiles += miles;
        }
        if(counter == 0 ){
            System.out.println("No values were entered.\nThanks for Using!\n\n");
        }else{
            double avg = totalMilesPerGalon / counter;
            System.out.printf("Total miles driven: %.2f" , totalMiles);
            System.out.printf("Total gallons used: %.2f" , totalGalon);
            System.out.printf("Miles per gallon for all trips: %.2f" , totalMilesPerGalon);
        }
    }
}

从：

抛出：

• InputMismatchException

  -如果下一个标记与浮点正则表达式不匹配或超出范围

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基本上，您输入的不是数字。

您输入的是什么？代码对我来说很好，也许是您的输入造成了问题？编辑：也许你输入的是“3,7”而不是“3.7”？我用intellij写了100.23英里。好吧。。。另一个

read.nextDouble

s呢？那么您键入“100.23”，按enter键，它会立即引发异常？