使用带有有效值的Scanner＃nextDouble的InputMismatchException

这是我的扫描仪代码：

import java.util.Scanner;
public class TryDouble {

    public static void main(String  [] args){
        Scanner jin = new Scanner(System.in);
        double a = jin.nextDouble();
        double b = jin.nextDouble();
        double c = jin.nextDouble();
        System.out.println(a + b + c);
    }
}

输入：0.2 0.5 0.9，我得到：

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Unknown Source)
at java.util.Scanner.next(Unknown Source)
at java.util.Scanner.nextDouble(Unknown Source)
at TryDouble.main(TryDouble.java:6)

我该怎么做才能消除该错误？

这是一个区域设置问题：如果要使用。您可以尝试类似：

package test;

import java.util.Locale;
import java.util.Scanner;
public class TryDouble {

    public static void main(String  [] args){
        Scanner jin = new Scanner(System.in).useLocale(Locale.US); 
        double a = jin.nextDouble();
        double b = jin.nextDouble();
        double c = jin.nextDouble();
        System.out.println(a + b + c);
    }
}