用点而不是逗号输入double

Question

我的程序中有一个输入需要加倍：

Scanner in_num = new Scanner(System.in);
double num1 = in_num.nextDouble();

但是在上传系统中它会抛出异常java.util.InputMismatchException，我发现这是因为系统将点写为小数点。

在Java中是否有办法用点作为小数点而不是逗号？

Answer 1

1. 将您的扫描仪切换到美国语言环境：

   Scanner sc = new Scanner(System.in);
   sc.useLocale(Locale.US);
   double d = sc.nextDouble();

2. 使用 Double.parseDouble()：

   BufferedReader reader = new BufferedReader(new inputStreamReader(System.in));
   double d = Double.parseDouble(reader.readLine());

Answer 2

I found solution, just had to think a little bit. I've just taken a next String and parsed it to Double.

double num1 = Double.parseDouble(in_num.next());