Scanner.nextDouble（）：用“。”读取double。(Scanner.nextDouble(): reading double with “.”)

Scanner.nextDouble（）：用“。”读取double。(Scanner.nextDouble(): reading double with “.”)

我对Java类Scanner有一点问题：我需要读取一个包含Double值的文件（.dat），但似乎方法Scanner.nextDouble只能识别这样写的数字：1234,5678，带有“，”但不是“。”。 我想知道是否有办法改变它，因为该文件是由另一个软件生成的，所以我不能让它改变“，”为“。”。

谢谢罗宾

I'm have a little problem with the Java class Scanner: I need to read a file (.dat) that contains Double values, but it seems like the method Scanner.nextDouble only recognize number written like this: 1234,5678 , with a "," but not with a ".". I wanted to know if there was a way to change that, because the file is generated by another software, so I can't make it change the "," for a ".".

Thanks Robin

最满意答案

看起来您的默认Locale对double值使用基于逗号的小数分隔符。 尝试使用

scanner.useLocale(Locale.ENGLISH);

It seems like your default Locale uses a comma-based decimal separator for double values. Try using

scanner.useLocale(Locale.ENGLISH);