如何用点格式化双精度?

How to format Double with dot?(如何用点格式化双精度?)

问题描述

如何将带有 String.format 的 Double 格式化为在整数和小数部分之间加点​​的字符串?

How do I format a Double with String.format to String with a dot between the integer and decimal part?

String s = String.format("%.2f", price);

以上格式只用逗号:",".

The above formats only with a comma: ",".

推荐答案

String.format(String, Object ...) 正在使用您的 JVM 的默认语言环境.您可以使用 String.format(Locale, String, Object ...) 或 java.util.Formatter 直接.

String.format(String, Object ...) is using your JVM's default locale. You can use whatever locale using String.format(Locale, String, Object ...) or java.util.Formatter directly.

String s = String.format(Locale.US, "%.2f", price);

或

String s = new Formatter(Locale.US).format("%.2f", price);

或

// do this at application startup, e.g. in your main() method
Locale.setDefault(Locale.US);

// now you can use String.format(..) as you did before
String s = String.format("%.2f", price);

或

// set locale using system properties at JVM startup
java -Duser.language=en -Duser.region=US ...

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