What is the difference between creating a locale for en-US and en_US?

Question

I have all my ResourceBundle values in a table and formatted as per requirement. I have to change the languages on the website based on user selection in a drop

Answer 1

As of Java8, initializing the locale should be done using the language tag en-US. Locale.forLanguageTag("en-US").toString(); returns the output: en_US

Where as Locale.forLanguageTag("en_US") does not create the required locale. It will default to the system locale. Locale.forLanguageTag("en_US").toString() returns null