Different Project SDK and Language Level

Question

I have recently downloaded IntelliJ IDEA (2018 version) and Java JDK 12. When I was configuring IntelliJ with JDK 12, the Project Language level is stuck at Java 9. Hence, I cannot use the new features in Java 12.

I have searched about this issue over the Internet, but this problem has not yet been identified, mostly because JDK 12 was released just last week (2019 March 19).

Project Structure:

Answer 1

To use new language feature of java12 you need Intellij Idea 2019.1 which has Java 12 Switch Expressions (Preview) support. Then in project structure you could select language level: