Underscores in literals are not supported at this language level

Question

I got this error when creating the final double, using underscores to make the double readable. It was declared in the run() method.

 public void run() { final double nanoSeconds = 1_000_000_000.0 / 60.0; } 

I am using IntelliJ IDEA 12.

Answer 1

In IntelliJ IDEA you need to change the Project language level in the project settings to level 7.0 :

Answer 2

Yes. You need to change the default language level settings, if you use, and the IDE. For IntelliJ users, this is located under File → Project Structure → Projects.