How to change project language level for all project in Intellij

Question

I am using Intellij. It is good, but when I create a new project or import a project the default project language level set to 6 (@override in interfaces). But I want to set

Answer 1

I had same problem. Changing IntelliJ IDEA setting files (misc.xml, compiler.xml) has not helped. Then I changed language level in two places:

1) File -> Project Structure -> Modules, "Sources" tab, Language level 8 (or higher).

2) Settings -> Build, Execution,Deployment -> Compiler -> Java Compiler -> Target bytecode version (version 1.8)

This worked fine.