钻石算子在想法中得到编译错误

Question

I am getting this error while trying to compile some simple source code in idea ide.

java: diamond operator is not supported in -source 1.6 (use -source 7 or higher to enable diamond operator)

jdk is 1.7.40 from oracle

but where is this place to add this "-source 7" option?

i tried adding in ide settings but that had no effect.

Answer 1

You need to set the project language level (default for all modules) and the module(s) language level

Answer 2

Make sure that, in the Project Structure page, you have set your project language level to 7.0.

After you select this, you will have to reopen your project, but then your diamond operators should compile.

Answer 3

Check Project Structure tab in IDEA, find the followng navigational path

Project Structure -> Project -> Project SDK

Answer 4

Follow these steps.

Right Click on the project------>> go to Open module Settings--->
In that opening window click the Project in project settings---->
and set project SDK