Using Java 8 with LibGDX

Question

I'm writing a game in Java using LibGDX, with only desktop as the targeted platform. I just created a new LibGDX project, and imported some existing code into it, but now I'm getting a few errors. Specifically, using the diamond operator. For example, this line of code:

HashMap<String, Integer> connectionsMap = new HashMap<>();

is generating this error:

Error:(20, 37) java: diamond operator is not supported in -source 1.6
(use -source 7 or higher to enable diamond operator)

Ideally, I'd like to use Java 8. The Gradle files in the module I imported were preserved, so I changed the sourceCompatibility line in all the other build.gradle files throughout the project from 1.6 to 1.8, and I made sure that in the Project Structure > Project > Language Level was set to Java 8. However, I'm still getting this issue. What else do I need to change for my project to use Java 8?

It depends what IDE you're using, you need to compile with Java 8. — Jacob G., May 01 '17 at 15:48
@JacobG. I'm using Intellij, I made sure the `Project Structure > Project > Language Level` was set to Java 8 and the run configuration was set to use Java 8 — Thomas, May 01 '17 at 16:31

score 10 · Accepted Answer · answered May 01 '17 at 18:09

10

If you're using IntelliJIDEA, make changes in three places.

sourceCompatibility = 1.8 in build.gradle file of all modules
Project Structure > Project > Language Level
Project Structure > Modules > Sources Tab on all modules > Language Level

answered May 01 '17 at 18:09

Abhishek Aryan

19,936
8
46
65

2

Ah, the Module's language level, that's what I forgot. I wonder why it didn't automatically use the project default.Thanks! – Thomas May 01 '17 at 18:41
How would you add `sourceCompatibility` to the build.gradle file? I added it to the top of the file and got and error. – Jesper Hustad Apr 06 '22 at 15:27
@JesperHustad check this https://stackoverflow.com/a/24862369/3445320 – Abhishek Aryan Apr 06 '22 at 17:34

Using Java 8 with LibGDX

1 Answers1

Linked