New class -> not showing Java
已回答
I created plain Java project and was practicing.
I added packages and class that are Java and were fine.
And suddenly adding new class not show Java Class but Kotlin.
How to go back to Java class ?
'Java Class' is missing...

Miro
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Please try File | Manage IDE Settings | Restore Default Settings...: https://i.imgur.com/kbrkC7w.png.
Notice that you have a descending hierarchy of packages with a "special" name.
It looks like your package fails.
Check that it is spelled correctly: io.namoosori.3.8.graphiceditor.step01
Finally refresh the project and see if you can create the class.
thank you ~ removing number in package fixed. ( 3.8 part )
package name with only numeric is prohibited, I learned.
i restarted the IDE and the mine isse is solved
In Java, numbers themselves can't be used as package names but can be put at the end of package names such as "user1". If this is not your case, please provide the sample project via GitHub or upload it to https://uploads.jetbrains.com/ and paste the upload ID here. The uploaded file is only visible to JetBrains employees.