1、查看项目的jdk(Ctrl+Alt+shift+S)
File ->Project Structure->Project Settings ->Project
2.查看工程的jdk(Ctrl+Alt+shift+S)
File ->Project Structure->Project Settings -> Modules -> (需要修改的工程名称) -> Sources ->
3.查看idea中的java配置
3.1 File-other settings->default setting
3.2 File->setting