1.File->Setting->Build->Complier->Java Compiler->Project bytecode version/Module->Target bytecode version
2.File->Setting->Build->Maven->importing->JDK for importer
3.File->Project Structure->Modules->Language level
4.File->Project Structure->SDKs **
5.File->Project Structure->Project->Project SDK **
6.pom.xml
<java.version> </java.version>
IDEA JDK版本切换
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