File -> Project Structure -> Project Settings>>Project>Project language 应与JDK吻合
File -> Project Structure -> Project Settings>>Modules>Modules language
File -> Settings -> Compiler -> Java Compiler -> Target bytecode version
File -> Project Structure -> Project Settings>>Project>Project language 应与JDK吻合
File -> Project Structure -> Project Settings>>Modules>Modules language
File -> Settings -> Compiler -> Java Compiler -> Target bytecode version
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