File -> Project Structure -> Project Settings>>Project>Project language 應與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 應與JDK吻合

File -> Project Structure -> Project Settings>>Modules>Modules language

File -> Settings -> Compiler -> Java Compiler -> Target bytecode version

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