检查以下3个地方的jdk版本是否一致:
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Project Structure里确认两个地方:Project sdk以及project language level
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Project Structure->Modules里Sources里的Language level
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Preferences->java Compiler->Per-module bytecode Version
Project Structure里确认两个地方:Project sdk以及project language level
Project Structure->Modules里Sources里的Language level
Preferences->java Compiler->Per-module bytecode Version