出现这个错误，是由于项目中有人用jdk1.6 有人用jdk1.7 版本不一样 会一起这个错误。
做如下设置：
-
1.settings/Java Compiler 中设置编译器版本，统一设置成同一个版本；
-
- Project Structure / Project 设置jdk版本和 Project language level
- Project Structure / Project 设置jdk版本和 Project language level
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