Intellij中出现：Diamond types are not supported at this language level

1.解决办法

• File->project -> Modules -> Source -> Language Leve -> 8-Lambda,type annotation etc.

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• File->project -> Project中 -> project Language Level -> 8-Lambda,type annotation etc.

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• Settings -> Build,execution,Deployment -> Compiler -> Java Compiler

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原文：https://blog.csdn.net/liu16659/article/details/80230164