今天在写lambda函数时，Intellij爆出了”lambda expressions not supported at this language level”的错误。很明显这是IDE里JDK的版本没有设置正确引起的。下面来说说怎么在IDE里设置一下JDK版本解决这个问题。
1.修改project的JDK版本
File -> Project Structure -> Project，将Project Language Level设置为8.0 - Lambdas, type annotations etc.这一项。
2.修改module的JDK版本
将Project选项里的jdk版本修改以后还不够，还需要将对应module版本也修改正确。File -> Project Structure -> Modules里，将Language Level也设置为8.0 - Lambdas, type annotations etc.这一项。
将以上两项都修改完毕以后，就OK了。
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