- project structure中的project ，SDK选择1.8，Project language level选择8
- project structure中的module，选择Language level为8
- setting中的java compiler
idea报错Diamond types are not supported at this language level
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Diamond types are not supported at language level '5‘
diamond types are not supported at this language level
Diamond types are not supported at language level '5'
Idea中JDK为1.8，还提示Diamond types are not supported at this language level
idea language level 介绍
try中定义输入流报错：Try-with-resources are not supported at language level '5'
解决Lambda报错—Lambda expressions are not supported at language level '5'（语言级别“5”不支持Lambda表达式）
出现错误lambda expressions are not supported at language level 7解决方法
Maven使用中遇到的问题-Lambda expressions are not supported at language level '5'
Intellij IDEA Module 的Language Level的问题