- project structure中的project ，SDK選擇1.8，Project language level選擇8
- project structure中的module，選擇Language level為8
- setting中的java compiler
idea報錯Diamond types are not supported at this language level
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Diamond types are not supported at language level '5'
idea language level 介紹
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react @types/react-router-dom報錯
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Kotlin: Language version 1.1 is no longer supported; please, use version 1.2 or greater.