泛型錯誤 The type parameter 'T' cannot be used with the 'as' operator

時間 2020-06-07

標籤錯誤 type parameter used operator 简体版

原文原文鏈接

泛型錯誤 The type parameter 'T' cannot be used with the 'as' operator because it does not have a class type constraint nor a 'class' constraint 若是T是接口這是錯誤的：return System.Activator.CreateInstance(reType)

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1. java8 泛型聲明 The diamond operator ("<>") should be used
2. The type org.springframework.http cannot be resolved
3. The type org.springframework.context.ConfigurableApplicationContext cannot be resolved.
4. springboot ：The type org.springframework.context.ConfigurableApplicationContext cannot be resolved.
5. The type org.junit.runners.BlockJUnit4ClassRunner cannot be resolved. It is(報錯)
6. The type javax.servlet.http.HttpServletRequest cannot be resolved.
7. The type org.springframework.jdbc.support.JdbcAccessor cannot be resolved.解決方法
8. HDFS: The short-circuit local reads feature cannot be used
9. - String cannot be resolved to a type - The method getServerName() from the type ServletRequest
10. Flutter報錯The argument type 'Future< String>' can't be assigned to the parameter type 'String'.

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