android--------解決Entities and POJOs must have a usable public constructor

本文轉載自查看原文 2020-02-06 13:42 1155

　　　　　今天在學習android數據庫，運行程序的時候報錯，錯誤是：Entities and POJOs must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type).Tried the following constructors but they failed to match:

Word(java.lang.String,java.lang.String) -> [param:english_word -> matched field:unmatched, param:chinese_meaning -> matched field:unmatched]。

　　　解決方法:在實體類寫一個空的構造函數即可。

　　因為我有一個有參的構造函數，於是我寫了一個空的構造函數即可運行。

　　寫一個空的構造函數：

　　運行成功：

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