android - 如何查询指定特征的java数据在arraylist中的位置
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PHP中文网 2017-04-18 10:05:11
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Peter_Zhu

Record the class it belongs to in Student类里面增加classId, and assign a value to tell the student which class it belongs to when creating the student instance. Knowing that the student will naturally know the class.

If the data volume is several thousand, it is better to use the database directly

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