积分系统从来不是计数器，它是一套完整的小型资产管理系统。今天我把这道题拆成 5 层，从青铜到王者，带你彻底搞懂。 上周有个兄弟找我复盘字节跳动电商事业群的面试，他三年多 Java 开发经验，技术面前两轮都过了，结果三面被一道题直接干翻。 面试官问得特别朴实： "咱们要做一个用户积分体系，用户消费送积分，积分一年过期。数据库怎么设计？积分过期怎么算？提醒怎么发？" 这哥们心想这题还不简单？张口就来： ...

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