目录一、原理二、BitMap 相关命令三、BitMap 空间计算四、使用场景1. 用户签到2. 统计活跃用户（用户登陆情况）3. 统计用户在线状态4. 实现布隆过滤器五、总结一、原理
Today I was reading through some Hibernate code and I encounter something interesting. There is a class called CollectionHelper that defines the following constant varibale:
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