本内容遵循CC 4.0 BY-SA版权协议 上一篇用LongAccumulator处理可以合并的统计样本。配置更新面对的是另一类问题：版本号、超时值和路由列表需要一起变化，读取者也希望拿到同一份状态。把这些字段装进不可变对象，再整体替换引用，能让更新边界更容易看清。

An array in Java is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created and cannot be changed.

// Most asked problems at FAANG companies: https://docs.google.com/spreadsheets/d/1hzP8j7matoUiJ15N-RhsL5Dmig8_E3aP/edit#gid=1377915986 ...

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