很多人以为集合就是集合，HashMap就是 HashMap，没啥好优化的。 fastutil 用实际数据告诉你：差距可以大到 10 倍。 fastutil 是米兰大学教授 Sebastiano Vigna 开发的 Java 集合库，2200+ Star 它的定位很简单：把 Java 标准集合库的性能发挥到极致。 为什么标准库慢 先说根本 ...

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