aggregatedset是一个集语义，它允许您存储在单一元素和值对数据结构。值会被自动更新（在一个相当“功能性情绪”），整体结构是线程安全的，使用轻便，无锁

A line of code speaks a thousand words :-) Suppose you want to store a counter with each unique element in set (so that it resembles multiset a little). Suppose you have multiple threads raging around. Well, if it seemed like problem, now I hope it does not. First, let"s take care of counting: ``` public final class Counter implements Aggregator { @Override public Integer aggregate(Integer value, Integer current) { if (value == null) return current + 1; return current + value; } @Override public Integer initial() { return 1; } } ``` And plug your counter into this set: AggregatedSet set = new AggregatedSet(new Counter());set.add("A"); //treat it like set.add("A"); //now, it"s set.add("A", 2); // Voila! Let"s say we

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