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java.util.concurrent.TimeUnit

...out, TimeUnit unit) 需要超时和时间单元(java.util.concurrent.TimeUnit)。如果在特定时间范围内，有任何事件发生，这一方法 …

While it's not a Collections class , per se, the java. util. concurrent. TimeUnit enumeration makes code vastly easier to read.

WatchKey poll(long timeout, TimeUnit unit ) takes a timeout and time units (java. util. concurrent. TimeUnit).