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This class consists exclusively of static methods that operate on or return
collections. It contains
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A Map is a data structure consisting of a set of keys and values in which each
key is mapped to a si
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A map that has its keys ordered. The sorting is according to either the natural
ordering of its keys
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Timers schedule one-shot or recurring TimerTask for execution. Prefer
java.util.concurrent.Scheduled
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A TimeUnit represents time durations at a given unit of granularity and provides
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This is the central class in the log4j package. Most logging operations, except
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