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Provides access to system-related information and resources including standard
input and output. Ena
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A Uniform Resource Identifier that identifies an abstract or physical resource,
as specified by RFC
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HashSet is an implementation of a Set. All optional operations (adding and
removing) are supported.
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An ordered collection (also known as a sequence). The user of this interface has
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A PriorityQueue holds elements on a priority heap, which orders the elements
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Timers schedule one-shot or recurring TimerTask for execution. Prefer
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