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- System (java.lang)
Provides access to system-related information and resources including standard
input and output. Ena
- DateFormat (java.text)
Formats or parses dates and times.This class provides factories for obtaining
instances configured f
- Collections (java.util)
This class consists exclusively of static methods that operate on or return
collections. It contains
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HashSet is an implementation of a Set. All optional operations (adding and
removing) are supported.
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This class provides methods that return pseudo-random values.It is dangerous to
seed Random with the
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