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A Comparator is used to compare two objects to determine their ordering with
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HashSet is an implementation of a Set. All optional operations (adding and
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TimeZone represents a time zone offset, and also figures out daylight savings.
Typically, you get a
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Provides Base64 encoding and decoding as defined by RFC 2045.This class
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A Java virtual machine.
A VirtualMachine represents a Java virtual machine to which this Java vir
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