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An Internet Protocol (IP) address. This can be either an IPv4 address or an IPv6
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Thrown when a hostname can not be resolved.
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This class generates cryptographically secure pseudo-random numbers. It is best
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The BitSet class implements abit array [http://en.wikipedia.org/wiki/Bit_array].
Each element is eit
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HashMap is an implementation of Map. All optional operations are supported.All
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Patterns are compiled regular expressions. In many cases, convenience methods
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