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Represents a command that can be executed. Often used to run code in a different
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A Set is a data structure which does not allow duplicate elements.
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TimeZone represents a time zone offset, and also figures out daylight savings.
Typically, you get a
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A plug-in replacement for JDK1.5 java.util.concurrent.ConcurrentHashMap. This
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This is the central class in the log4j package. Most logging operations, except
configuration, are d
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