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Represents a command that can be executed. Often used to run code in a different
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A Map is a data structure consisting of a set of keys and values in which each
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TreeSet is an implementation of SortedSet. All optional operations (adding and
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This is the central class in the log4j package. Most logging operations, except
configuration, are d
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A generic Abstract Window Toolkit(AWT) container object is a component that can
contain other AWT co
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