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Return the contained value, if present, otherwise throw an exception to be
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Thrown when a file specified by a program cannot be found.
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Provides access to system-related information and resources including standard
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This class contains various methods for manipulating arrays (such as sorting and
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A linear collection that supports element insertion and removal at both ends.
The name deque is shor
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This is the central class in the log4j package. Most logging operations, except
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