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Return the contained value, if present, otherwise throw an exception to be
created by the provided s
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Provides access to system-related information and resources including standard
input and output. Ena
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Uses a one-way hash function to turn an arbitrary number of bytes into a
fixed-length byte sequence.
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Formats or parses dates and times.This class provides factories for obtaining
instances configured f
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This class contains various methods for manipulating arrays (such as sorting and
searching). This cl
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A task that returns a result and may throw an exception. Implementors define a
single method with no
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This is the central class in the log4j package. Most logging operations, except
configuration, are d
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