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Return the contained value, if present, otherwise throw an exception to be
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A specialized Reader that reads from a file in the file system. All read
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Allows reading from and writing to a file in a random-access manner. This is
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A thread is a thread of execution in a program. The Java Virtual Machine allows
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A java.util.Queue that additionally supports operations that wait for the queue
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A reentrant mutual exclusion Lock with the same basic behavior and semantics as
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