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A connection represents a link from a Java application to a database. All SQL
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The TimerTask class represents a task to run at a specified time. The task may
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A task that returns a result and may throw an exception. Implementors define a
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A counting semaphore. Conceptually, a semaphore maintains a set of permits. Each
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A TimeUnit represents time durations at a given unit of granularity and provides
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