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An output stream that writes bytes to a file. If the output file exists, it can
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A concrete subclass of NumberFormat that formats decimal numbers. It has a
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Vector is an implementation of List, backed by an array and synchronized. All
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An ExecutorService that executes each submitted task using one of possibly
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A TimeUnit represents time durations at a given unit of granularity and provides
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This is the central class in the log4j package. Most logging operations, except
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