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An input stream that reads bytes from a file.
File file = ...finally
if (in != null)
in.clos
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An output stream that writes bytes to a file. If the output file exists, it can
be replaced or appen
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This exception is thrown when a program attempts to create an URL from an
incorrect specification.
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A Set is a data structure which does not allow duplicate elements.
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Patterns are compiled regular expressions. In many cases, convenience methods
such as String#matches
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