File object has been gc'ed.
@param prefix The prefix string to be used in generating the file'sname; must be at least three characters long
@param suffix The suffix string to be used in generating the file'sname; may be null, in which case the suffix ".tmp" will be used
@param directory The directory in which the file is to be created, ornull if the default temporary-file directory is to be used
@return the newly-created empty file
@throws IOException If a file could not be created
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