A DESCRIPTION OF THE REQUEST :
File.list(FilenameFilter)
File.listFiles(FilenameFilter)
File.listFiles(FileFilter)

all create the resultant list of files using the reflective form of toArray. As these methods are intensive already, seems like this is a silly thing to do.

Code should be changed to


return (File[])(v.toArray(new File[v.size()]));


JUSTIFICATION :
performance