Add an array of filenames to this FileResourceIterator.
int start = (files == null) ? 0 : files.length;
String[] newfiles = new String[start + s.length];
if (start > 0) {
System.arraycopy(files, 0, newfiles, 0, start);
}
files = newfiles;
System.arraycopy(s, 0, files, start, s.length);