@Override public int compare(File lhs,File rhs){
  return lhs.lastModified() > rhs.lastModified() ? -1 : 1;
}

@ Override public int compare ( File lhs , File rhs ) { return lhs . lastModified ( ) > rhs . lastModified ( ) ? - 1 : 1 ; }
compare its lastmodified param to determine display order
