public static List<Object> mergeLists(final List<Object> col1,final List<Object> col2){
  final List<Object> m=new ArrayList<>();
  m.addAll(col1);
  m.addAll(col2);
  return m;
}

public static List < Object > mergeLists ( final List < Object > col1 , final List < Object > col2 ) { final List < Object > m = new ArrayList < > ( ) ; m . addAll ( col1 ) ; m . addAll ( col2 ) ; return m ; }
merges to lists into one .
