public void remove(T line){
  int idx=_list.indexOf(line);
  if (idx != -1)   remove(idx);
}

public void remove ( T line ) { int idx = _list . indexOf ( line ) ; if ( idx != - 1 ) remove ( idx ) ; }
helper - function that resolves to remove ( int ) . removes the line associated with the dataline line . if no matching dataline exists , nothing happens .
