public void addOperation(String type,String date,String filename,FileHistory history){
  OperationMemo r=new OperationMemo();
  r.type=type;
  r.date=date;
  r.filename=filename;
  r.history=history;
  list.add(r);
}

public void addOperation ( String type , String date , String filename , FileHistory history ) { OperationMemo r = new OperationMemo ( ) ; r . type = type ; r . date = date ; r . filename = filename ; r . history = history ; list . add ( r ) ; }
used to add a revision form complete information created elsewhere
