How to transform List to another List [duplicate]

Answer 1

assume have two object can interconversion, Coach and EntityBase

1.declare generic method

   public static  void ToList(List list, List results) {
    if (list.size() > 0) {
        for (TSourse obj : list) {
            TResult tResult = (TResult) obj;
            if (tResult == null) {
                throw new AppException("error....");
            }
            results.add(tResult);
        }
    }
}

2.call this method

  List entityBaseList = new ArrayList<>();
    Coach coach = new Coach();
    coach.setId("123");
    entityBaseList.add(coach);

    List coachList = new ArrayList<>();
    ToList(entityBaseList, coachList);
    //will complete List to another List