반복문

		List<String> reservedTimeList = new ArrayList<>();
		if (reservedTime != null) {
		    for (ReservationContact contact : reservedTime) {
		        reservedTimeList.add(contact.getReservationTime());
		    }
		}
		System.out.println(reservedTimeList);

위와 같이 해야 nullpoint에러가 나지 않았다.

		List<ReservationContact> reservedTime = null;
		List<String> reservedTimeList = null;
        
        ReservationContact reservation = new ReservationContact();
		reservation.setClinicInstinum(clinicInstinum);
		reservation.setReservationDate(reservationDate);
		
		reservedTime = clinicContactDao.reservedTime(reservation);
		System.out.println("reservedTime : " + reservedTime);
		System.out.println(reservedTime.get(0).getReservationTime()); 
		System.out.println(reservedTime.size());
        
        
        for(int i = 0; i < reservedTime.size(); i++) {
			reservedTimeList.add(i,reservedTime.get(i).getReservationTime());
			System.out.println(reservedTimeList.get(i));
		}

 

reservationTimeList 리스트를 null로 초기화 하지 않았기 때문에 값이 안들어갔던 것이다.

기본이 많이 부족하구나 싶다.....자바공부좀 다시 정리해야겠다