java - 需要过滤 2 个列表并在 java 中添加到单独的列表中

Question

我有 2 个列表:

• avaliableRoomType - [标准，超豪华]
• wholeRoomtype - [标准、超豪华、豪华]

我需要过滤它并添加到单独的列表 unavailableRoomtype - [Deluxe]

for(int j = 0; j <  avaliableRoomType.size()  ; j++) {

        for(int i = 0; i < wholeRoomtype.size(); i++) {

            String tempAv = avaliableRoomType.get(j);
            String tempHotelRoomId = wholeRoomtype.get(i);

            if(!tempAv.equals(tempHotelRoomId)){


            unavailableRoomtype.add(tempHotelRoomId);


            }

        }

    }

但我有重复的值。

Answer 1

List<String> unavailableRoomtype = new ArrayList<>();

for (String roomType : wholeRoomtype) {
  if (!avaliableRoomType.contains(roomType)) {
    unavailableRoomtype.add(roomType);
  }
}