List Mapping

BoardService.java
List<Board> boards = boardDtos
        .stream()
        .map(Board::toEntity)
        .collect(Collector.toList());


Board.java
public Static Board toEntity(BoardDto boardDto) {
        return Board.builder()
                .boardSeq(boardDto.getBoardSeq())
                .subject(boardDto.getSubject())
                .content(boardDto.getContent())
                .build();
}