【Java】頼むからDTOをしっかりと実装して欲しいお話

public class BandInfoDao {
	public List<BandInfoDto> getBandInfo(Connection con, String userId){
		List<BandInfoDto> bandInfo = new ArrayList<BandInfoDto>();
		/*
		 * TODO
		 * データベースに接続してselect Bandname, BandBirthDay, BandType from...
		 * とかでバンドの情報をとってきてListにaddしていく。
		 *
		 * (ex)
		 * BandInfoDto tmp = new BandInfoDto(rs.getString(1), rs.getInt(2), rs.getInt(3));
		 * bandInfo.add(tmp);
		 */
		return bandInfo;
	}
}

public class BandInfoDto {
	private String bandname;
	private int bandCreateYear;
	private int bandType;

	public BandInfoDto(String bandname, int bandCreateYear, int bandType) {
		this.bandname = bandname;
		this.bandCreateYear = bandCreateYear;
		this.bandType = bandType;
	}
	public String getBandname() {
		return bandname;
	}
	public int getBandCreateYear() {
		return bandCreateYear;
	}
	public int getBandType() {
		return bandType;
	}
	@Override
	public String toString() {
		return "BandInfoDto [bandname=" + bandname + ", bandCreateYear=" + bandCreateYear + ", bandType=" + bandType + "]";
	}
}

public class service {
	private final static int BOYS = 1;
	private final static int GIRLS = 2;
	public String CheckBandType(BandInfoDto bandInfo){
		int bandType = bandInfo.getBandType();
		switch(bandType){
		case BOYS:
			return "やろばん";
		case GIRLS:
			return "ギャルバン";
		default:
			return "混声";
		}
	}
}