BnbId.java

package com.mywonderfulbnb.bnb.definition

final class BnbId {
  private uuid;

  public BnbId(UUID uuid) {
    this.uuid = uuid;
  }
}

OwnerId.java

package com.mywonderfulbnb.bnb.definition

final class OwnerId {
  private uuid;

  public OwnerId(UUID uuid) {
    this.uuid = uuid;
  }
}

Service.java

package com.mywonderfulbnb.bnb.definition

final class Service {
  public addBnb(UUID ownerUuid, UUID bnbUuid, String nameStr) {
    ownerId = new OwnerId(ownerUuid);
    bnbId = new BnbId(bnbUuid);
    name = new Name(nameStr);
  }
}