OfferDB create the class OfferDB to store and get offer details into and from the database: addOffer(String/int/ userID, String itemCodeOwn, String itemCodeWant, String/int/ itemStatus) this method adds an offer to the database. The userID here refers to the user that is making the offer and itemCodeOwn is the itemCode that this user owns and itemCodeWant is the item code they would like to get. updateOffer(String/int/ offerID, String/int/ itemStatus) this method updates the status of the offer in the database. FeedbackDB create the class FeedbackDB to store and retrieve the feedback users give for items and other users from the database: addOfferFeedback(int offerID, int userID1, userID2, int rating) this method adds a feedback that user with userID1 is giving for user with userID2. Both users have completed a swap. Using the offerID we can verify and link this to an offer. The corresponding database table would use the offerID and userID1 as primary keys. addItemFeedback(String itemCode, int userID, int rating) this method adds a feedback that user with userID is giving for item with itemCode. The corresponding database table would use the userID and itemCode as primary keys.