--- title: "Video rental shop class diagram" subject: "Object Oriented Analysis and Design" chapter: 2 key: "semester_6/object_oriented_analysis_and_design:video-rental-class-diagram" source: https://www.bctengineer.com/q/semester_6/object_oriented_analysis_and_design/video-rental-class-diagram site: BCT Engineering --- # Video rental shop class diagram Object Oriented Analysis and Design · Chapter 2: Object Oriented Analysis - Asked in: 2069 Bhadra, 12 marks - Video: [How to draw Class Diagram?](https://www.youtube.com/watch?v=-UTEeuu6gvI) — MADE_EASY_FOR_YOU - Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14 - Page: https://www.bctengineer.com/q/semester_6/object_oriented_analysis_and_design/video-rental-class-diagram - Whole chapter: https://www.bctengineer.com/md/semester_6/object_oriented_analysis_and_design/chapter-2 ## Question The Premier Video Rental Shop (PVRS) decides to implement a database-based information system. PVRS acquires the video from the importer or chain trade. An agreement will be signed with both partners and it defines the date, number of copies, time frame of the lease and purchase price. As an additional info of importer also the address and bank details will be recorded. The customer rents a video from the PVRS. From each video the name, ID and rental price information will be recorded. The rental price is calculated from the rental period, the purchase price and the customer relationship. Video types include action, art and children's video. Video may also be a blend of action and art videos. As an action video info the degree of violence will be recorded, and from art videos the awards and from children's videos the age limit. The customer relationship can be a random customer, regular or member of PVRS club. As an overarching customer info the name will be recorded and from regular customer the cumulative sum of the number of rental events. From the members of PVRS club information, the member address is used in order to advertise new products and offers. Draw a class diagram, which presents the main classes, properties, methods, and relationships between classes. ## Short answer The class diagram includes Partner (Importer, ChainTrade) linked to Agreement (date, copies, leaseTime, price) which links to Video (name, id, rentalPrice). Video generalizes to ActionVideo (violenceDegree), ArtVideo (awards), ChildrenVideo (ageLimit) with overlapping between Action and Art. Customer generalizes to RandomCustomer, RegularCustomer (cumulativeRentals), ClubMember (memberAddress, advertise). Rental links Customer and Video with rentalPeriod and calcPrice(). ## Answer **Assumptions:** PVRS is the shop; an `Agreement` is made for each acquisition from a `Partner` (importer or chain trade); a `Rental` links a customer with videos. #### Classes, attributes and methods | Class | Attributes | Methods | |---|---|---| | Partner (abstract) | name | - | | Importer | address, bankDetails | - | | ChainTrade | - | - | | Agreement | date, copies, leaseTime, purchasePrice | sign() | | Video (abstract) | name, id, rentalPrice | calcRentalPrice() | | ActionVideo | violenceDegree | - | | ArtVideo | awards | - | | ChildrenVideo | ageLimit | - | | Customer (abstract) | name | - | | RandomCustomer | - | - | | RegularCustomer | cumulativeRentals | - | | ClubMember | memberAddress | advertise() | | Rental | rentalPeriod, date | calcPrice() | #### Class diagram ```text Partner (importer or chain trade) +----------+ 1 * +-----------+ * 1..* +--------+ | Partner |-------| Agreement |----------| Video | |----------| |-----------| |--------| | name | | date | | name | +----------+ | copies | | id | ^ ^ | leaseTime | | rental | | | | price | | Price | Importer Chain +-----------+ +--------+ -address Trade ^ ^ ^ -bank Action Art Children -viol. -awards -ageLimit {overlapping: Action, Art} +----------+ 1 * +--------+ * 1..* +--------+ | Customer |-------| Rental |----------| Video | |----------| |--------| +--------+ | name | | period | +----------+ | price()| ^ ^ ^ +--------+ Random Regular ClubMember -total -address Rentals +advertise() ``` #### Relationships - `Partner` generalizes `Importer` and `ChainTrade`; a `Partner` has many `Agreement`s; each `Agreement` covers one or more `Video`s. - `Video` is generalized into `ActionVideo`, `ArtVideo`, `ChildrenVideo`. Since a video may be a blend of action and art, the generalization is marked **{overlapping}**. - `Customer` is generalized into `RandomCustomer`, `RegularCustomer`, `ClubMember` ({disjoint}). - `Customer` 1 to many `Rental`; `Rental` many to 1..* `Video`. - Rental price is derived: `calcRentalPrice() = f(rentalPeriod, purchasePrice, customer type)` (the customer relationship gives the discount). ## Check yourself The answer's key points as multiple-choice questions, with the correct option and why. 1. How is the blend of action and art videos modelled? A. Video generalization marked {overlapping} B. Disjoint generalization C. Aggregation D. A separate unrelated class Answer: A. {overlapping} allows a video to be both ActionVideo and ArtVideo. (Key point: Overlapping generalization) 2. How are random, regular and club-member customers modelled? A. Customer generalized into RandomCustomer, RegularCustomer and ClubMember ({disjoint}), with name in Customer B. Three unrelated classes C. Rental generalized into customers D. Customer has a part Video Answer: A. Shared name is in the superclass; cumulative rentals and member address in subclasses. (Key point: Customer hierarchy) 3. Where are date, copies, lease time and purchase price recorded? A. In the Agreement class between Partner (importer or chain trade) and Video B. In Customer C. In Rental D. In ArtVideo Answer: A. Each acquisition agreement links a Partner to one or more Videos. (Key point: Agreement placement) 4. How is the rental price derived? A. From the rental period, purchase price and customer relationship B. From the video name only C. Fixed for all videos D. From the importer's bank details Answer: A. Rental relates a Customer (1 to many) to Videos, and customer type gives the discount. 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