Question

DUE IN TWO HOURS

ASAP PLEASE!!!

Given the following specification, design a class diagram using PlantUML. To design the class diagram, use abstract (10 points), static (10 points), package (20 points ), namespace (20 points ), association (20 points ), and generalization (20 points ) on PlantUML

Specification:

• A school has a principal, many students, and many teachers. Each of these persons has a name, birthdate, and may borrow and return books. The book class must contain a title, abstract, and when it is available. Teachers and the principal are both paid a salary.
• A school has many playgrounds and rooms. A playground has many swings. Each room has many chairs and doors. Rooms include offices, restrooms, classrooms, and a cafeteria. Each classroom has many computers and desks. Each desk has many rulers.  

Submit a DOC/PDF file including PlantUML script and diagram.

Answer 1

ANSWER:

Class diagram describes the attributes and operations of a class and also the constraints imposed on the system. The class diagrams are widely used in the modeling of object oriented systems because they are the only UML diagrams, which can be mapped directly with object-oriented languages.

We can classify the above specifications into two broader categories.
1. Defining members of school
2. Defining infrastructure of school.
We have defined these broader classification as different packages. Memebrs and Infrastructure

Members:
We can have 3 types of person : Principal, Teachers, Students (Generalisation)
Each person class have name and birthdate. These holds true for all three specific types hence these are properties of superclass.
However only Teacher and Principal have specific attribute - salary.
Person can borrow books. (1 person can borrow many books and a single book is borrowed under name of single person at a time hence 1:N association exists here)

Infrastructure:
Consists of:
- Books (that a person can borrow)
Have attributes title and abstract
Is also have methods - isAvailable that checks whether book is available at that point of time
- borrow() and return() to perform borrow and return operation on book.
- PlayGround (1 playground can have many swings depicts a 1 to many association)
- Room (1 room can have many doors and desks 1:N association)
Rooms can be of 4 types : Office, Restroom, ClassRoom, Cafeteria (Categories of room => Generalisation)
- Desk can have many rulers (1:N association)

Below is the code to generate required class diagram on PlantUML

@startuml
School "1" -down-> "1" Members.Principal
School "1" -down-> "N" Members.Student
School "1" -down-> "N" Members.Teacher
School "1" -down-> "N" Infrastructure.PlayGround
School "1" -down-> "N" Infrastructure.Room

package Members {
abstract class Person {
  name
  birthDate
}

class Teacher {
  salary
}
class Principal {
  salary
}
class Student 
Person <|-- Teacher
Person <|-- Student 
Person <|-- Principal

Person "1" - "N" Infrastructure.Books : borrow
}
package Infrastructure {
  class Books {
    title
    abstract
    isAvailable()
    borrow()
    return()
  }
  Playground "1" - "N" Swing : has
  Room "1" -left-> "N" Chair : has
  Room "1" -right-> "N" Door : has
  Room <|-- office
  Room <|-- RestRoom
  Room <|-- ClassRoom
  Room <|-- Cafeteria
  ClassRoom "1" -left-> "N" Computer : has
  ClassRoom "1" -right-> "N" Desk : has
  Desk "1" -down-> "N" Ruler : has
}

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