Question

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

Specification:

• A school has a principal, many students, and many teachers. Each of these persons has a name, birth date, 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.  

Answer 1

Answer:

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

}

The Class diagram describes the attributes and also operations of a class and constraints inflict on the system.

The class diagrams are extensively used in the modeling because they are the only UML diagrams, which can be mapped directly with object-oriented languages.

Given, specifications into two broader categories.
Defining both members of school and infrastructure of school.
We have defined these broader classification as different packages. Members and Infrastructure
Given, 3 types of person : Principal, Teachers, Many Students
Each person class have name and birthdate. These holds true for all three specific types hence these are properties of superclass.
The 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 ( Each of these persons has a name, birth date, and may borrow and return books)
Have attributes title and abstract ,Desk can have many rulers (1:N association)
Methods – is Available that checks whether book is available at that point of time
borrow() and return() to perform borrow and return operation on book.
Play Ground (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, Class Room,