CSE360 Tutorial 05

Introduction to Software Engineering
The SOLID Principles II
(202206)

Transcript

1. CSE360
   Introduction to Software Engineering
   Lecture:
   The SOLID Principles II
   Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu
   Office Hours: By appointment
   

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2. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 2
   Announcement
   • Monday, June 20
   

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3. Previously …
   

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4. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 4
   Design Principles
   There are five key design principles to consider in
   Object-Oriented:
   • Single Responsibility Principle (SRP)
   • Open-Closed Principle (OCP)
   • Liskov Substitution Principle (LSP)
   • Interface Segregation Principle (ISP)
   • Dependency Inversion Principle (DIP)
   

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5. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 5
   Single Responsibility Example
   

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6. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 6
   Open-Close Example
   

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7. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 7
   Liskov Substitution
   • Imagine you already have a class Circle, and you are asked
   to create a class Cylinder.
   • Or maybe you have a class Rectangle, and you are asked to
   create a class Square (a square is a rectangle with the same
   width and height).
   • Or you have a class LinkedList, and you are asked to create a
   class PersistentLinkedList (one that writes out its elements to a
   stream and can read them back later).
   If you are tempted to use inheritance from Circle to Cylinder, or
   from Rectangle to Square, or
   from LinkedList to PersistentLinkedList, i.e., create a parent-child
   relationship for any of these cases, you will have problems.
   

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8. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 8
   Interface Segregation
   • Clients should not be forced to depend on methods
   that they do not use.
   • ISP deals with the disadvantage of “fat” interfaces
   (or abstract classes).
   • ISP recommends to broke up interfaces with a lot of
   methods into several interfaces.
   

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9. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 9
   Dependency Inversion Example
   

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10. Connecting the Dots
    SOLID Principles
    

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11. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 11
    Project – User create dots
    

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12. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 12
    Project – User selects Cluster and clicks Run
    ✅
    

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13. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 13
    Project – User selects Cluster and clicks Run
    ✅
    

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14. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 14
    Project – User selects Line and clicks Run
    ✅
    

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15. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 15
    Project – User selects Line and clicks Run
    ✅
    

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16. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 16
    Connecting the Dots
    

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17. CSE360 – Introduction to Software Engineering
    Javier Gonzalez-Sanchez
    javiergs@asu.edu
    Summer 2022
    Disclaimer. These slides can only be used as study material for the class CSE360 at ASU. They cannot be distributed or used for another purpose.
    

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