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Dr. Javier Gonzalez-Sanchez [email protected] www.javiergs.info o ffi ce: 14 -227 CSC 307 Introduction to Software Engineering Lecture 10. Patterns

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Technical Debt 2

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Previously

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Relationships 4

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Standard Solutions

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De f inition • Design patterns a re solutions to softw a re design problems you f ind a g a in a nd a g a in in re a l-world a pplic a tion development. • P a tterns a re a bout reusable designs a nd inter a ctions between objects. • The 23 G a ng of Four (GoF) patterns a re gener a lly considered the found a tion for a ll other p a tterns (G a mm a , Helm, Johnson, a nd Vlissides). 6

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GoF Patterns 7

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Singleton

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Singleton 9

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Singleton class Singleton{ private static Singleton _instance; // Constructor is 'protected' protected Singleton() {} public static Singleton getInstance(){ if (_instance == null){ _instance = new Singleton(); } return _instance; } } 10 https://github.com/CSC3100/Patterns

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Singleton 11 https://github.com/CSC3100/Patterns

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Warning 12 Do not Abuse of the Singleton You are transforming OOP into Structural Programming!! 🙈

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Homework 13 Reading https://medium.com/javarevisited/design-patterns-101-hello-singleton-2d3f227c7729

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Observer

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Observer 15

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Classroom | Initial Version 16 https://github.com/CSC3100/Patterns

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Student | Initial Version 17 https://github.com/CSC3100/Patterns

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Teacher | Initial Version 18 https://github.com/CSC3100/Patterns

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Observer 19

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Observer 20 https://github.com/CSC3100/Patterns

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Observable 21 https://github.com/CSC3100/Patterns

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Classroom | New Version 22 https://github.com/CSC3100/Patterns

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Student | New Version 23 https://github.com/CSC3100/Patterns

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Teacher | New Version 24 https://github.com/CSC3100/Patterns

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Important 25 Do not reinvent the wheel! (Do not make another implementation for classes Observer or Observable -they already exist in libraries!)

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Important 26 Depreciated java.util.Observer java.util.Observable The implementation of these packages That is NOT about the Observer pattern being depreciated.

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Important 27 Use java.beans.PropertyChangeListener java.beans.PropertyChangeSupport

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Classroom | Listener Version 28 https://github.com/CSC3100/Patterns

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Student | Listener Version 29 https://github.com/CSC3100/Patterns

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Teacher | Listener Version 30 https://github.com/CSC3100/Patterns

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Thoughts? 31

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Homework 32 Reading https://medium.com/swlh/software-design-patterns-why-what-and-an-example-8d4c0934a6ca

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Questions 33

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Lab.

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To Do 35 We need a Tool

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Tools We need a Tool

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astah.net 37 https://astah.net/products/students/

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File | New (projet) 38

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Create Diagram | Class Diagram 39

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Tools For the rest of this course Do your Class Diagrams in

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To Do 41 Create a Class Diagram

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CSC 307 Introduction to Software Engineering Javier Gonzalez-Sanchez, Ph.D. [email protected] Winter 2026 Copyright. These slides can only be used as study material for the class CSC307 at Cal Poly. They cannot be distributed or used for another purpose.