CSC305 Lecture 11

Individual Software Design and Development
Patterns
(202510)

Transcript

1. Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info o ffi ce: 14 -227 CSC 305 Individual Software Design and Development Lecture 11. Patterns
2. ✅ Dependencies + Architecture ✅ GUI + Multithreading ✅ Object-Oriented Programming Week 06 2 ✅ Clean Code ✅ Object-Oriented Design
3. Running code isn’t enough — design matters This class is about design, not just programming.Being able to compile and run your code is necessary but not sufficient — the focus should be on demonstrating clear design, quality, and adherence to standards.
5. GitHubViz 2.0 5 Size control is managed through the alpha value: with zero lines the display is fully transparent, and as the number of lines increases toward the maximum, the color becomes darker. Complexity is represented by color, determined by the total number of conditional or loop statements (if, switch, while, for). When this total exceeds ten, the color is red; when it is greater than five, the color is yellow; otherwise, it is green.
6. UML Cl a ss Di a gr a m
7. Standard Solutions Patterns
8. 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). 8
9. GoF Patterns 9
10. Singleton Pattern
11. Singleton 11
12. Singleton class MainApp { public static void Main(String []a){ Singleton s1 = Singleton.getInstance(); Singleton s2 = Singleton.getInstance(); // Test for same instance if (s1 == s2){ // true - Objects are the same instance } } } 12
13. Singleton class Singleton{ private static Singleton _instance; private Singleton() {} public static Singleton getInstance(){ if (_instance == null){ _instance = new Singleton(); } return _instance; } } 13
14. Observer Patterns
15. Observer 15
16. Classroom | Initial Version 16 https://github.com/CSC3100/Patterns
17. Student | Initial Version 17 https://github.com/CSC3100/Patterns
18. Teacher | Initial Version 18 https://github.com/CSC3100/Patterns
19. Main
20. Observer 20 https://github.com/CSC3100/Patterns
21. Observable 21 https://github.com/CSC3100/Patterns
22. Classroom | New Version 22 https://github.com/CSC3100/Patterns
23. Student | New Version 23 https://github.com/CSC3100/Patterns
24. Teacher | New Version 24 https://github.com/CSC3100/Patterns
25. Important 25 Do not reinvent the wheel! (Do not make another implementation for classes Observer or Observable -they already exist in libraries!)
26. Important 26 Depreciated java.util.Observer java.util.Observable The implementation of these packages That is NOT about the Observer pattern being depreciated.
27. Important 27 Use java.beans.PropertyChangeListener java.beans.PropertyChangeSupport
28. Classroom | Listener Version 28 https://github.com/CSC3100/Patterns
29. Student | Listener Version 29 https://github.com/CSC3100/Patterns
30. Teacher | Listener Version 30 https://github.com/CSC3100/Patterns
31. Thoughts? 31
32. Problem
33. Problem 33
34. Main 34
35. DataSource 35
36. Panel 36
37. Blackboard 37
38. Questions 38
39. Lab
40. Problem 40
41. CSC 305 Individual Software Design and Development Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Fall 2025 Copyright. These slides can only be used as study material for the class CSC305 at Cal Poly. They cannot be distributed or used for another purpose.