CSC307 Lecture 12

Introduction to Software Engineering
Decorator and Composite
(202602)

Transcript

1. Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.info o ffi ce: 14 -227 CSC 307 Introduction to Software Engineering Lecture 12. Patterns II
2. GoF Patterns 2
3. Singleton 3
4. Observer 4
5. Decorator Composite
6. Decorator | Composite 6
7. Decorator | Composite 7
8. Problem 8
9. Inheritance Approach 9
10. Inheritance Approach 10
11. Inheritance Approach 11
12. Decorator vs Inheritance • Both a llow you to ch a nge how a n object beh a ves. • The decor a tor p a ttern a llows you to extend (decor a te) the function a lity of a n object a t runtime. • Inherit a nce a dds beh a vior a t compil a tion time. 12
13. Decorator | Composite 13
14. Decorator | Composite 14
15. Decorator 15
16. Composite 16
17. Example 17
18. Component abstract class Component { public abstract void operation(); } 18 https://github.com/CSC3100/Patterns
19. ConcreteComponent | Ball 19 https://github.com/CSC3100/Patterns
20. Decorator abstract class Decorator extends Component { protected Component component; public void setComponent(Component component) { this.component = component; } @override public void operation() { if (component != null) { component.operation(); } } } 20 https://github.com/CSC3100/Patterns
21. ConcreteDecoratorOne | Bag 21 https://github.com/CSC3100/Patterns
22. ConcreteDecoratorTwo | Box 22 https://github.com/CSC3100/Patterns
23. Main 23 dr a w dr a w dr a w https://github.com/CSC3100/Patterns
24. Composite | Example 24 dr a w
25. Decorator vs Inheritance • Both a llow you to ch a nge how a n object beh a ves. • The decor a tor p a ttern a llows you to extend (decor a te) the function a lity of a n object a t runtime. • Inherit a nce a dds beh a vior a t compil a tion time. 25
26. Homework 26 Reading https://medium.com/javarevisited/software-design-patterns-decorator-in-a-nutshell-eefd2025ea3c
27. Connecting the Dots
28. Application 28
29. Application | GUI 29 Main JFrame ChartPanel JPanel
30. Application | Data Gathering 30 Main JFrame ChartPanel Thread Genius JPanel
31. Application | Observer 31 Main JFrame ChartPanel Thread <<Singleton>> Board Genius JPanel PropertyChange Listener PropertyChange Support
32. MarkerDecoratorShadow MarkerDecoratorDot MarkerSimple Application | Decorator 32 MarkerDecoratorDot MarkerSimple MarkerSimple
33. Main 33 https://github.com/CSC3100/Patterns ChallengePlotter
34. Genius | Runnable 34 https://github.com/CSC3100/Patterns
35. Board | Singleton, Observable 35 https://github.com/CSC3100/Patterns
36. ChartPanel | Observer 36 https://github.com/CSC3100/Patterns
37. Marker | Decorator 37 https://github.com/CSC3100/Patterns
38. MarkerDecorator | Decorator 38 https://github.com/CSC3100/Patterns
39. MarkerDecoratorBar | Decorator 39 https://github.com/CSC3100/Patterns
40. MarkerDecoratorDot | Decorator 40 https://github.com/CSC3100/Patterns
41. MarkerSimple | Decorator 41 https://github.com/CSC3100/Patterns
42. Note 42 UML Class Diagram
43. Questions 43
44. Lab.
45. CSC 307 Introduction to Software Engineering Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu 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.