CSC308B Lecture 13

Software Engineering I
Connecting the Dots
(202401) - two-days per week version

Transcript

1. jgs CSC 308 Software Engineering 1 Lecture 13: Connecting the Dots Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.com Building 14 -227
2. jgs Previously…
3. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 3 Scenario Observer + update() Observable + addObserver() + notifyObservers() + setChanged() Teacher Student Main
4. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 4 NumberGenerator.java
5. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 5 Screen.java
6. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 6 Main.java
7. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 7 Singleton
8. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 8 class MainApp { public static void Main(String []a){ // Constructor is protected -- cannot use new Singleton s1 = Singleton.getInstance(); Singleton s2 = Singleton.getInstance(); // Test for same instance if (s1 == s2){ // true - Objects are the same instance } } } Singleton
9. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 9 class Singleton{ private static Singleton _instance; // Constructor is 'protected' protected Singleton() {} public static Singleton getInstance(){ if (_instance == null){ _instance = new Singleton(); } return _instance; } } Singleton
10. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 10 Decorator
11. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 11 abstract class Component { public abstract void operation(); } Component
12. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 12 class ConcreteComponent extends Component { @override public void operation() { System.out.print("ConcreteComponent-Operation()"); } } ConcreteComponent
13. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 13 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(); } } } Decorator
14. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 14 class ConcreteDecoratorA extends Decorator { @override public void operation() { super.operation(); System.out.println("ConcreteDecoratorA-Operation()”); } } ConcreteDecoratorA
15. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 15 class ConcreteDecoratorB extends Decorator { @override public void operation() { super.operation(); addedBehavior(); System.out.println("ConcreteDecoratorB-Operation()"); } void addedBehavior() { } } ConcreteDecoratorB
16. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 16 class MainApp { static void main() { // Create ConcreteComponent and two Decorators ConcreteComponent c = new ConcreteComponent(); ConcreteDecoratorA d1 = new ConcreteDecoratorA(); ConcreteDecoratorB d2 = new ConcreteDecoratorB(); // Link decorators d1.SetComponent(c); d2.SetComponent(d1); d2.Operation(); } } Main
17. jgs Connecting Dots Connecting all
18. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 18
19. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 19 Repository Panel BoxGenerator Main Box
20. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 20 Main.java
21. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 21 Repository.java / / Observable
22. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 22 Screen.java
23. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 23 BoxGenerator.java
24. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 24 Box.java
25. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 25 Next
26. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 26
27. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 42 Questions
28. jgs
29. jgs CSC 308 Software Engineering 1 Lab 11: Project Sprint 2 (Continue) Dr. Javier Gonzalez-Sanchez javiergs@calpoly.edu www.javiergs.com Building 14 -227 Office Hours: By appointment
30. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 46 Scenario (1) Repository is a Singleton It stores the information for Squares and circles objects (2) A CircleBuilder is a Runnable Creating circles 1 per second At random places (3) A BoxBuilder is a Runnable Creating boxes 1 per second At random places (4) A Screen is a Panel Drawing the circles and boxes observed in the Whiteboard (5) And we need a Main that assembly everything and provide a Frame
31. jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 47 Let’s Work
32. jgs CSC 308 Software Engineering I Javier Gonzalez-Sanchez, Ph.D. javiergs@calpoly.edu Winter 2024 Copyright. These slides can only be used as study material for the class CSC 308 at Cal Poly. They cannot be distributed or used for another purpose.