CSC307 Lecture 11 - Speaker Deck

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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 11. Patterns II

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GoF Patterns 2

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Singleton 3

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Observer 4

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Decorator Composite

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Decorator | Composite 6

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Decorator | Composite 7

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Problem 8

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Inheritance Approach 9

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Inheritance Approach 10

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Inheritance Approach 11

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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

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Decorator | Composite 13

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Decorator | Composite 14

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Decorator 15

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Composite 16

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Example 17

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Component abstract class Component { public abstract void operation(); } 18 https://github.com/CSC3100/Patterns

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ConcreteComponent | Ball 19 https://github.com/CSC3100/Patterns

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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

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ConcreteDecoratorOne | Bag 21 https://github.com/CSC3100/Patterns

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ConcreteDecoratorTwo | Box 22 https://github.com/CSC3100/Patterns

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Main 23 dr a w dr a w dr a w https://github.com/CSC3100/Patterns

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Composite | Example 24 dr a w

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Homework 26 Reading https://medium.com/javarevisited/software-design-patterns-decorator-in-a-nutshell-eefd2025ea3c

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Connecting the Dots

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Application 28

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Application | GUI 29 Main JFrame ChartPanel JPanel

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Application | Data Gathering 30 Main JFrame ChartPanel Thread Genius JPanel

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Application | Observer 31 Main JFrame ChartPanel Thread <> Board Genius JPanel PropertyChange Listener PropertyChange Support

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MarkerDecoratorShadow MarkerDecoratorDot MarkerSimple Application | Decorator 32 MarkerDecoratorDot MarkerSimple MarkerSimple

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Main 33 https://github.com/CSC3100/Patterns

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Genius | Runnable 34 https://github.com/CSC3100/Patterns

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Board | Singleton, Observable 35 https://github.com/CSC3100/Patterns

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ChartPanel | Observer 36 https://github.com/CSC3100/Patterns

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Marker | Decorator 37 https://github.com/CSC3100/Patterns

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MarkerDecorator | Decorator 38 https://github.com/CSC3100/Patterns

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MarkerDecoratorBar | Decorator 39 https://github.com/CSC3100/Patterns

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MarkerDecoratorDot | Decorator 40 https://github.com/CSC3100/Patterns

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MarkerSimple | Decorator 41 https://github.com/CSC3100/Patterns

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Note 42 UML Class Diagram

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Questions 43

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Lab.

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To Do 45 Compile and Run

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To Do 46 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.