CSE360 Tutorial 07

Introduction to Software Engineering
Singleton
(202206)

Transcript

1. CSE360
   Introduction to Software Engineering
   Lecture:
   Singleton
   Javier Gonzalez-Sanchez
   javiergs@asu.edu
   javiergs.engineering.asu.edu
   Office Hours: By appointment
   

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2. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 2
   Project 02
   • User can draw dots on the Screen
   • User select Cluster or Line Box
   • User click the “Run” button
   • Computer Calculate either
   o A line that connect all dots using the
   “nearest neighbor” algorithm
   o Divide the dots in TWO groups (clusters). Some dots became
   red, and others became blue –team Blue and team Red
   • Show results on the screen
   

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3. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 3
   Second Draft
   

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4. Singleton
   

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5. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 5
   GoF Patterns
   Creational Patterns
   • Abstract Factory
   • Builder
   • Factory Method
   • Prototype
   • Singleton
   Structural Patterns
   • Adapter
   • Bridge
   • Composite
   • Decorator
   • Façade
   • Flyweight
   • Proxy
   Behavioral Patterns
   • Chain of Responsibility
   • Command
   • Interpreter
   • Iterator
   • Mediator
   • Memento
   • Observer
   • State
   • Strategy
   • Template Method
   • Visitor
   

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6. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 6
   Singleton
   

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7. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 7
   Singleton
   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
   }
   }
   }
   

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8. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 8
   Singleton
   class Singleton{
   private static Singleton _instance;
   // Constructor is 'protected'
   private Singleton() {}
   public static Singleton getInstance(){
   if (_instance == null){
   _instance = new Singleton();
   }
   return _instance;
   }
   }
   

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9. Connecting the Dots
   SOLID Principles
   

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10. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 10
    Connecting the Dots
    

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11. Javier Gonzalez-Sanchez | CSE360 | Summer 2018 | 11
    Homework
    • Draft of Project 02 is due Monday before our
    lecture.
    • The midterm exam will be Tuesday instead of
    Monday.
    • The final version of Project 02 is due Monday
    midnight. I will answer questions during the lecture
    on Monday.
    • A correct solution is not only a solution that
    “compiles and runs”; but a solution that matches
    the design we have agreed on.
    

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12. CSE360 – Introduction to Software Engineering
    Javier Gonzalez-Sanchez
    javiergs@asu.edu
    Summer 2022
    Disclaimer. These slides can only be used as study material for the class CSE360 at ASU. They cannot be distributed or used for another purpose.
    

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