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Design patterns 4 - observer pattern
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Contenu connexe
En vedette
Observer pattern a useful model or approach in programming where we need to handle change requests without much changing in code
Observer pattern
Observer pattern
Samreen Farooq
This is Class 5 on a 6 week course I taught on Software Design Patterns. This course discusses the Observer and Decorator patterns. Class based on "Head First Design Patterns."
Observer and Decorator Pattern
Observer and Decorator Pattern
Jonathan Simon
Observer Pattern
Observer Pattern
Guo Albert
Js design patterns
Js design patterns
Grzegorz Wilczynski
Observer pattern
Observer pattern
Observer pattern
Shakil Ahmed
The Observer Pattern (Definition using UML)
The Observer Pattern (Definition using UML)
The Observer Pattern (Definition using UML)
John Ortiz
Refers: Head First Design Pattern.
Design Pattern - 2. Observer
Design Pattern - 2. Observer
Francesco Ierna
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Design patterns
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Observer pattern, delegate, event, lambda expression
Observer pattern, delegate, event, lambda expression
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Presentation on Observer Pattern using some java code
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Observer Pattern
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Observer & singleton pattern
babak danyal
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Observer pattern
Observer pattern
Somenath Mukhopadhyay
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Design Patterns
Srikrishnan Suresh
1. Factory Method Pattern Shahriar Iqbal Chowdhury & Monjurul Habib Code Name: Remington http://www.facebook.com/groups/netter/ 2. Why We need Factory? Caveman Example 3. The Solution 4. A specialist for the job 5. Factory Pattern Method Basics• Creational Pattern• Which object to create• It lets a class defer instantiation to subclasses.• Absolutely all constructors should be private or protected• Also known as Virtual Constructor. 6. When to consider?• When we have a class that implements an interface but not sure which object, which concrete instantiation / implementation need to return.• When we need to separate instantiation from the representation.• When we have lots of select and switch statements for deciding which concrete class to create and return. 7. Factory SaysDefine an interface for creating an object, but let subclasses decide which class to instantiate 8. Problem without Factory Method Pattern 9. Solution Applying Factory Method Pattern 10. Banking Account Management System 11. Object is created based onconfiguration parameters 12. Violation of OCP(Open ClosePrinciple of SOLID) 13. we will need to create a property that indicates type in each account class
Factory Pattern
Factory Pattern
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Eliah Nikans
Reflective portfolio for Master of Education (Teacher Librarianship)
Reflective portfolio
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jobbo1
Observer design pattern
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Observer design pattern
Yenifer Castrillon
This presentation provide information to understand observer design pattern, it’s structure and it’s implementation. I have tried my best to explain the concept in very simple language. The programming language used for implementation is c#. But any one from different programming background can easily understand the implementation.
Observer design pattern
Observer design pattern
Sameer Rathoud
Factory, Singleton, Observer
Design pattern - Software Engineering
Design pattern - Software Engineering
Nadimozzaman Pappo
Colombo Architecture Meetup - Enterprise Architectural Challenges in Large En...
Colombo Architecture Meetup - Enterprise Architectural Challenges in Large En...
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En vedette
(20)
Observer pattern
Observer pattern
Observer and Decorator Pattern
Observer and Decorator Pattern
Observer Pattern
Observer Pattern
Js design patterns
Js design patterns
Observer pattern
Observer pattern
The Observer Pattern (Definition using UML)
The Observer Pattern (Definition using UML)
Design Pattern - 2. Observer
Design Pattern - 2. Observer
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Observer pattern, delegate, event, lambda expression
Observer pattern, delegate, event, lambda expression
Observer Pattern
Observer Pattern
Observer & singleton pattern
Observer & singleton pattern
Observer pattern
Observer pattern
Design Patterns
Design Patterns
Factory Pattern
Factory Pattern
Design Patterns in Cocoa Touch
Design Patterns in Cocoa Touch
Reflective portfolio
Reflective portfolio
Observer design pattern
Observer design pattern
Observer design pattern
Observer design pattern
Design pattern - Software Engineering
Design pattern - Software Engineering
Colombo Architecture Meetup - Enterprise Architectural Challenges in Large En...
Colombo Architecture Meetup - Enterprise Architectural Challenges in Large En...
Design patterns 4 - observer pattern
1.
4. Observer Pattern
2.
3.
Today’s Example
4.
5.
Keep a copy
of the related objects
6.
7.
Observers in Action
8.
Observers in Action
9.
Observers in Action
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