Oops design pattern_amitgupta
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Design patterns provide standardized solutions to common programming problems that can be reused in code. There are three main categories of design patterns: creational patterns that create objects, structural patterns that organize relationships between entities, and behavioral patterns that define communication between objects. Some examples included in the document are the singleton pattern to ensure only one instance, the bridge pattern to separate interfaces from implementations, and the observer pattern to notify objects of state changes.
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Oops design pattern_amitgupta
- 2. Agenda • What is Design Pattern? • Types of Design Pattern • Live Example
- 3. Design Pattern Design Patterns provide standardized and efficient solutions to software design and programming problems that are re-usable in your code. Software Architects and developers use them to build high quality robust applications. The authors Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides are often referred to as the GoF, or Gang of Four.
- 4. Types of Design Pattern The GoF Design Patterns are divided into 3 categories : Creational Patterns, Structural Patterns and Behavioral Patterns. • Behavioral patterns describe interactions between objects. • Creational patterns are used to create objects for a suitable class that serves as a solution for a problem. • Structural patterns form larger structures from individual parts, generally of different classes.
- 5. Creational Patterns Abstract Factory Pattern: Create instances of classes belonging to different families Builder Pattern: Separate representation and object construction Factory Method Pattern: Create instances of derived classes Prototype Pattern: Clone or copy initialized instances Singleton Pattern: Class with only one single possible instance
- 6. Structural Patterns Adapter Pattern: Match interfaces of classes with different interfaces Bridge Pattern:: Separate implementation and object interfaces Composite: Simple and composite objects tree Decorator: Dynamically add responsibilities to objects Facade: Class that represents subclasses and subsystems Flyweight: Minimize memory usage by sharing as much data as possible with similar objects Proxy: Object that represents another object
- 7. Behavioral Patterns Chain of Responsibility: Pass requests between command and processing objects within a chain of objects Command: Encapsulate a method call as an object containing all necessary information Interpreter: Include language elements and evaluate sentences in a given language Iterator: Give sequential access to elements in a collection Mediator: Encapsulates and simplifies communication between objects
- 8. Behavioral Patterns continue.. Memento: Undo modifications and restore an object to its initial state Observer: Notify dependent objects of state changes State: Change object behavior depending on its state Strategy: Encapsulate algorithms within a class and make them interchangeable Template Method: Define an algorithm skeleton and delegate algorithm steps to subclasses so that they may be overridden Visitor: Add new operations to classes without modifying them
- 9. Thank you