Singleton Design Pattern in 30 Minutes Overview of Design Patterns in Hindi

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In this video, we begin with a brief overview of the main types of design patterns, which are crucial for structuring your code effectively: • Creational Patterns: These patterns focus on the process of object creation, offering solutions to instantiate objects in a way that's suited to the situation. Examples include Singleton, Factory Method, Abstract Factory, Builder, and Prototype patterns. • Structural Patterns: These patterns are concerned with how classes and objects are composed to form larger structures. Examples include Adapter, Bridge, Composite, Decorator, Facade, Flyweight, and Proxy patterns. • Behavioral Patterns: These patterns deal with how objects collaborate and handle responsibilities. Examples include Strategy, Observer, Command, Iterator, Mediator, State, Visitor, and Template Method patterns. • After understanding the different categories, we dive into one of the most commonly used design patterns: the Singleton Design Pattern in Java. • We’ll explain why a public constructor isn't effective for a Singleton and how using a private constructor with a static getInstance method helps ensure that only one instance of the class exists throughout the application. • However, multi-threaded environments introduce challenges. Using the synchronized keyword to manage access to the critical section can prevent multiple threads from accessing it simultaneously, but this approach can significantly slow down the system—by as much as 100 times! • To overcome these challenges, we’ll explore: • Eager Initialization: A technique that initializes the Singleton instance at application startup, solving thread safety issues but potentially impacting the startup time. • Double-Checked Locking with volatile: A more efficient method that involves using a null check within a synchronized block and marking the instance variable as volatile. This reduces unnecessary locking while ensuring thread safety. • By the end of this video, you’ll not only master the Singleton pattern but also have a better understanding of the various design pattern categories and their importance in software development. • 00:00 Introduction to design pattern • 01:36 Singleton pattern introduction • 02:09: Why do we want to make it singleton • 03:36 Singleton using private constructor and static getInstance method • 08:10 Singleton in multithreading env using synchronized • 10:14 Singleton using eager loading • 11:55 Double null check with synchronized and volatile • 14:40 Volatile importance in multithreading environment. • 25:53 static vs volatile • • #JavaProgramming #DesignPatterns #SingletonPattern #JavaTutorial #SoftwareDevelopment #ProgrammingTips #CodeDesign #JavaDesignPatterns #OOP #CodingTutorial

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