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Complete Multithreading & Concurrency Guide

Table of Contents

1. Process vs Thread
2. Thread Lifecycle
3. Creating Threads
4. Synchronization Basics
5. Locks vs Synchronized
6. Deadlock

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Association, Aggregation & Composition in Java OOP

Table of Contents

1. Overview
2. Association (Weak Relationship)
3. Aggregation (Has-a, Weak Ownership)
4. Composition (Strong Ownership)
5. Side-by-Side Comparison
6. Interview Decision Rule
7. FAANG-Style Examples

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Comprehensive Guide to Object-Oriented Programming Design in Java

Table of Contents

1. Introduction to OOP
2. The Four Pillars of OOP
   • Encapsulation
   • Inheritance
   • Polymorphism

• Abstraction

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Complete JavaScript Hoisting Guide

Table of Contents

1. What Hoisting Actually Is
2. The Two-Phase Mechanism
3. Hoisting Rules Reference Table
4. Temporal Dead Zone (TDZ)
5. var Hoisting
6. let and const Hoisting

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Complete Java Optional Guide with Best Practices

Table of Contents

1. Optional Basics (Foundation)
2. Creating Optional Instances
3. Checking for Values
4. Retrieving Values
5. Transforming Values (map & flatMap)
6. Filtering Values

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Complete Java Streams Guide with Problems

Table of Contents

1. Stream Basics (Foundation)
2. Creating Streams
3. Intermediate Operations
4. Terminal Operations
5. Collectors (Very Important 🚀)
6. Reduction & Aggregation Patterns

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JavaScript Promises & Event Loop - Tricky Questions

A comprehensive guide to understanding JavaScript promises, async/await, and the event loop through challenging quiz questions.

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#1: Promise Executor Order

console.log('Start');

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Complete Node.js/Express.js Learning Roadmap

Table of Contents

1. JavaScript Foundations (Must-Have)
   • Modern JavaScript (ES6+)
   • Asynchronous JavaScript
   • Object-Oriented & Functional Concepts
2. Node.js Fundamentals

• Core Concepts

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Complete Spring Boot Learning Roadmap

Table of Contents

1. Java Foundations (Must-Have)
   • Core Java
   • Collections & Generics
   • Concurrency
2. Spring Core (Very Important)

• Core Concepts

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Complete Interview Questions Guide

A comprehensive collection of interview questions for Java, Spring Boot, SQL, System Design, and Low-Level Design

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Table of Contents

1. Core Java

• 1.1 OOP & Basics