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OOP Concepts in Java

Table of Contents

• Encapsulation
  • What is Encapsulation?
  • Access Modifiers
  • Getters, Setters & Validation
  • Immutable Classes
• Best Practices

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Java Records — The Complete Guide

Table of Contents

• What is a Record?
• Basic Syntax
• What the Compiler Generates
• Constructors in Records
  • Canonical Constructor
• Compact Constructor

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Sorting in Java & Comparable vs Comparator

Table of Contents

• How Java Sorting Works Internally
• Sorting Primitives
• Sorting Objects
• Comparable — Natural Ordering
  • What is Comparable?
• Implementing compareTo

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Shallow and Deep Copy in Java

Table of Contents

• Overview
• Shallow Copy
  • What is a Shallow Copy?
  • How to Implement a Shallow Copy
  • Pitfalls of Shallow Copy
• Deep Copy

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2D Grid & Matrix Graph Algorithms in Java — Interview Prep Guide

Table of Contents

1. Grid as a Graph
   • Core Concepts
   • Direction Vectors
   • Bounds Checking & Templates
2. DFS on Grid

• Recursive DFS

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DSA Graphs in Java — Interview Prep Guide

Table of Contents

1. Graph Fundamentals
   • Types of Graphs
   • Representations
2. Depth-First Search (DFS)
   • Recursive DFS

• Iterative DFS

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Liquibase — Interview Prep Guide

Table of Contents

1. What is Liquibase?
2. Core Concepts
   • Changelog
   • Changeset
   • Tracking Tables
3. Changelog Formats

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JPA & Hibernate — Interview Prep Guide

Table of Contents

1. JPA vs Hibernate Overview
2. Architecture & Core Components
3. Entity Lifecycle
4. Persistence Context & EntityManager
5. Mappings

• Basic & Embedded

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JVM Internals — Interview Prep Guide

Table of Contents

1. JVM Overview
2. Class Loading Subsystem
3. Runtime Data Areas (Memory Model)
   • Method Area / Metaspace
   • Heap

• Stack (JVM Stack)

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📦 Java Collections — Interview Master Guide

Complete Interview Preparation | Theory + Internals + Code + Most Asked Questions

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Table of Contents

1. Collections Framework Overview
2. Collection Hierarchy