Java, Data Structures & Algorithms (DSA), Spring, Spring Boot, and Hibernate 2025

Welcome to the Java, DSA, Spring, Spring Boot, and Hibernate 2025 repository! This repository contains a collection of Java code from Beginner to Advanced levels, along with explanations of various Data Structures and Algorithms (DSA) concepts, Spring framework, Spring Boot development, Hibernate ORM, and Maven.

The aim of this repository is to provide a comprehensive understanding of Java programming, common DSA problems, Spring framework, Spring Boot development, Hibernate ORM, and Maven, along with solutions and their explanations. Whether you're a beginner or preparing for interviews, you'll find code examples, explanations, and problem-solving strategies for various topics.

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📚 Topics Covered

Java Basics

• Introduction to Java
• Variables, Data Types, Operators
• Conditionals, Loops & Switch Statements
• Functions & Methods (Method Overloading, Recursion)

Arrays and ArrayLists

• Introduction to Arrays & ArrayLists
• Declaring and Initializing Arrays and ArrayLists

Search Algorithms

• Linear Search
• Binary Search
• Binary Search on 2D Arrays

Sorting Algorithms

• Bubble Sort
• Selection Sort
• Insertion Sort
• Cycle Sort

Other Algorithms

• Kadane’s Algorithm (Maximum subarray)
• Boyer-Moore Algorithm (Majority element in an array)

Strings and StringBuilder

• Manipulating Strings
• String Methods
• StringBuilder class and its operations

Recursion

• Understanding Recursion and Recursion Trees
• Recursion Examples

Time and Space Complexity

• Big-O Notation
• Time Complexity Analysis
• Space Complexity Analysis

Bitwise Operators and Number Systems

• Bitwise Operations (AND, OR, XOR, NOT)
• Number Systems (Decimal, Binary, Hexadecimal, Octal)

Maths for DSA

• Prime Numbers, Sieve of Eratosthenes
• GCD, LCM, Modular Arithmetic

Backtracking

• Solving problems using Backtracking
• Examples: N-Queens, Subset Sum, etc.

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💻 Object-Oriented Programming (OOP)

• Classes, Objects, Constructors, and Keywords
• Instance vs. Static variables and methods
• Principles of OOP
  • Inheritance, Polymorphism, Encapsulation, Abstraction
• Additional OOP Concepts
  • Packages, Exception Handling, Lambda Expressions
  • Object Cloning, Generics, Collections Framework

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📦 Data Structures

Stacks

• Stack Implementation using Arrays & Linked Lists

Queues

• Circular Queue, Priority Queue

Linked Lists

• Singly Linked List
• Doubly Linked List
• Circular Singly Linked List
• Circular Doubly Linked List

Hash Tables

• Hash Functions & Collision Resolution Techniques

Trees

• Binary Trees, Traversals (Inorder, Preorder, Postorder)
• AVL Trees, Segment Trees

Heap

• Min-Heap, Max-Heap, Heap Sort

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📂 Advanced Topics

Maven

• Maven Project Setup
• Dependency Management
• Maven Lifecycle and Plugins

Spring Framework

• Introduction to Spring
• Spring Core, Spring MVC
• Dependency Injection, Bean Management
• Spring AOP and Transactions

Spring Boot

• Introduction to Spring Boot
• Creating REST APIs with Spring Boot
• Spring Boot Annotations
• Spring Boot with PostgreSQL

Hibernate

• CRUD Operations using Hibernate
• Mapping Relationships (OneToOne, OneToMany, ManyToOne, ManyToMany)
• Hibernate Caching
• Introduction to HQL
• Get vs Load

StringBuffer

• Difference between String and StringBuffer
• Performance Considerations

File Handling

• Reading and Writing Files in Java
• FileInputStream, FileOutputStream, BufferedReader, BufferedWriter

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📑 Upcoming: DSA Interview Problems

This repository will soon include:

• DSA Interview Questions & Solutions
• Problem-Solving Strategies
• Code Walkthroughs

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🚀 How to Use This Repository

Clone the Repository:

git clone https://github.com/Anirudh1103/Complete-Java-DSA-OOPs-SpringBoot.git