Algorithms and Data Structures in Java. Basic Course

The book "Algorithms and Data Structures in Java" is a practical guide that will help you master fundamental programming concepts and learn to write efficient, fast, and scalable code in Java. Whether you are preparing for a technical interview at a major IT company or want to deepen your knowledge in software development, this book will be your reliable companion.

What is this book about?

The author consistently guides the reader from simple concepts to complex algorithmic problems. You will start with the basics: what arrays, lists, and recursion are, and then move on to advanced topics such as:

• Sorting and Searching: bubble sort, quicksort, merge sort, binary search, and their implementation in Java.
• Data Structures: stacks, queues, hash tables, linked lists, trees (AVL, red-black), and graphs.
• Graph Algorithms: depth-first search (DFS) and breadth-first search (BFS), Dijkstra's, Prim's, and Kruskal's algorithms.
• Dynamic Programming: analysis of classic problems (knapsack, Levenshtein distance) and their solution patterns.
• Code Optimization: complexity analysis (Big O), memory management, profiling, and refactoring.

Who is this book for?

This book will be useful for:

• Beginner Java developers who want to systematize their knowledge and learn to write code that doesn't "lag."
• Technical students studying programming and preparing for exams or hackathons.
• Experienced programmers transitioning to Java from other languages (Python, C++, C#) and wanting to quickly learn local idioms and best practices.
• Candidates for Junior/Middle positions preparing for interviews and wanting to confidently solve algorithmic problems.

What will you learn after reading?

• How to choose the right data structure for a specific task without making mistakes.
• How to estimate the time and space complexity of algorithms "by eye."
• How to implement standard sorting and searching algorithms without errors.
• How to work with trees and graphs — from theory to ready-to-use code.
• How to apply dynamic programming patterns to solve complex problems.

Each chapter contains Java code examples that can be run immediately in any development environment. At the end of the sections, there are exercises for independent work — this will help reinforce the material and prepare for real projects.

The book is written in simple and clear language, without excessive academicism. All complex topics are broken down into small steps, accompanied by clear diagrams and code comments. You will not just read the theory — you will learn to apply algorithms in practice.

"Algorithms and Data Structures in Java" is an investment in your professional future. By mastering the material in this book, you will be able to solve problems of any complexity and become a more sought-after specialist in the job market.