Java Interview: 200 Questions and Answers

The book "Java Interview: 200 Questions and Answers" is a practical guide for developers preparing for a technical interview. It covers all the key topics tested in interviews at IT companies: from the basics of the language to advanced concepts of multithreading, JVM, and frameworks.

The book contains real questions asked in interviews at Russian and international companies. Each question is accompanied by a detailed answer with explanations, code examples, and references to best practices. The author has structured the material so that the reader can quickly find the desired topic and review it before the interview.

Who this book is for:

• Junior Java developers preparing for their first interview
• Middle-level specialists wanting to systematize knowledge and fill gaps
• Developers from other languages transitioning to Java
• Students and course graduates planning employment

What you will learn:

• Core questions on Java syntax, OOP, collections, and exceptions
• In-depth analysis of multithreading: synchronized, Lock, ExecutorService, CompletableFuture
• JVM internals: garbage collection, reference types, memory settings
• Design patterns: Singleton, Factory, Builder, Observer — with examples in Java
• Spring Boot and Spring Data: DI, AOP, transactions, configuration
• SQL and NoSQL: JOIN, indexes, transactions, Hibernate
• Algorithms and data structures: sorting, trees, hash tables, graphs
• Tips on interview behavior and solving problems in real time

The book is written in simple and clear language, without unnecessary theory. Each section ends with a brief summary and additional questions for self-assessment. The author is a practicing Java developer with experience conducting technical interviews, so the material is as close to real conditions as possible.

"Java Interview: 200 Questions and Answers" will be your reliable assistant on the path to an offer from an IT company. Read, review, and confidently pass your interviews!