Java Interview Questions and Answers for Experienced | Core Java, Java 8, Spring Boot, SQL

Get ready to crack your Java interview in 2025 with real, high-impact Java interview questions and answers sourced from the most searched and top-ranked interview topics on YouTube. This video is designed for freshers, experienced Java developers, backend engineers, and Spring Boot professionals preparing for product-based and service-based company interviews.

📌 Video Chapters / Timestamps
0:00 Introduction & Interview Structure
1:42 Core Java Concepts (Method Hiding, Edge Cases)
3:42 Coding Problem: Max Vowels in a String (Java 7)
13:28 Java Edge Cases (double.MIN_VALUE, null in Set)
14:26 Garbage Collection Explained
17:00 Static Methods & Interfaces
18:22 HashMap Internal Working
22:58 SOLID Principles Overview
23:07 SOLID Principles Explained (SRP, OCP, LSP, ISP, DIP)
27:00 Java 8 Features Overview
27:11 Java 8 Core Features (Lambda, Streams, Optional, Date-Time)
29:17 Default & Static Methods in Interfaces
30:01 Stream Intermediate Operations
30:39 HTTP Status Codes (204 Explained)
30:56 Microservices Architecture in Project
31:45 Logging & Monitoring Tools
32:30 JWT Authentication in Project
34:54 JWT Flow & Token Lifespan
36:16 Refresh Token Implementation
37:31 Third-Party API Integration
38:53 Spring Boot Core Annotations (@Lazy, @Component)
40:57 Component Scanning & Exception Handling
42:22 JPA & Bean Scopes
43:56 RequestParam vs PathVariable vs RequestBody
45:06 @GeneratedValue & SQL Interview Questions

🔗 Source Code
https://github.com/MJBackendBootCamp/Java_Interview_Questions_Real_Time

🔗 Subscribe (Java + Backend Content)
https://www.youtube.com/@MJBackend?sub_confirmation=1

🔥 Covered Topics from Top-Ranking Search Terms

• Java interview questions and answers
• Core Java interview questions and answers (experienced & freshers)
• Java 8 interview questions, Java 8 features & Java 8 coding interview questions
• Spring Boot interview questions and answers
• Java Spring Boot interview & Spring Boot interview questions for experienced
• Java collections interview questions & collection framework in Java interview questions
• SQL interview questions and answers & database interview questions
• Java interview questions for 3 years experience
• Java backend interview questions & Java developer interview questions
• Java full stack interview questions and answers
• Java microservices interview questions & Spring Boot microservices interview questions
• Design patterns in Java (Singleton Design Pattern)
• Concurrency in Java, multithreading, HashMap, exception handling
• Pattern program in Java
• Spring Data JPA interview questions
• JPA / Hibernate (LAZY vs EAGER loading)

✅ What You’ll Learn

Core Java (Most searched keywords)
• OOP concepts
• Collections Framework
• Concurrency in Java
• JVM memory model
• Exception handling

Java 8 (High-ranking search terms)
• Streams
• Lambdas
• Optional
• Functional Interfaces
• Default methods

Spring Boot (Top SEO topic)
• REST APIs
• Dependency Injection
• Bean scopes
• HTTP status codes handling
• Auto-configuration

JPA / Hibernate
• Entities & repositories
• Relationships (OneToMany, ManyToOne, etc.)
• LAZY vs EAGER fetching
• Transactions & persistence context

SQL for Java Developers
• Joins
• Indexing
• Normalization
• ACID transactions

Plus
• Real interview-style coding & theory questions
• Scenario-based interview problems
• Bonus: Singleton Design Pattern deep dive

🔗 Quick Links

HTTP Status Codes in Spring Boot:
https://stackabuse.com/how-to-return-http-status-codes-in-a-spring-boot-application/

Spring Data JPA Guide:
https://spring.io/guides/gs/accessing-data-jpa

Singleton Design Pattern video:
https://youtu.be/hMU7RDeJdpI?si=9R9qcJENf7XUu40f

Injection of Prototype in Singleton:
https://youtu.be/miDsw-XN2IY?si=GNJqaJlPLQ3kSYDj

What Are Microservices (Explained):
https://youtu.be/dRToQt49yeY?si=cpihSj4PoFn9RVmg

📌 Most Ranked & Most Searched Hashtags (2025)
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Видео Java Interview Questions and Answers for Experienced | Core Java, Java 8, Spring Boot, SQL канала MJ's BACKEND BOOTCAMP