Java Interview Questions | Core Java, Java 8, Collections, Multithreading & Spring Boot

Published: 01 January 1970
on channel: MJ's BACKEND BOOTCAMP

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In this video, you’ll get real Infosys Java interview questions on Core Java, Spring Boot, JPA, and Multithreading, specially tailored for developers with 3–8 years of experience. Whether you’re preparing for your next Infosys technical round or brushing up your backend skills, these high-yield questions with clear explanations will help you stand out.

This session covers the most searched and top-ranked Java interview topics including:

Java interview questions and answers

Spring Boot interview questions

Core Java concepts for experienced developers

Java 8 features & stream operations

Multithreading & concurrency in Java

Java collections framework

Spring Boot microservices & JPA/Hibernate

Exception handling in Java

✅ What You’ll Learn

Core Java: OOP, Generics, Collections, Exceptions

Spring Boot: Auto-configuration, Beans, Annotations, Dependency Injection

JPA / Hibernate: Entity relationships, Lazy vs Eager loading, Transactions, N+1 problem, Inheritance strategies

Multithreading & Concurrency: Threads, Executors, Synchronization, False Sharing, Best Practices

⏱️ Timestamps
0:00 Introduction
2:26 Filter + Map + Reduce in One Stream Pipeline (Java 8)
7:38 Reduce vs Collect Operation
9:09 Collectors.groupingBy() vs partitioningBy()
10:53 List of Employees → Map by Department using Streams
12:44 run() vs start() in Java Threads
15:22 Synchronization: What & Why
19:56 False Sharing in Java
24:19 Producer-Consumer Problem Implementation
40:32 Synchronized vs ReentrantLock
42:47 volatile Keyword in Java
44:07 N+1 Select Problem in Hibernate/JPA
47:09 JPA Inheritance Implementation

🔍 Who This Video Is For

Java developers with 3–8 years experience

Backend engineers preparing for Infosys Java interviews

Anyone strengthening Spring Boot, JPA, and concurrency knowledge

🔑 Useful Resources

Java Documentation: https://docs.oracle.com/javase/

Spring Boot Docs: https://spring.io/projects/spring-boot

Hibernate / JPA Guide: https://hibernate.org/orm/documentation/

👍 Like, Subscribe & Hit the Bell for more Java, Spring Boot & backend interview prep:
/ @mjbackend

📌 Hashtags

#JavaInterviewQuestions #JavaInterviewQuestionsAndAnswers #CoreJava #Java8InterviewQuestions #MultithreadingInJava #JavaConcurrency #JavaCollectionsInterview #ExceptionHandlingInJava #SpringBootInterviewQuestions #JavaSpringBootInterview #SpringBootMicroservices #JavaMicroservices #HibernateInterviewQuestions #JPATutorial #BackendDeveloperInterview #JavaBackendDeveloper #JavaFullStackInterview #RealTimeJavaInterview

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