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