Java Interview Questions 🔥 | Top 80 Most Asked | Core Java, Spring Boot, Microservices | 1–10 Yrs
Crack your Java interview with confidence! 🚀
This video covers real Java interview questions and answers for experienced developers (3–8 years / 1–10 years), including Core Java, Java 8, Collections, Multithreading, Concurrency, Exception Handling, Spring Boot, Microservices, JPA, Hibernate, and backend development.
These are the most frequently asked Java interview questions in top MNCs like Infosys, TCS, Wipro, Accenture, Capgemini, Cognizant, HCL, and Tech Mahindra, as well as product-based companies. Whether you’re preparing for a Java backend developer interview, a Spring Boot microservices interview, or revising Core Java concepts, this video will help you ace your interview.
💡 Why Watch This Video?
✔ Covers high-yield, frequently asked Java interview questions
✔ Focuses on Core Java, Java 8 features, Collections, Multithreading, Concurrency, and Exception Handling
✔ Includes Spring Boot, REST API, Microservices, Hibernate & JPA interview questions
✔ Ideal for backend developers, Java full-stack developers, and experienced Java professionals
🔥 Top Topics Covered
🔹 Core Java
OOPs concepts
Java 8 features
Generics
Collections Framework
Exception Handling
Immutable objects
🔹 Advanced Java
Multithreading & Concurrency
Thread lifecycle
Executors framework
Synchronization
🔹 Spring Boot & Microservices
Dependency Injection
Auto-configuration
REST APIs
Spring Boot microservices architecture
🔹 JPA / Hibernate
Entity relationships
LAZY vs EAGER loading
Transactions
ORM concepts
🔹 Exception Handling
Custom exceptions
Try-with-resources
Exception propagation
Finally block behavior
⏱️ Timestamps (Detailed Interview Questions)
0:00 What is JDK, JRE, JVM?
4:53 Class Loader in Java (with Example)
8:12 System.out.println Explained
10:04 public static void main Explained
12:39 Reading Config Server Values Without Restart
15:55 Fixing Memory Leak Problems
18:23 OOPs Concepts
21:28 throw vs throws
22:42 final vs finally vs finalize
23:30 == vs equals()
24:49 Why String is Immutable
26:42 HashMap Internal Working
29:32 HashMap vs ConcurrentHashMap
30:48 ArrayList vs LinkedList
31:50 Static Keyword (Variables, Methods, Blocks, Nested Classes)
32:47 Can We Override a Static Method?
33:05 Abstract Class vs Interface
34:25 Marker Interface
36:03 Transient Keyword
36:44 Comparable vs Comparator
38:00 Checked vs Unchecked Exceptions
40:43 Exception Propagation
40:54 Multiple Catch Blocks
41:38 Exception in finally Block
42:09 Can Constructor Throw Exception?
42:30 Custom Exception Creation
43:02 Try-with-Resources
44:05 Microservices & Exception Handling
✅ Official Resources
📘 Java Documentation
https://docs.oracle.com/javase/
🌱 Spring Boot Documentation
https://spring.io/projects/spring-boot
🗄 Hibernate / JPA Documentation
https://hibernate.org/orm/documentation/
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