If you’re preparing for a Java interview, you’re likely wondering what kind of questions you’ll be asked. Interviews can be stressful, but with the right preparation, you can ace them. In this article, we’ll cover the most commonly asked interview Java questions to help you prepare.

Java is a popular programming language used in developing web and mobile applications, and it’s a must-know for developers. This makes it a popular topic in job interviews. Knowing these interview Java questions can give you an edge over other candidates and help you land your dream job.

Core Java Concepts

1. What is Java?
2. What is the difference between JDK, JRE, and JVM?
3. What are the different data types in Java?
4. What is the difference between the “==” operator and the “.equals()” method?
5. What is a constructor in Java?
6. What is the final keyword used for?
7. What are static methods and variables?
8. What is the difference between an abstract class and an interface?
9. What is the difference between a checked and unchecked exception?
10. What is the difference between throw and throws in Java?

Object-Oriented Programming (OOP) Concepts

1. What is OOP?
2. What are the pillars of OOP?
3. What is inheritance, and how does it work in Java?
4. What is polymorphism?
5. What is encapsulation?
6. What is abstraction?
7. What is the difference between an abstract class and an interface?
8. What are access modifiers in Java?

Exception Handling

1. What is an exception in Java?
2. What are the types of exceptions in Java?
3. What is the try-catch-finally block?
4. What is the difference between checked and unchecked exceptions?
5. What is the difference between throw and throws in Java?

Multi-threading

1. What is multi-threading?
2. How can you create a thread in Java?
3. What is synchronization?
4. What are the different states of a thread in Java?
5. What is a deadlock in Java?

Collections Framework

1. What is the Collections Framework in Java?
2. What are the different types of collections in Java?
3. What is the difference between ArrayList and LinkedList?
4. What is the difference between a Set and a List?
5. What is the difference between a HashMap and a Hashtable?

Java Virtual Machine (JVM)

1. What is the JVM?
2. How does the JVM work?
3. What is the difference between the JVM, JRE, and JDK?
4. What is garbage collection in Java?

Spring Framework

1. What is the Spring Framework?
2. What are the benefits of using the Spring Framework?
3. What are the different modules in the Spring Framework?
4. What is dependency injection in Spring?