Top 30 Java Basic Interview Questions and Answers with Real Life Use Case Asked by Top Company
Are you preparing for Java interviews at top service-based companies like TCS, Infosys, Wipro, Tech Mahindra, Accenture or Cognizant? 🚀
In this video, we’ll go through the Top 30 Basic Java Interview Questions that are commonly asked for freshers and beginners (0–1 year experience).
You’ll learn each concept with clear explanations, real-life use cases, and sample code examples — perfect for both interviews and hands-on learning.
By the end of this video, you’ll be fully ready to face your Java technical rounds with confidence 💪
🎯 30 Basic Java Interview Questions for Freshers
What are the main features of Java?
What is JVM, JRE, and JDK?
Why is Java platform independent?
What is the difference between == and equals()?
What is the difference between primitive types and wrapper classes?
What are constructors in Java?
What is the difference between method overloading and overriding?
What is inheritance in Java?
What is polymorphism in Java?
What is abstraction in Java?
What is encapsulation in Java?
What is the difference between an abstract class and an interface?
What are access modifiers in Java?
What is the difference between final, finally, and finalize()?
What is the difference between String, StringBuffer, and StringBuilder?
What are static variables and static methods?
What is the use of the this keyword in Java?
What is the difference between checked and unchecked exceptions?
What is garbage collection in Java?
What are threads in Java?
What is synchronization in Java?
What is the difference between an Array and an ArrayList?
What is the difference between HashMap and Hashtable?
What is the difference between Iterator and ListIterator?
What is the difference between throw and throws?
What is the difference between compile-time and runtime polymorphism?
What are packages in Java?
Why is the main method written as public static void main(String[] args)?
What is the difference between heap and stack memory?
What is the difference between a process and a thread?
🧠 What You’ll Learn:
Java Core Concepts
OOPs (Object-Oriented Programming)
Exception Handling
Collections Framework
Threads and Memory Management
Interview-Focused Code Examples
🔗Java Interview Preparation Playlist: • Java Backend Developer Interview Questions...
💼 Perfect For:
Java Backend Developers
Spring Boot Learners
Interview Preparation
Freshers & Experienced Devs
💡 Use Case:
These questions are perfect if you’re applying for:
Java Developer
Software Engineer
Associate Developer
Trainee Engineer roles
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