Top 50 Java Interview Questions and Answers | Java Basics to Advanced | Core and Advanced Topics

Welcome to our comprehensive guide on the JAVA Interview Questions and Answers! Whether you're a beginner or an experienced Java developer, this video will help you prepare for your next job interview. We've compiled the most frequently asked questions covering everything from Java basics to advanced topics.

In this video, you'll learn about:
- Core Java concepts like classes, objects, inheritance, polymorphism, and encapsulation.
- Important distinctions between JDK, JRE, and JVM.
- Key differences between interfaces and abstract classes.
- Crucial programming principles such as exception handling, multithreading, and collections.
- Advanced topics like Java Reflection, Lambdas, and the Java Collections Framework.

Let’s confidently tackle Java interview questions and land your dream job. Make sure to watch till the end and share your feedback in the comments!

Tags:
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Chapeters:
Question 1: What is Java?
Question 2: Difference between JDK, JRE, and JVM?
Question 3: Main features of Java?
Question 4: What is a Class?
Question 5: What is an Object?
Question 6: What is Inheritance?
Question 7: What is Polymorphism?
Question 8: What is Encapsulation?
Question 9: What is Abstraction?
Question 10: Difference between Interface and Abstract Class?
Question 11: Use of 'super' keyword?
Question 12: What is Method Overloading?
Question 13: What is Method Overriding?
Question 14: What is a Constructor?
Question 15: Difference between Constructor and Method?
Question 16: What is Exception Handling?
Question 17: Checked vs Unchecked Exceptions?
Question 18: What is a Package?
Question 19: What is Multithreading?
Question 20: Use of 'this' keyword?
Question 21: What is the Java Collections Framework?
Question 22: Difference between ArrayList and LinkedList?
Question 23: What is a Map?
Question 24: Use of 'final' keyword?
Question 25: What is Garbage Collection?
Question 26: Purpose of 'toString()' method?
Question 27: Use of 'static' keyword?
Question 28: Difference between '==' and 'equals()'?
Question 29: What is JDBC?
Question 30: What are Lambda Expressions?
Question 31: What is the purpose of the main method in Java?
Question 32: Difference between String, StringBuilder, and StringBuffer?
Question 33: What are Wrapper Classes in Java?
Question 34: What is an Enum in Java?
Question 35: What is a Java Bean?
Question 36: Difference between '==' operator and '.equals() method'?
Question 37: What is a Singleton Class in Java?
Question 38: Use of 'instanceof' keyword?
Question 39: Difference between 'throw' and 'throws'?
Question 40: Use of 'synchronized' keyword?
Question 41: What is Java Reflection?
Question 42: What is a transient variable?
Question 43: What is a volatile variable?
Question 44: What is a default method in an interface?
Question 45: What is method hiding in Java?
Question 46: Use of the 'native' keyword?
Question 47: What is an anonymous class?
Question 48: What is a marker interface?
Question 49: Difference between process and thread?
Question 50: Purpose of the Optional class?
BONUS 👍
Question 51: Difference between heap and stack memory in Java?
Question 52: Difference between Array and ArrayList in Java?
Question 53: What is a functional interface?
Question 54: Difference between Hashtable and HashMap?
Question 55: Purpose of the 'assert' keyword?
Question 56: Access modifiers: public, protected, private, default?
Question 57: Use of 'break' and 'continue' statements in Java?
Question 58: What is a thread pool?

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