Java Questions Which Are Asked In Interview

Written by Prithwiraj Bose on . Posted in Programming Tips Tricks Tutorials

Here are some of the Java questions which are often asked to new joiners in our project interview. You will get a basic idea of Java project interviews in TCS. I’ll publish the answers in future, may be as a separate blog post.
  1. What is the difference between Method Overloading and Method Overriding?
  2. What is the difference between Runtime Exception and Compile Time Exception?
  3. What is a checked exception? What is an un-cheked exception?
  4. Do Java support Multiple Inheritance? If yes, how?
  5. What is a Marker Interface? Give an example.
  6. What is the difference between JRE, JDK and JVM?
  7. Explain the visibility of 4 types of access modifiers – Public, Protected, Default, Private?
  8. Can a class constructor be private? If yes, why do we need such constructors?
  9. What is a wrapper class?
  10. What is an immutable object?
  11. Can we declare a variable inside an interface? If yes, then what should be the variable’s modifiers?
  12. What is an Abstract Class?
  13. What is coupling and cohesion?
  14. What is type-casting?
  15. What is the default value of a ‘char’ variable?
  16. What is the difference between ‘Bitwise AND’ and ‘Logical AND’ operator?
  17. How do you iterate through a HashMap?
  18. What are the advantages of using ArrayList<String> over String Array (String[]) ?
  19. What is Generics?
  20. What is Reflection?
  21. What is Auto-Boxing?
  22. How are Javadoc comments different from normal comments?
  23. What is a Object Factory Method?
  24. What is Var Args?
  25. Is it possible to write a try block without catch?
I hope you like these questions. Comments are welcome with any query or doubt.

[Update: I have started writing the answers as separate blogs. The answered blog posts are hyperlinked from the questions.]

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Prithwiraj Bose

I am an Architect of Distributed Applications of Information Services Industries in TATA Consultancy Services Ltd. I live in Kolkata, India. I love computers, programming, travelling and singing. Photography, spending time with my aquarium, designing a random website, painting, and singing are my favorite pass time. I've recently grown interest in Electronics, IoT and Robotics.

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