Java

  1. Discuss JVM, JRE and JDK?
  2. What is a Class and Object?
  3. What is the difference between an Interface and an Abstract class?
  4. What’s difference between Static and Non-Static fields of a class?
  5. What are inner classes and what’s the practical implementation of inner classes?
  6. What is a constructor in class?
  7. What are the different types of modifier in java, explain them?
  8. What is the difference between final and static?
  9. What are Native methods in Java?
  10. What is the garbage collector?
  11. What do you understand by “final” and “finally” keyword?
  12. How can you copy one array in to a different array?
  13. Difference between HashMap and Map?
  14. Difference between HashMap and HashTable?
  15. Difference between Vector and ArrayList?
  16. Explain the java exception handling.
  17. Difference between error and an exception?
  18. What are pass by reference and passby value?

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