Important Java Interview Questions

  1. Explain OOP's concepts in java?
  2. In what cases you will use Abstract Class and Interfaces?
  3. What is stack and heap meamory in java?
  4. What is runtime exceptions? Give some examplls?
  5. Write a actual singleton java class?
  6. Wite a program to print the given array in reverse order {2,5,3,1,4} ?
  7. What is the difference between sleep() and wait() methods?
  8. What is the difference between ThreadClass and Runnable interface in Java?
  9. Explain Servelt life cycle ?
  10. Difference between forward() and sendRedirect() ?
  11. How JSP handle runtime Exceptions?
  12. Why hibernate?, Why not JDBC?
  13. What is the importance of SessionFactory in Hibernate?
  14. Difference between merge() and Update() methods?
  15. What is Secondarylevel cache in hibernate?

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