1. Why the main method is static in java?
  2. What is “this” keyword in java?
  3. What is an abstract class?
  4. How abstract classes are similar or different in Java from C++?
  5. What is object cloning?
  6. How is inheritance in C++  different from Java?
  7. Can we override private methods in Java?
  8. What is “super” keyword in java?
  9. How are Java objects stored in memory?
  10. Differences between HashMap and HashTable in Java.
  11. What is static variable in Java?
  12. How HashMap Works in Java
  13. Design a Good Key for HashMap

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