1. Explain JDK, JRE and JVM?
  2. Explain public static void main(String args[]) in Java
  3. Why Java is platform independent?
  4. Why Java is not 100% Object-oriented?
  5. What are wrapper classes in Java?
  6. What are constructors in Java?
  7. What is singleton class in Java and how can we make a class singleton?
  8. What is the difference between Array list and vector in Java?
  9. What is the difference between equals() and == in Java?
  10. What are the differences between Heap and Stack Memory in Java?
  11. What is a package in Java? List down various advantages of packages.
  12. Why pointers are not used in Java?
  13. What is JIT compiler in Java?
  14. What are access modifiers in Java?
  15. Define a Java Class.

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