Interview of JPMC

1.Working of HashMap , why we use LinkedList in it .
2. Why we need IOC in Spring , why cant we just use new operator.
3. Difference between HashTable vs ConcurrentHashMap
4. Different method in Object Class.
5. Explain final , finally and finalize.
6. Exception in java and hierarchy.
7 Explain the Difference between ClassNotFoundError and ClassDefNotFountException
8. what are design pattern you have worked  on it.
9. How ArrayList Work internally .
10. Why we need Linked List and whats wrong with using ArrayList.
11 How ArrayList increases size .
12.Difference between Array And ArrayList.
13. Why we need the Executor framework , Explain in detail about the Executor framework.
      explain the working. What we pass to the executor, thread or process.
14. Comparable and Compactor why it exists and internal working.
15. How will you do Many to Many Mapping into Hibernate.
16.Session in the hibernate.
17. Difference  between save and update in hibernate.
18.