Mobileum Bangalore Core Java Developer Interview

Mode - Telephonic
Date - April 2020
Experience - 3 years
Interviewer - Mohak Gogri
  1. Tell me briefly about yourself.
  2. Explain all the projects that you have worked on.
  3. What are the differences between String , StringBuffer and StringBuilder?
  4. Why String is Immutable?
  5. What are the other immutable classes are there in java?
  6. How to make a user defined class Immutable?
  7. What are the access modifiers in java?
  8. What are the differences between ArrayList and LinkedList?
  9. In LinkedList there is a loop that 4th element is pointing to 1st or 2nd element, then how can we detect whether the loops are there or not in LinkedList stored data? In short the question is "How to detect a loop in LinkedList"?
  10. Explain the logic for prime number.for(int i=2;i<=n/2;i++) .Can you make it more efficient by making some changes in testing condition part of this existing code?
  11. What are the differences between Interface and Abstract class? If abstract class is there then what's the need of interface? or If Interface is there then what's the need of abstract class?
  12. What are the practical differences between overloading and overriding?
  13. Can we override static methods? Explain it in brief.
  14. In class A method m1(int,int) is there and in class B method m1(int,int) is there. Here B extends A. Then can we say m1 in B is overriding m1 of A?
  15. If you get ClassNotFoundException, then how will troubleshoot it?
  16. What is classpath?
  17. How frequently you write the database query codes?
  18. How to find second highest salary from Employee table?
  19. There is table Employee having columns empid,department,salary. How to find the maximum salary of employee department wise?
  20. What are the restrictions on the columns that we can mention in select clause while using Group By clause?
  21. What are the differences between group by and where clause?
  22. What is view? and what are it's benefits?
  23. What are the differences between Stored Procedures and Triggers?
  24. What are the coding guidelines you are using in daily life at workplace?
  25. What are the desing patterns have you used in your projects?
  26. What is SOLID principle, Are you aware about open-closed principles?
  27. RESTful webservices are stateless or not?
  28. What are the benefits of it's being stateless?
  29. What are the resources in RESTful?


  1. Really Very Helpful Interview Questions.
    Thanks a lot for Sharing.


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