1. how will you make a class immutable? 2. Create MyCustomBuffer class like features of StringBuffer. Can we make this class as final? 3. diff btwn RestController and Configuration 4. What all design patterns have you worked on, explain their implementations and scenarios. 5. how will u design a restaurant application. 6. default scope of dependency in maven. 7. have you worked on any database connection pooling? 8. internal impl of hashmap 9. streams api java 8 ******* 10. employee list --> find empl with salary>100 11. time complexity improvements in java 8 12. diff btwn stringbuffer and stringbuilder. 13. string immutability.explain 14. reverse a string in different ways. 15. how to implement singleton pattern and in what situation.