L-1:
1. First Non Unique Character using loops
2. Singleton with Thread Safety Pattern
3. 2nd Highest Salary in SQL
4. Microservice Architecture
L-2:
1. Your current project architecture & low level design & Explanation
2. How many ways to create a threads & Which one is prefer
3. Count integer frequency using loops only.
int[] a = {1,2,2,3,3,4,4,4,5,6,7,7};
4. String reverse order is same but use loops only "Java is good programming language"
5. How will write a query to change male to female & female to male with using SQL in 2L records.
6. ACID Properties & @Transactional
7. FirstLevel Cache & Second level cache
8. @OneToOneMapping Code for Class A & Class B
9. Transient vs Volatile
10. Spring core Annotations
11. Spring Bean Scopes