Al Ansari Exchange interview questions

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