Questions from telephonic round Two hashmaps each with 50 n 500 elements. I fetch get(“50”). What will be its time complexity? Difference between ovrrloading n overriding What is transient variable? What if I still want to save the valur of transient variable? How will u do it? What is serialversionuid? What happens if u dont specify one? Does it give exception n what is the exception? Different ways to create a thread Difference between serializable n externalizable In java 8 does hashmap still uses linkedlist? What is primary key n unique key What is advice, pointcut, joinpoint n aspect How many ways u can program aop in spring What is PostConstruct n PreDestroy Different states of object in hibernate How can u move an object from persistent state to detached state Different generator strategy in hibernate How to configure ehcache in hibernate What is spring boot? How does hashset work? 3rd round f2f technical Jvm architecture Give an example of singleton in ur project What is string.intern Why did java 8 introduced new garbage collection algorithm? Why is perm gen removed in java 8? How will you create a socket? How will u create a chat application? Write pseudo code A report fetching runs faster in jdbc vs hibernate. Hiw can u troubleshoot why hibernate is slower? A new functionality breaks an existing feature. How could u prevent this? Writr code to generate pyramid using * What is a string pool? 4th round coding You need to write a cab management system service for employee cab drops. There are 3 types of cab 4 seater, 6 seater and 8 seater. Implement the following methods in service GetAvailableSeats() with no preference GetAvailableSeats with a preference like 4 seater etc BookCab for an employee with no preference BookCab for an employee with preference Cancelcab GetListofallemployeedrops Propose a technical design. Additinal points to note If an employee has booked cab he cannot book again If an employee has not booked cab he cannot cancel An employee can only book 1 seat In the beginning there will be only 1 cab each of a given type