Q1. Why is String Immutable? What is String Pool? How to create a String which is not stored in String Pool? What is REST Web Service? Life Cycle of a thread? If Rest is Stateless How do you maintain Sessions? View answer (8) Q2. Questions were mainly on java on topics like String, Internal implementation of HashMap, OOPs, Thread, Java 8 features. Coding question - How to reverse a string without using built in methods. Add Answer Q3. what are the difference between abstract class and interface, and throw and throws, and why we use throws?? Why String is Immutable? View answer (2) Q4. it was quite easy, and i got selected in tcs , after that i have submitted my all the documents in portal, after that it's been a one month, but they have not send me any mail that i have got selected or not, they are not responding even if i call them. Add Answer Q5. What is daemon thread? How it help in multithreading? View answer (2) Q6. What is class loader? How do you call a service from another service? How to inject array from Application.properties file? View answer (1) Q7. Static block ,instance block and method execution flow View answer (4) Q8. 1. What is JDK, JVM, JRE. View answer (11) Q9. What is core features of spring framework? View answer (1) Q10. This round