Tata Consultancy Services Software Developer interview questions

Core Java: Difference between HashMap and ConcurrentHashMap Explain equals() and hashCode() contract. What is the difference between final, finally, and finalize()? OOP Concepts: Explain inheritance and polymorphism with examples. How is abstraction achieved in Java? Multithreading: What are the states of a thread? How to create a thread-safe class? Spring Framework: Explain dependency injection. Difference between @Component, @Service, and @Repository. Life cycle of a Spring bean. Coding Task (Shared screen): Write a Java program to find the second highest number in an array.

The interview process was very difficult and long and I was not ready for it. In the end i didn't get the job. the process was also very time consuming