IBM

Core Java & OOP What are the four pillars of Object-Oriented Programming? Can you explain each with examples? Difference between an abstract class and an interface? When do you use which one? What is polymorphism? Explain compile-time vs run-time

It was a written test, on clearing which there was a 1:1 interview.

The process was very smooth and promising. There were three rounds of interviews: two technical followed by one HR round. There is also one mandatory test candidates have to clear. If you have not cleared this test, your selection will be meaningles