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

Consisted of an OA, followed by two rounds of interviews: one technical and one HR. In the first round, two DSA questions were asked, followed by projects and CS fundamentals. It was an on-campus process.

There were 3 technical rounds, mainly focused on C++. They were completely asking coding questions. You need to code, and they asked questions on it. So, it's better to prepare on customized inbuilt functions. Be confident.