First round Aptitude, 2 Technical Rounds and an HR interview at the end. aptitude question were average difficulty level. First technical -basic knowledge on core subjects, Second Technical-in depth question on your area of expertise.

In first technical round they asked about my project, then questions on servlets, along with basic questions on all core areas, like OSI model from networks, semaphores from operating system, database query to find second highest salary and at the end give a basic program to merge 2 arrays and print them in reverse order.

Second, technical round was quite complicated, asked in depth topics of Java like serialization, native keyword, alternative use of class.forName etc., then I was asked to write code for insertion in BST, and then a program on arrays.

HR round was normal, just basic conversation, just don't try to behave casually it will result in sure rejection.