Amazon

Trees and graphs are fundamental concepts that require a better understanding of core knowledge. Knowledge of Data Structures and Algorithms (DSA) is most required, so graphs are mostly focused on. At the end, interviewer questioning is a must.

It was through Campus Recruitment. First round was OA consisting of 2 medium-level questions. One question was related to matrix. Interview was around one hour long, consisting of questions related to linked list, DP, and tree.

What are the four pillars of OOPs in Java? Explain each with an example: * Abstraction * Encapsulation * Inheritance * Polymorphism What is the difference between an abstract class and an interface? Explain method overloading versus method overridi