DXC Technology Senior Developer Java interview questions

The interview process is start directly with Tech Interview, with coding test for about 30 minutes and tech question for 30 minutes. Simple algorithm test for live coding. The interviewer was nice and explain the question in detail

Core Java Questions 1. Basics of Java What are the key features of Java? Explain the differences between JDK, JRE, and JVM. What is the difference between == and .equals() in Java? 2. OOP Concepts Explain the four pillars of Object-Oriented Programming (OOP): Inheritance, Encapsulation, Polymorphism, and Abstraction. How is method overloading different from method overriding? What is an abstract class, and how is it different from an interface? 3. Collections Framework Explain the difference between ArrayList and LinkedList. How does HashMap work internally in Java? What are the differences between Set, List, and Map?