Accenture Software Engineer interview questions

What are the main features of Java and why is it platform-independent? Explain OOP concepts in Java. What is the difference between abstract class and interface? Difference between == and equals() in Java? How does HashMap work internally? Difference between ArrayList and LinkedList? What are checked and unchecked exceptions? What are lambda expressions and functional interfaces? Explain multithreading and how synchronization works. What is JVM, and how does memory management work in Java?