Interview on java fundamentals, oops concepts, collections Explain about the MVC architecture, SQL Query, insert, update, delete query, sql joins, multithereding, lifycycle of the thread What are the main features of Java? Explain the difference between JDK, JRE, and JVM. What is the difference between == and .equals() in Java? What are wrapper classes in Java? What is the difference between String, StringBuilder, and StringBuffer? What is a constructor? How is it different from a method? What is the difference between ArrayList and LinkedList? What is the difference between an interface and an abstract class? What is method overloading and method overriding? What is the difference between static and non-static methods?