Core Java Interview Questions For Beginners to professional - Part 1

In this video, we discussed following questions. Is Java Platform Independent if then how? Difference between JVM, JRE, and JDK. What is a classloader? what are the different types of classloader? How String is immutable? What is Java String Pool? What are the differences between String and StringBuffer? What are the differences between StringBuffer and StringBuilder? Which among String Builder or String Buffer should be preferred when there are a lot of updates required to be done in the data? How to create immutable class in Java? What is the Wrapper class in Java?Why do we need wrapper classes? What is a static variable? Explain the difference between instance variable and a class variable. What is the transient keyword? What are Access Specifiers and Types of Access Specifiers? What is a marker interface? Why we need marker interface? What are the differences between abstract class and interface? What do you mean by encapsulation? What is Polymorphism? What is Inheritance? What is Abstraction?