Java Sql and basic Coding question.

Round 1: Core Java Question ############################## Introduce Yourself What is the purpose of static methods and variables? What is object-oriented paradigm? What is the difference between an object-oriented programming language and object-based programming language? What will be the initial value of an object reference which is defined as an instance variable? What is the static variable? What is the static method? What are the restrictions that are applied to the Java static methods? Why is the main method static? What is the static block? Can we override the static methods? What if the static modifier is removed from the signature of the main method? Can we execute a program without main() method? Can we make the abstract methods static in Java? Can we declare the static variables and methods in an abstract class? What is this keyword in java? What are the main uses of this keyword? What is the Inheritance? Why is Inheritance used in Java? Which class is the superclass for all the classes? What is the use of super keyword? What is aggregation? Why is method overloading not possible by changing the return type in java? And Some concept of method overrlding and overloading Round 2: Advance Java Question ############################## 5 step data base connectivity thread safety why we cant call run directly? what is thread ? Resultset Db rowset Db Multithreading example WAP java program to remove duplicity from string Round 3: Research topic Question ############################## 1) DGC (Data Governance and Collibra Data Governance.) 2) REST API 3)Salesforce 4) Data Quality. 5) AWS