Ever worked with Optional class What are Optional Classes. Solid Principle ->Liskov Substitutional Principle Design Pattern ->Prototype Submitting and Executing Ever worked with Hibernate Many to Many Data mocking Marker Interface Volatile and Transient Variable Modifier Types of dependency injection A a = new A() is it correct A b = new B() is it correct B b = new A() is it correct Ever worked with Optional class -> Off and Off nullable Sql query for -> Id, name and salary having name of employe with 7th highest salary Ever worked with Rest API Ever used microservices