Domande di colloquio per Junior Java Developer presso RS Software

I applied via naukri and received a call from the HR for initial telephonic round. Thereafter, she scheduled a face-to-face technical interview at their Kolkata office. Technical Round (26th December, 2025): The interview mostly focused on in-depth understanding of OOPs concept, Java 8 and Spring Boot. Introduce yourself. What type of work you're doing in your project? Who is the client and is your project service/product based? What is method overloading? Can we overload by changing return type? What is method overriding? Can we override static methods? What happens if we declare a static method in the subclass with the method signature as its parent class method? (method hiding) Return type in method overriding has to be same? (same or covariant type) Is it allowed if parent class method has return type int (any primitive) and subclass method has return type long? (Java does NOT support covariant return types for primitives) Do you know about static method? Can we call a static method normally using object/instance of the class? What is static block? When is static block invoked? If we have static block in 9 classes and a main method in 10th class, will static block be invoked? What is instance initializer block? When it is invoked? Can we declare this() and super() anywhere in the constructor in any line? Suppose we have a parent class with a constructor Parent(int a, int b) and a child class with two constructors Child(int a, int b), Child(int a, int b, int c). How we can call both parent class constructor and 2nd child class constructor from first one? Do you know about functional interface? What is the use of functional interface? Do you know the names of any predefined functional interface? What is the name of the method in Consumer? What is the name of the method in Predicate? Have you used Stream API in your project? In stream api, do you know how normal for loop differs from for loop in stream api? What are default methods in Java 8? Why default methods were introduced in interface? Why abstract class still exists even though interface can have default concrete methods now? Any more tech stack you've worked on in your project? (Spring Boot) What is Spring Boot? What is the difference between Spring and Spring Boot? Which container provides the auto-configuration or injects dependencies? (Spring IoC Container) Can you name the container used in Spring Boot? (ApplicationContext, metioned that I don't know about it in depth) Do you know what is @ComponentScan? What is @Repository? What happens if we interchange @Service and @Repository? Is it allowed? What is inner join ? Any more tech stack you know? (Angular) Verdict: Rejected. The interviewer asked few tricky questions including why and what's the need of this feature that was introduced, maybe he wasn't satisfied with my answer to these kind of questions. I answered few questions wrongly but I will take it as a good learning experience and try to improve myself.