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In the context of DBMS and Java Lab, understanding the concepts of abstract classes and interfaces is essential for designing modular and extensible software systems. These features support abstraction and multiple inheritance, which are fundamental for object-oriented programming. ### Abstract Class Example Assume a system where different types of database users (like `Admin`, `Guest`, etc.) perform certain operations. An abstract class can define common methods while allowing subclasses to implement specific behavior. ```java abstract class DatabaseUser { String username; DatabaseUser(String username) { this.username = username; ___ ______ ____ ___ _______ __________ ___ ____ __________ _________ __________ _______.
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