Is it mandatory to include a main() method in every Java class?

• A. Yes, it is required for all Java classes
• B. No, only if the class is a Java application
• C. Yes, for classes that contain methods only
• D. No, it is optional for all classes

Answer: (B)

The main() method serves as the entry point for Java applications when they are executed from the command line or an IDE. However, it is not mandatory to include a main() method in every Java class.

A class that is not intended to be executed as a standalone application may not require a main() method. For example, utility classes with static methods, or model classes that define data structures, do not need a main() method because they are meant to be used within other classes or applications. Therefore, the requirement for a main() method applies specifically to those classes that serve as the entry point of a Java application.

Classes that only contain methods, including classes designed as part of a library or framework, do not need a main() method. Thus, while some classes in Java applications will contain a main() method, it is not a necessity for every class in the Java programming language.