What is the basic structure of a Java application?

What is the basic structure of a Java application?

• A. A class containing a main() method and statements inside the method.
• B. A script file with no class.
• C. A package with multiple interfaces.
• D. An applet embedded in HTML.

Answer: (A)

In Java, a program starts from a class that contains a main method, and the executable statements live inside that method. The entry point is the public static void main(String[] args) method, which the Java Virtual Machine calls to begin execution. This structure — a class housing the main method with the program’s statements inside — is what allows the Java runtime to run your application. The other options don’t fit because a script file with no class isn’t valid Java code, since Java requires code to be organized inside classes. A package with multiple interfaces is a way to organize types, not an executable program by itself. An applet embedded in HTML is an old approach for running code in a browser, not the basic structure of a standard Java application.

In Java, a program starts from a class that contains a main method, and the executable statements live inside that method. The entry point is the public static void main(String[] args) method, which the Java Virtual Machine calls to begin execution. This structure — a class housing the main method with the program’s statements inside — is what allows the Java runtime to run your application.

The other options don’t fit because a script file with no class isn’t valid Java code, since Java requires code to be organized inside classes. A package with multiple interfaces is a way to organize types, not an executable program by itself. An applet embedded in HTML is an old approach for running code in a browser, not the basic structure of a standard Java application.