Java Program Structure

A Java program may contain one or more section which is as follow:

1. Documentation section (suggested)
The documentation section comprises a set of comment line of the program, the author
and other details, which the programmer would like to refer to at a later stage.

2. Package statement (Optional)
This statement declares a package name and inform the compiler that the class defined here belong to this package.
Ex: package student;

3. Import Statement (Optional)
This statement instructs the interpreter to load the specific class contained in the package.
Ex: import student. test;

4. Interface Statement (Optional)
An interface is like a class but include a group of method declarations.

5. Class Definitions (Optional)
Classes are the primary and essential elements of Java program. These classes are used
to map the object of real world problems.

6. Main Method Class (Essential)
As every Java stand-alone program requires a main method as its starting point, this class is the essential part of the program.