Summary: HelpClassDemo.java

Functionality Encapsulation:

• Objective: Classes must encapsulate specific and well-defined functionalities.
• Benefit: Facilitates code maintenance and reuse, avoiding confusion and destructuring.

Concept of a Help Class:

• Purpose: To provide information about the syntax of Java control statements.
• Benefits:
• Organization: The class groups features related to the help system.
• Maintenance: Facilitates updates or modifications without affecting the rest of the program.

Steps to Create the Help Class:
Function Identification: Determine which functionalities are central to the help system, such as displaying a menu, verifying the user's choice, and providing detailed information.
Separation of Responsibilities: User input and request retry functions are not part of the help class.

Help Class Structure:
helpOn(int what) method: Displays detailed information about the user's choice.
showMenu() method: Displays the menu of available options.
isValid(int ch) method: Checks whether the user's choice is valid.

Main Class Rewrite:

• New Class Integration: The main class, now called
• HelpClassDemo, uses the new Help class to manage the help system.
• Operation: User interaction with the help system is managed by methods within the Help class.

Result:

• Reusability and Maintenance: The help system is now a reusable and easy to maintain component.
• Functionality: The program remains functionally the same, but with a more organized and modular structure.

This process illustrates the importance of encapsulating functionality in well-defined classes, promoting a modular, object-oriented approach to software development.