Try this: Improve the Java help system

This version adds the syntax of for, while and do-while loops. It also checks the user's selection in the menu, looping until a response
valid to be entered.

1. Copy Help.java into a new file called Help2.java

2. Change the first part of main( ) so that it uses a loop when displaying the options.

Note that a nested do-while loop is used to discard any unwanted characters remaining in the input buffer. After this change, the program will enter a loop, displaying the menu until the user enters an answer between 1 and 5.

1. Expand the switch statement to include for, while, and do-while loops, as shown below:

Note that there is no default statement present in this switch version. Since the menu loop ensures that a valid answer is entered, it is no longer necessary to include a default statement for handling a choice
invalid.

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