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In this unit you’ve been learning about exception handlers, which allow programs to “try” an algorithm and “catch” a potential fault. They can prevent the program from crashing and take other actions, such as logging the event, notifying tech support, and presenting the user with a message that explains what happened. Many built-in exception handlers are present in Java, such as one that can catch errors in mathematical calculations. Having handlers look for specific kinds of crashes allows for differences in handling, such as a more specific message to the user than if the program detected only a “general” crash.
Read this list of 12 commonly used exception handlers in Java. For this discussion, consider an application that is used by a local pizza restaurant. The app is intended to include the following features for their customers:
Place an order online
Save, edit, and reorder favorites
Factor local sales tax into the calculation at checkout
Add a tip
Create an account, storing personal info including address and credit card details
Select pick up or delivery
Select a pick up or delivery time
View restaurant address and operating times
Fill out a contact form to inquire about franchising opportunities
Join the company’s rewards program
Based on your knowledge, experience and ideas, select one of the features listed above and describe an exception handler that you would use in this program to address that feature. Explain why this handler would be appropriate, how it would guard against a crash, what it would tell the user (the error message), and what other actions the program might take when your exception handler is engaged.
