Applied

• Given an application that uses the console to get input from the user, write code that handles any exceptions that might occur.
• Given an application that uses the console to get input from the user and the validation specifications for that data, write code that validates the user entries.
• Given the Java code for an application that uses any of the language elements presented in this chapter, explain what each statement in the application does.

Knowledge

• Explain what an exception is in Java.
• Describe the Exception hierarchy and name two of its subclasses.
• Explain what the stack trace is and how you can use it to determine the cause of an exception.
• Explain how you use the try statement to catch an exception.
• Explain what an exception handler is and when the code in an exception handler is executed.
• Explain how you can use methods of the Scanner class to validate data.
• Explain why it's usually better to validate user entries than to catch and handle exceptions caused by invalid entries.
• Describe the two types of data validation that you're most likely to perform on a user entry.
• Explain why you might want to use generic methods for data validation.