Lecture 10

Question 1

Which three things can cause “problems” with your program? Give examples

Answer 1

• The programmer, error in source code
• The user, giving wrong input (floating-point instead of int)
• The environment, file not found

Question 2

What three types of errors can a “problem” with your program result in? Rank them from worst to least bad.

Answer 2

Error in results
Error during execution
Error during compilation

Question 3

What is the difference between an exception and an error?

Answer 3

Exceptions are usually solvable by the programmer (and should be solved), while errors are irrecoverable (e.g. hardware problems, running out of memory).

Question 4

What two types of exceptions are there? What is the difference between them?

Answer 4

Checked and unchecked exceptions. Java forces you to deal with checked exceptions (so either throw or catch them!)

Question 5

How do you create a structure to deal with exceptions?

Answer 5

Try { insert code}
catch(exceptionlol e) { insert code}
finally {close your scanner please & insert code}

Question 6

How do you create your own exception classes and why would you?

Answer 6

You would create your own to be specific about the exception that happened ( you always want to be as specific as possible!) and you do it by creating a class that inherits Exception and creating the methods MyException() and MyException(string s) and implementing them as super() and super(s).