1. Can you derive an exception class from the predefined class IOException, or must it be derived from the class Exception? 2. What happens if you invoke a method and it throws a checked exception...

1. Can you derive an exception class from the predefined class IOException, or must it be derived from the class Exception?

2. What happens if you invoke a method and it throws a checked exception that it does not catch?

3.  Correct the following method definition by adding a suitable throws

clause:

public void doStuff(int n)

{

 if (n

 throw new Exception("Negative number.");

}

2