Quiz Questions
For Chapter 9
THIS PAGE CONTAINS A SAMPLE quiz on material from
Chapter 9 of this on-line
Java textbook. You should be able to answer these questions after
studying that chapter. Sample answers to all the quiz questions can
be found here.
Question 1:
What does it mean to say that a program is robust?
Question 2:
Why do programming languages require that variables be declared before
they are used? What does this have to do with correctness and robustness?
Question 3:
What is "Double.NaN"?
Question 4:
What is a precondition? Give an example.
Question 5:
Explain how preconditions can be used as an aid in
writing correct programs.
Question 6:
Java has a predefined class called Throwable. What does this class represent?
Why does it exist?
Question 7:
Write a subroutine that prints out a 3N+1 sequence starting
from a given integer, N. The starting value should be a
parameter to the subroutine. If the parameter is less than or equal to
zero, throw an IllegalArgumentException. If the number in
the sequence becomes too large to be represented as a value of
type int, throw an ArithmeticException.
Question 8:
Some classes of exceptions require mandatory exception handling.
Explain what this means.
Question 9:
Consider a subroutine processData that has the header
static void processData() throws IOException
Write a try...catch statement that calls this
subroutine and prints an error message if an IOException
occurs.
Question 10:
Why should a subroutine throw an exception when it encounters
an error? Why not just terminate the program?
