1. Write a program that generates a random
GlobalCredit
using
GlobalCredit.getRandom()
.
Print each RewardCard
(if any) in the
collection (but not the CreditCard
s).
(This is basically a search for all of
the RewardCard
s).
2. Study the Fraction
,
MixedFraction
, and Money
classes in type.lib
.
Write a program that outputs the result of invoking
Money.getRandom()
100 times.
3. Problem 9.18 of the textbook (you can easily modify your solution to Question 2).
4. After doing Questions 2 and 3,
attempt eCheck 09C; the textbook says there
should be about 31 terminated statements,
but you can do it in around 20. Inside
your loop you should only need to
use instanceof
in one
if-statement.
5. Write a program that generates a random
Student
reference called stu
using
Student.getRandom()
inside a loop
that runs 10 times.
Output the result of invoking getClass
on stu
each time through the loop;
also output the result of invoking getClass().getName()
on stu
.
6. See Question 5. Modify your solution to Question 5
so that it outputs just the class name (ITStudent
instead of type.lib.ITStudent
, for example).
Consider using split
or, lastIndexOf
and substring
in String
.
7. After doing Questions 5 and 6, attempt eCheck 09D.
8. Run the following program and explain its output:
public class P09Q8 { public static void main(String[] args) { String s = null; System.out.println(s instanceof String); } }
9. Compile the following program and explain the result:
public class P09Q9 { public static void main(String[] args) { String s = null; System.out.println(new P09Q9() instanceof String); } }