Programming Assignment #2

Programming Assignment #2

(Using an Existing Class: Creating Objects
and Calling Accessor and Mutator Methods)
I. The Assignment

This assignment is to write a “test” class (aka: a “driver” class or “client code”) that uses the class Balloon.java, available on the class web page.

To use the Balloon class, download it and store it in the src folder of your NetBeans project. Make sure you save it as Balloon.java.

The best way to learn how to use the Balloon class – or any other Java class – is to consult the documentation, Balloon.html (online). You can also read the javadoc
comments that appear just above the class declaration and above each method declaration, which explain what each method does, what the method’s parameters are, and
what value – if any – is returned by the method. The html “help” pages are generated from these comments.

Don’t worry if you don’t understand the code. It will all be covered later. It is not necessary to know how a method works as long as you know what it does and how
to call it.

 Review declaring variables, creating objects, calling methods that return a value vs. “void” methods, and accessor and mutator methods before beginning.

To receive credit for this assignment, you must not modify the Balloon class in any way!
II. Your BalloonTester Class

Your BalloonTester class will have only a single method – main – and will perform each of the following operations, in the exact order listed below. Each operation
may be done in one or two statements. Make sure you follow directions faithfully, and note that once you have done step 3, you can copy and paste it to do steps 6, 9,
and 12.

1. Create a Balloon object with a name of your own choosing and an altitude of 100 meters.

2. Create a second Balloon object with a name of your own choosing, and specify an initial altitude of -100 meters.

3. Call the accessor methods of the Balloon class to get the name and altitude of each Balloon object. Print the data, one object per line.

4. Make the object you created in step 1 ascend to an altitude of 300 meters.

5. Call the adjustAltitude method to increase the altitude of the object you created in step 2 by 200 meters.

6. Call the accessor methods of the Balloon class to get the name and altitude of each object. Print the data, one object per line.

7. Call the adjustAltitude method to decrease the altitude of the object you created in step 1 by 150 meters.

8. Make the object you created in step 2 descend to the same altitude as the other object. You may assume that the other object is at a lower altitude.

To get credit for step 8., the statement(s) you write must always work, regardless of the actual altitude of the second object. It cannot depend on you knowing the
altitude of the second object, but must utilize the fact that the object knows its own altitude. In other words, if you use a literal to set the altitude, it is not
correct.

9. Call the accessor methods to get the name and altitude of each object. Print the data, one object per line.

10. Move the object you created in step 1 to an altitude that is three times its current altitude. As in step 8, the statement(s) you write must work for any
altitude and may not depend on you “figuring out” the new altitude beforehand.

11. Attempt to move the object you created in step 2 to an altitude that is 200 meters below its current altitude.

12. Call the accessor methods to get the name and altitude of each object. Print the data, one object per line.
III. What to Upload to Moodle

Upload a zip file containing

1. Your BalloonTester class
2. The output generated when the program runs

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