CS 1721 Laboratory 1

CS 1721 Laboratory 1
Testing a simple class hierarchy based on the Coin class

Objectives:

Become familiar with the rules and facilities.
Log in to your Windows and Unix accounts.
Set up your Windows and Unix accounts so that the passwords agree.
Use a Java development environment
Create and run a simple Java program using simple classes.

Hand-in Requirements:

Source code for Coin.java, Quarter.java, Dime.java, Nickel.java and Penny.java (15 pts)
Source code for CoinTester (5 pts)

All projects and laboratories will be submitted electronically through webCT under the Submissions menu. Zip up your entire project directory to submit as the source. (Right click on the project folder and follow the SentTo link.)

Overview:

The goal of this laboratory is for you to get your account set up and to understand how to run simple Java programs.http://www.cs.utsa.edu/~javalab/lab/accountlogin.html It is important that you get all account problems resolved in the first two weeks of class. You will have an account on the CS network that works on the Windows, Sun and Linux (Unix) machines in the Computer Science Laboratories. We will mainly be using Windows machines for this course. If your laboratory meets in the Java teaching laboratory (SB 3.02.02), you will need to log in to both your Windows and Unix accounts to change your passwords. If your lab does not meet in SB 3.02.02, you should go to SB 3.02.02 during open laboratory hours ( http://www.cs.utsa.edu/~javalab/lab/schedule.html) and reset your passwords. If you are unfamiliar with the system, please ask a tutor to help. The tutors are available to give you as much help as you need on the laboratories. Please ask for help if you are having trouble.

Part I: Running a simple project

This laboratory is based on the Coin class. The Coin class has a value and a name. You can find out the name or the value of a Coin. You can also find out whether or not the coin is equal. All of our classes will also have a toString method for debugging.

Create a new project called coinproject. Your presenter will take you through the steps for creating a simple JBuilder project called coinproject.

Select File -> New Project. Give the Name as coinproject (all lower case). If you are working in SB 3.02.02, the Directory should be Z:\working\java\coinproject. If your lab is being offered in one of the teaching classrooms, use c:\cs1723\yourname\coinproject. Press Finish. JBuilder will create an empty project.
Create a Coin class by selecting File -> New Class. Use Coin as the Class name. Pay attention to upper and lower case when you type, as Java is case-sensitive. JBuilder will create an empty class called Coin:

Add code to CoinTester to do the following tests. Create 2 objects of type Coin with different values, but the same names. Output their values using toString. Test to see whether they are equal.

Create a Quarter class that extends Coin and is specialized to represent quarters. Write test code for it.

Part II: On your own

Add the following code to CoinTester. In a loop which is repeated 10 times, create a new Coin object and assign it to the variable myCoin. Create each coin with name coin and value which is a random int value between 1 and 100. (Use the Random class with the nextInt method.) Print out each coin as it is created. After the loop print the maximum coin value, the minimum coin value and the average coin value. Do not use an array.

Add the Dime, Nickel and Penny classes to the coinproject. Add test code to CoinTester to create and compare various coins.