CSCI 202 in-class lab 1

Creating the project

Start your favorite IDE.

Create a project with a name of your choosing.

Start by creating a Java application (a class with a main method) with the class name TestDriver within the package edu.unca.cs.csci202 .

Have your main method print something like "Today it will snow!".

Creating a second class

Create a second class, called Place, within the same package.

Place is a subclass of Object, so you do not need to use extends.

Place has no public fields.

Place has four public methods.

Be sure to define fields to contain the name and state for Place. Initialize both fields to "".

In the terminology of object-oriented programming, the “get” methods are known at accessor, or getter, methods and the the “get” methods are known at mutator, or setter, methods.

Using the new class

Go back to TestDriver

Add code to create a variable hazelwood Set the name of hazelwood to "Hazelwood" and the state to "NC".

Use System.out.println to print the value of hazelwood. (The default toString will be used.)

Go back to Place and add a constructor that takes two arguments, Strings corresponding to name and state, in that order.

Return to TestDriver. Oops, looks like a problem with the constructor used to create hazelwood. Java provides its own default constructor until you define one of your own. Then Java takes the old one away. That is strange.

So, add a default constructor and, just for fun, call the this constructor to initialize both fields to "".

Now TestDriver is happy.

Use your new constructor to create a Place variable frogLevel with name "Frog Level" and state "NC". And, again use System.out.println to print frogLevel.

Examining the modifiers

If you are using NetBeans, select in the Projects tab and take a look at the Member View in the lower left corner.

Notice the little icons in front of constructor, method, and field names.

Change the access modifiers in front of the members (choices are public, private, and protected) and see how the icons are changed.


Override the toString method so that the Place object will return values similar to "Frog Level, NC".