Lab 27

Hip to be Square

 

Objective:

 

Write two classes:  One class draws a square, and an exception that occurs when the user puts in an invalid dimension.

• First download the driver and put it in your project
• DO NOT ALTER THE DRIVER!
• Write a class file called DimensionException that inherits from Exception
• Create the following constructors
• Default – calls the parent’s constructor and pass a message that it is an invalid dimension
• A constructor that takes one string parameters that is passed to the parent’s constructor
• Write a class file called Square that DOES NOT HAVE  a main method
• An attribute of this class is
• Length – corresponding to the length of each side
• Create the following constructors
• Default – creates a 1x1 square (or a single star)
• One that has a integer parameter that corresponds to its length and width
• Accessors and Mutators for each variable
• MAKE SURE THE MUTATORS CHECK FOR VALID VALUES!
• If the dimension is set improperly throw the DimensionException
• Create the following Methods
• draw – this method will draw a square of asterisks (*) by the given dimensions. 
• getArea – returns the area of the square
• getPerimeter – returns the perimeter of the square

 

 

Example Dialog:

Welcome to the easy square program

Enter the length of the side of a square or enter QUIT to quit

5

*****

*****

*****

*****

*****

The area is 25

The perimeter is 20

Enter the length of the side of a square or enter QUIT to quit

0

Dimensions must be of length one at least

Enter the length of the side of a square or enter QUIT to quit

Lab Report Questions:

1. Describe what an exception does.
2. Describe the order in which a series of “catches” need to be.

Finally:

Upload DimensionException and Sqaure file to the dropbox