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Project: PentagonalPyramid List App Page 1 of 7
Page 1 of 7
Deliverables
Your project files should be submitted to Web-CAT by the due date and time specified. You may
submit your files to the skeleton code assignment until the project due date but should try to do this
much earlier. The skeleton code assignment is ungraded, but it checks that your classes and methods
are named correctly and that methods and parameters are correctly typed. The files you submit to
skeleton code assignment may be incomplete in the sense that method bodies have at least a return
statement if applicable or they may be essentially completed files. In order to avoid a late penalty for
the project, you must submit your completed code files to Web-CAT no later than 11:59 PM on the
due date for the completed code. If you are unable to submit via Web-CAT, you should e-mail your
files in a zip file to your TA before the deadline.
Files to submit to Web-CAT (all three files must be submitted together):
• PentagonalPyramid.java
• PentagonalPyramidList.java
• PentagonalPyramidListApp.java
Specifications
Overview: You will write a program this week that is composed of three classes: the first class
defines PentagonalPyramid objects, the second class defines PentagonalPyramidList objects, and the
third, PentagonalPyramidListApp, reads in a file name entered by the user then reads the list name
and PentagonalPyramid data from the file, creates PentagonalPyramid objects and stores them in an
ArrayList, creates a PentagonalPyramidList object with the list name and ArrayList, prints the
PentagonalPyramidList object, and then prints summary information about the
PentagonalPyramidList object.
A PentagonalPyramid has a pentagon base and five isosceles triangle faces, six vertices, and 10 edges as
depicted below with base edge length a and height h. The formulas are provided to assist you in computing
return values for the respective methods in the PentagonalPyramid class described in this project.
Ref: Do a “Google” search on “pentagonal pyramid surface area” for details and an interactive solver.
Surface Area
(A)
Volume (V)
Edge length
(a)
Height (h)
Project: PentagonalPyramid List App Page 2 of 7
Page 2 of 7
• PentagonalPyramid.java (assuming that you successfully created this class in Project 4, just
copy the file to your new Project 5 folder and go on to PentagonalPyramidList.java on page
4. Otherwise, you will need to create PentagonalPyramid.java as part of this project.)
Requirements: Create a PentagonalPyramid class that stores the label, base edge (i.e., length of
an edge in the pentagonal base), and height. The base edge and height must be greater than zero.
The PentagonalPyramid class also includes methods to set and get each of these fields, as well as
methods to calculate the surface area and volume of a PentagonalPyramid object, and a method to
provide a String value of a PentagonalPyramid object (i.e., a class instance).
Design: The PentagonalPyramid class has fields, a constructor, and methods as outlined below.
(1) Fields (instance variables): label of type String, base edge of type double, and height of type
double. Initialize the String to “” and the double to 0 in their respective declarations. These
instance variables should be private so that they are not directly accessible from outside of the
PentagonalPyramid class, and these should be the only instance variables in the class.
(2) Constructor: Your PentagonalPyramid class must contain a public constructor that accepts
three parameters (see types of above) representing the label, base edge, height. Instead of
assigning the parameters directly to the fields, the respective set method for each field
(described below) should be called. For example, instead of the statement label =
labelIn; use the statement setLabel(labelIn); Below are examples of how the
constructor could be used to create PentagonalPyramid objects. Note that although String
and numeric literals are used for the actual parameters (or arguments) in these examples,
variables of the required type could have been used instead of the literals.
PentagonalPyramid ex1 = new PentagonalPyramid(“Ex 1″, 1, 2);
PentagonalPyramid ex2 = new PentagonalPyramid(” Ex 2 “, 12.3, 25.5);
PentagonalPyramid ex3 = new PentagonalPyramid(“Ex 3”, 123.4, 900);
(3) Methods: Usually a class provides methods to access and modify each of its instance
variables (known as get and set methods) along with any other required methods. The
methods for PentagonalPyramid, which should each be public, are described below. See
formulas in Code and Test below.
o getLabel: Accepts no parameters and returns a String representing the label field.
o setLabel: Takes a String parameter and returns a boolean. If the string parameter is
not null, then the label field is set to the “trimmed” String and the method returns true.
Otherwise, the method returns false and the label field is not set.
o getBaseEdge: Accepts no parameters and returns a double representing the base edge
field.
o setBaseEdge: Accepts a double parameter and returns a boolean as follows. If the
double is greater than zero, sets the base edge field to the double passed in and returns
true. Otherwise, the method returns false and does not set the base edge field.
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o getHeight: Accepts no parameters and returns a double representing the height field.
o setHeight: Accepts a double parameter and returns a boolean as follows. If the
double is greater than zero, sets the height field to the double passed in and returns true.
Otherwise, the method returns false and does not set the height field.
o surfaceArea: Accepts no parameters and returns the double value for the total
surface area calculated using formula above and the values of the base edge and height
fields. See code and test below regarding the Math.tan(x) method.
o volume: Accepts no parameters and returns the double value for the volume calculated
using formula above and the values of the base edge and height fields.
o toString: Returns a String containing the information about the PentagonalPyramid
object formatted as shown below, including decimal formatting (“#,##0.0######”)
for the double values. Newline and tab escape sequences should be used to achieve the
proper layout. In addition to the field values (or corresponding “get” methods), the
following methods should be used to compute appropriate values in the toString
method: surfaceArea() and volume(). Each line should have no trailing spaces
(e.g., there should be no spaces before a newline (\n) character). The toString value
for ex1, ex2, and ex3 respectively are shown below (the blank lines are not part of the
toString values).
PentagonalPyramid “Ex 1” with base edge = 1.0 and height = 2.0 units has:
surface area = 7.008203 square units
volume = 1.1469849 cubic units
PentagonalPyramid “Ex 2” with base edge = 12.3 and height = 25.5 units has:
surface area = 1,086.4892066 square units
volume = 2,212.4737204 cubic units
PentagonalPyramid “Ex 3” with base edge = 123.4 and height = 900.0 units has:
surface area = 305,081.9691528 square units
volume = 7,859,601.8538338 cubic units
Code and Test: Math.tan(x) expects x to be in radians rather than degrees. In the formula, 54
degrees can be converted to radians using Math.toRadians(54). The following combines the two
methods: Math.tan(Math.toRadians(54))
As you implement your PentagonalPyramid class, you should compile it and then test it using
interactions. For example, as soon you have implemented and successfully compiled the
constructor, you should create instances of PentagonalPyramid in interactions (e.g., copy/paste
the examples above). Remember that when you have an instance on the workbench, you can
unfold it to see its values. You can also open a viewer canvas window and drag the instance from
the Workbench tab to the canvas window. After you have implemented and compiled one or
more methods, create a PentagonalPyramid object in interactions and invoke each of your
methods on the object to make sure the methods are working as intended. You may find it useful
to create a separate class with a main method that creates an instance of PentagonalPyramid then
prints it out. This would be similar to the PentagonalPyramidApp class you created in the
previous project, except that in the PentagonalPyramidApp class you read in the values and then
created and printed the object.
Project: PentagonalPyramid List App Page 4 of 7
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• PentagonalPyramidList.java
Requirements: Create an PentagonalPyramidList class that stores the name of the list and an
ArrayList of PentagonalPyramid objects. It also includes methods that return the name of the list,
number of PentagonalPyramid objects in the PentagonalPyramidList, total surface area, total
volume, average surface area, and average volume for all PentagonalPyramid objects in the
PentagonalPyramidList. The toString method returns a String containing the name of the list
followed by each PentagonalPyramid in the ArrayList, and a summaryInfo method returns
summary information about the list (see below).
Design: The PentagonalPyramidList class has two fields, a constructor, and methods as outlined
below.
(1) Fields (or instance variables): (1) a String representing the name of the list and (2) an
ArrayList of PentagonalPyramid objects. These are the only fields (or instance variables) that
this class should have, and both should be private.
(2) Constructor: Your PentagonalPyramidList class must contain a constructor that accepts a
parameter of type String representing the name of the list and a parameter of type ArrayList<
PentagonalPyramid> representing the list of PentagonalPyramid objects. These parameters
should be used to assign the fields described above (i.e., the instance variables).
(3) Methods: The methods for PentagonalPyramidList are described below.
o getName: Returns a String representing the name of the list.
o numberOfPentagonalPyramids: Returns an int representing the number of
PentagonalPyramid objects in the PentagonalPyramidList. If there are zero
PentagonalPyramid objects in the list, zero should be returned.
o totalSurfaceArea: Returns a double representing the total surface areas for all
PentagonalPyramid objects in the list. If there are zero PentagonalPyramid objects in the
list, zero should be returned.
o totalVolume: Returns a double representing the total volumes for all
PentagonalPyramid objects in the list. If there are zero PentagonalPyramid objects in the
list, zero should be returned.
o averageSurfaceArea: Returns a double representing the average surface area for
all PentagonalPyramid objects in the list. If there are zero PentagonalPyramid objects in
the list, zero should be returned.
o averageVolume: Returns a double representing the average volume for all
PentagonalPyramid objects in the list. If there are zero PentagonalPyramid objects in the
list, zero should be returned.
o toString: Returns a String (does not begin with \n) containing the name of the list
followed by each PentagonalPyramid in the ArrayList. In the process of creating the
return result, this toString() method should include a while loop that calls the toString()
method for each PentagonalPyramid object in the list (adding a \n before and after each).
Be sure to include appropriate newline escape sequences. For an example, see lines 2
through 19 in the output below from PentagonalPyramidListApp for the
PentagonalPyramid_data_1.txt input file. [Note that the toString result should not
Project: PentagonalPyramid List App Page 5 of 7
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include the summary items in lines 20 through 26 of the example. These lines represent
the return value of the summaryInfo method below.]
o summaryInfo: Returns a String (does not begin with \n) containing the name of the
list (which can change depending of the value read from the file) followed by various
summary items: number of PentagonalPyramid objects, total surface area, total volume,
average surface area, and average volume. Use “#,##0.0##” as the pattern to format the
double values. For an example, see lines 20 through 26 in the output below from
PentagonalPyramidListApp for the PentagonalPyramid_data_1.txt input file. The
second example below shows the output from PentagonalPyramidListApp for the
PentagonalPyramid_data_0.txt input file which contains a list name but no
PentagonalPyramid data.
Code and Test: Remember to import java.util.ArrayList. The each of the last five methods
above requires that you use a loop (i.e., a while loop) to retrieve each object in the ArrayList. As
you implement your PentagonalPyramidList class, you can compile it and then test it using
interactions. However, it may be easier to create a class with a simple main method that creates a
PentagonalPyramidList object and calls its methods.
• PentagonalPyramidListApp.java
Requirements: Create an PentagonalPyramidListApp class with a main method that reads in the
name of the data file entered by the user and then reads list name and PentagonalPyramid data
from the file, creates PentagonalPyramid objects, stores them in a local ArrayList of
PentagonalPyramid objects, creates a PentagonalPyramidList object with the name of the list and
the ArrayList of PentagonalPyramid objects, and then prints the PentagonalPyramidList object
followed summary information about the PentagonalPyramidList object. All input and output
for this project must be done in the main method.
• Design: The main method should prompt the user to enter a file name, and then it should read in
the data file. The first record (or line) in the file contains the name of the list. This is followed by
the data for the PentagonalPyramid objects. After each set of PentagonalPyramid data is read in,
a PentagonalPyramid object should be created and stored in the local ArrayList of
PentagonalPyramid objects. After the file has been read in and the ArrayList has been populated,
the main method should create a PentagonalPyramidList object with the name of the list and the
ArrayList of PentagonalPyramid objects as parameters in the constructor. It should then print the
PentagonalPyramidList object, then print the summary information about the
PentagonalPyramidList (i.e., print the value returned by the summaryInfo method for the
PentagonalPyramidList). The output from two runs of the main method in
PentagonalPyramidListApp is shown below. The first is produced after reading in the
PentagonalPyramid_data_1.txt file, and the second is produced after reading in the
PentagonalPyramid_data_0.txt file. Your program output should be formatted exactly as shown.
Project: PentagonalPyramid List App Page 6 of 7
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Program output
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—-jGRASP exec: java PentagonalPyramidListApp
Enter file name: PentagonalPyramid_data_1.txt
PentagonalPyramid Test List
PentagonalPyramid “Ex1” with base edge = 1.0 and height = 2.0 units has:
surface area = 7.008203 square units
volume = 1.1469849 cubic units
PentagonalPyramid “Ex 2” with base edge = 12.3 and height = 25.5 units has:
surface area = 1,086.4892066 square units
volume = 2,212.4737204 cubic units
PentagonalPyramid “Ex 3” with base edge = 123.4 and height = 900.0 units has:
surface area = 305,081.9691528 square units
volume = 7,859,601.8538338 cubic units
—– Summary for PentagonalPyramid Test List —–
Number of PentagonalPyramid: 3
Total Surface Area: 306,175.467
Total Volume: 7,861,815.475
Average Surface Area: 102,058.489
Average Volume: 2,620,605.158
—-jGRASP: operation complete.
Line # Program output
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—-jGRASP exec: java PentagonalPyramidListApp
Enter file name: PentagonalPyramid_data_0.txt
PentagonalPyramid Empty Test List
—– Summary for PentagonalPyramid Empty Test List —–
Number of PentagonalPyramid: 0
Total Surface Area: 0.0
Total Volume: 0.0
Average Surface Area: 0.0
Average Volume: 0.0
—-jGRASP: operation complete.
Code: Remember to import java.util.ArrayList, java.util.Scanner, and java.io.File, and
java.io.FileNotFoundException prior to the class declaration. Your main method declaration
should indicate that main throws FileNotFoundException. After your program reads in
the file name from the keyboard, it should read in the data file using a Scanner object that was
created on a file using the file name entered by the user.
… = new Scanner(new File(fileName));
You can assume that the first line in the data file is the name of the list, and then each set of three
lines contains the data from which a PentagonalPyramid object can be created. After the name of
the list has been read and assigned to a local variable, a while loop should be used to read in the
PentagonalPyramid data. The boolean expression for the while loop should be
Project: PentagonalPyramid List App Page 7 of 7
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(_________.hasNext()) where the blank is the name of the Scanner you created on the file.
Each iteration through the loop reads three lines. As each of the lines is read from the file, the
respective local variables for the PentagonalPyramid data items (label, baseEdge, and height)
should be assigned, after which the PentagonalPyramid object should be created and added to a
local ArrayList of PentagonalPyramid objects. The next iteration of the loop should then read the
next set of three lines then create the next PentagonalPyramid object and add it to the local
ArrayList of PentagonalPyramid objects, and so on. After the file has been processed (i.e., when
the loop terminates after the hasNext method returns false), name of the list and the ArrayList of
PentagonalPyramid objects should be used to create an PentagonalPyramidList object. The list
should be printed by printing a leading \n and the PentagonalPyramidList object. Finally, the
summary information is printed by printing a leading \n and the value returned by the
summaryInfo method invoked on the PentagonalPyramidList object.
Test: You should test your program minimally (1) by reading in the
PentagonalPyramid_data_1.txt input file, which should produce the first output above, and (2) by
reading in the PentagonalPyramid_data_0.txt input file, which should produce the second output
above. Although your program may not use all of the methods in PentagonalPyramidList and
PentagonalPyramid, you should ensure that all of your methods work according to the
specification. You can either user interactions in jGRASP or you can write another class and
main method to exercise the methods. Web-CAT will test all methods to determine your project
grade.
General Notes
1. All input from the keyboard and all output to the screen should done in the main method.
Only one Scanner object on System.in should be created and this should be done in the main
method. All printing (i.e., using the System.out.print and System.out.println methods) should
be in the main method. Hence, none of your methods in the PentagonalPyramid class should
do any input/output (I/O).
2. Be sure to download the test data files (PentagonalPyramid_data_1.txt and
PentagonalPyramid_data_0.txt) and store them in same folder as your source files. It may be
useful examine the contents of the data files. Find the data files in the jGRASP Browse tab
and then open each data file in jGRASP to see the items that your program will be reading
from the file. Be sure to close the data files without changing them.

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