Project: Conical Frustum List2 with JUnit Tests

Description

Overview: This project consists of four classes: (1) ConicalFrustum is a class representing a
ConicalFrustum object; (2) ConicalFrustumTest class is a JUnit test class which contains one or more
test methods for each method in the ConicalFrustum class; (3) ConicalFrustumList2 is a class
representing a ConicalFrustum list object; and (4) ConicalFrustumList2Test class is a JUnit test class
which contains one or more test methods for each method in the ConicalFrustumList2 class. Note
that there is no requirement for a class with a main method in this project.
Since you will be modifying classes from the previous project, I strongly recommend that you
create a new folder for this project with a copy of your ConicalFrustum.java file and
ConicalFrustumList2.java file from the previous project.
You must create a jGRASP project and add your ConicalFrustum.java file and
ConicalFrustumList2.java file. With this project is open, your test files will be automatically
added to the project when they are created. You will be able to run all test files by clicking the
JUnit run button on the Open Projects toolbar.
New requirements and design specifications are underlined in the
descriptions below to help you identify them.
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• ConicalFrustum.java (a modification of the ConicalFrustum class in the previous project; new
requirements are underlined below)
Requirements: Create a ConicalFrustum class that stores the label, radius of top, radius of
bottom, and height where the radii and height are non-negative. The ConicalFrustum class also
includes methods to set and get each of these fields, as well as methods to calculate the volume,
slant height, lateral surface area, and total surface area of a ConicalFrustum object, and a method
to provide a String value that describes a ConicalFrustum object.
A Conical Frustum is a Frustum created by slicing the top off a cone (with the cut made parallel to
the base), forming a lower base and an upper base that are circular and parallel.
r1 radius of top
r2 radius of bottom
h height
s slant height
S lateral surface area
V volume
A total surface area
V = π ∗ h
3 (r*
+ + r+
+ + (r* ∗ r+))
s = /(r* − r+)+ + h+
S = π * (r1 + r2) * s
A = π * (r12 + r22 + (r1 + r2) * s)
Source for figures and formulas: https://www.calculatorsoup.com/images/frustum001.gif
Design: The ConicalFrustum class has fields, a constructor, and methods as outlined below.
(1) Fields (instance variables): label of type String, radius1 of type double, radius2 of type
double, and height of type double. Initialize the String to “” and the double
variables to 0 in their respective declarations. These instance variables should be private so
that they are not directly accessible from outside of the ConicalFrustum class, and these
should be the only instance variables (fields) in the class.
Class Variable – count of type int should be private and static, and it should be initialized to
zero.
(2) Constructor: Your ConicalFrustum class must contain a public constructor that accepts four
parameters (see types of above) representing the label, radius1, radius2, and height. Instead
of assigning the parameters directly to the fields, the respective set method for each field
(described below) should be called since they are checking the validity of the parameter. For
example, instead of using the statement label = labelIn; use the statement
setLabel(labelIn); Below are examples of how the constructor could be used to
create ConicalFrustum 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.
The constructor should increment the class variable count each time a ConicalFrustum is
constructed.
ConicalFrustum example1 = new ConicalFrustum(“Small”, 0.5, 0.75, 0.25);
ConicalFrustum example2 = new ConicalFrustum(” Medium “, 5.1, 10.2, 15.9);
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ConicalFrustum example3 = new ConicalFrustum(“Large”, 98.32, 199.0, 250.0);
(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 ConicalFrustum, which should each be public, are described below. See the
formulas in the figure above and the Code and Test section below for information on
constructing these methods.
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 “trimmed” String is set to the label field and the
method returns true. Otherwise, the method returns false and the label is not set.
o getRadius1: Accepts no parameters and returns a double representing the radius1
field.
o setRadius1: Takes a double parameter and returns a boolean. If the double
parameter is non-negative, then the parameter is set to the radius1 field and the method
returns true. Otherwise, the method returns false and the radius1 field is not set.
o getRadius2: Accepts no parameters and returns a double representing the radius2
field.
o setRadius2: Takes a double parameter and returns a boolean. If the double
parameter is non-negative, then the parameter is set to the radius2 field and the method
returns true. Otherwise, the method returns false and the radius2 field is not set.
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 parameter is non-negative, then the parameter is set to the height field and the
method returns true. Otherwise, the method returns false and the height field is not
set.
o volume: Accepts no parameters and returns the double value for the volume of the
ConicalFrustum. [Be sure to avoid integer division in your expression.]
o slantHeight: Accepts no parameters and returns the double value for the slant height
of the ConicalFrustum.
o lateralSurfaceArea: Accepts no parameters and returns the double value for
the lateral surface area of the ConicalFrustum. Be sure to call your slantHeight
method as appropriate.
o totalSurfaceArea: Accepts no parameters and returns the double value for the
total surface area of the ConicalFrustum. Be sure to call your slantHeight method as
appropriate.
o toString: Returns a String containing the information about the ConicalFrustum
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:
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volume(), slantHeight(), lateralSurfaceArea(), and
totallSurfaceArea(). Each line should have no trailing spaces (e.g., there should
be no spaces before a newline (\n) character). The toString value for example1,
example2, and example3 respectively are shown below (the blank lines are not part
of the toString values).
ConicalFrustum “Small” with radius1 = 0.5, radius2 = 0.75, and height = 0.25 has:
volume = 0.311 cubic units
slant height = 0.354 units
lateral surface area = 1.388 units
total surface area = 3.941 square units
ConicalFrustum “Medium” with radius1 = 5.1, radius2 = 10.2, and height = 15.9 has:
volume = 3,031.546 cubic units
slant height = 16.698 units
lateral surface area = 802.608 units
total surface area = 1,211.172 square units
ConicalFrustum “Large” with radius1 = 98.32, radius2 = 199.0, and height = 250.0 has:
volume = 18,020,568.788 cubic units
slant height = 269.512 units
lateral surface area = 251,739.485 units
total surface area = 406,518.914 square units
o getCount: A static method that accepts no parameters and returns an int representing
the static count field.
o resetCount: A static method that returns nothing, accepts no parameters, and sets the
static count field to zero.
o equals: An instance method that accepts a parameter of type Object and returns false if
the Object is a not a ConicalFrustum; otherwise, when cast to a ConicalFrustum, if it has
the same field values as the ConicalFrustum upon which the method was called, it returns
true; otherwise, it returns false. Note that this equals method with parameter type Object
will be called by the JUnit Assert.assertEquals method when two ConicalFrustum objects
are checked for equality.
Below is a version you are free to use.
public boolean equals(Object obj) {

if (!(obj instanceof ConicalFrustum)) {
return false;
}
else {
ConicalFrustum d = (ConicalFrustum) obj;
return (label.equalsIgnoreCase(d.getLabel())
&& Math.abs(radius1 – d.getRadius1()) < .000001
&& Math.abs(radius2 – d.getRadius2()) < .000001
&& Math.abs(height – d.getHeight()) < .000001);
}
}
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o hashCode(): Accepts no parameters and returns zero of type int. This method is
required by Checkstyle if the equals method above is implemented.
Code and Test: As you implement the methods in your ConicalFrustum class, you should compile it and
then create test methods as described below for the ConicalFrustumTest class.
• ConicalFrustumTest.java
Requirements: Create a ConicalFrustumTest class that contains a set of test methods to test each
of the methods in ConicalFrustum.
Design: Typically, in each test method, you will need to create an instance of ConicalFrustum,
call the method you are testing, and then make an assertion about the expected result and the
actual result (note that the actual result is commonly the result of invoking the method unless it
has a void return type). You can think of a test method as simply formalizing or codifying what
you have been doing in interactions to make sure a method is working correctly. That is, the
sequence of statements that you would enter in interactions to test a method should be entered
into a single test method. You should have at least one test method for each method in
ConicalFrustum, except for associated getters and setters which can be tested in the same method.
However, if a method contains conditional statements (e.g., an if statement) that results in more
than one distinct outcome, you need a test method for each outcome. For example, if the method
returns boolean, you should have one test method where the expected return value is false and
another test method that expects the return value to be true. Also, each condition in boolean
expression must be exercised true and false. Collectively, these test methods are a set of test
cases that can be invoked with a single click to test all of the methods in your ConicalFrustum
class.
Code and Test: Since this is the first project requiring you to write JUnit test methods, a good
strategy would be to begin by writing test methods for those methods in ConicalFrustum that you
“know” are correct. By doing this, you will be able to concentrate on the getting the test methods
correct. That is, if the test method fails, it is most likely due to a defect in the test method itself
rather the ConicalFrustum method being testing. As you become more familiar with the process
of writing test methods, you will be better prepared to write the test methods for the new methods
in ConicalFrustum. Be sure to call the ConicalFrustum toString method in one of your test cases
so that Web-CAT will consider the toString method to be “covered” in its coverage analysis.
Remember that you can set a breakpoint in a JUnit test method and run the test file in Debug
mode. Then, when you have an instance in the Debug tab, you can unfold it to see its values or
you can open a canvas window and drag items from the Debug tab onto the canvas.
• ConicalFrustumList2.java (a modification of the ConicalFrustumList2 class in the previous
project; new requirements are underlined below)
Requirements: Create a ConicalFrustumList2 class that stores the name of the list and an array
of ConicalFrustum objects. It also includes methods that return the name of the list, number of
ConicalFrustum objects in the ConicalFrustumList2, total surface area, total volume, average
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surface area, and average volume for all ConicalFrustum objects in the ConicalFrustumList2.
The toString method returns a String containing the name of the list followed by each
ConicalFrustum in the array, and a summaryInfo method returns summary information about the
list (see below).
Design: The ConicalFrustumList2 class has fields, a constructor, and methods as outlined below.
These instance variables should be private, and they should be the only instance variables (fields)
in the class.
(1) Fields (or instance variables): (1) a String representing the name of the list, (2) an array of
ConicalFrustum objects, and (3) an int representing the number of elements in the array of
ConicalFrustum objects. These are the only fields (or instance variables) that this class
should have.
(2) Constructor: Your ConicalFrustumList2 class must contain a constructor that accepts (1) a
parameter of type String representing the name of the list, (2) a parameter of type
ConicalFrustum[] representing the list of ConicalFrustum objects, and (3) ) a parameter
of type int representing the number of elements in the ConicalFrustum array. These
parameters should be used to assign the fields described above (i.e., the instance variables).
(3) Methods: The methods for ConicalFrustumList2 are described below.
o getName: Returns a String representing the name of the list.
o numberOfConicalFrustums: Returns an int representing the number of
ConicalFrustum objects in the ConicalFrustumList2. If there are zero ConicalFrustum
objects in the list, zero should be returned.
o totalSurfaceArea: Returns a double representing the total surface areas for all
ConicalFrustum objects in the list. If there are zero ConicalFrustum objects in the list,
zero should be returned.
o totalVolume: Returns a double representing the total volumes for all ConicalFrustum
objects in the list. If there are zero ConicalFrustum objects in the list, zero should be
returned.
o averageSurfaceArea: Returns a double representing the average for the total
surface area for all ConicalFrustum objects in the list. If there are zero ConicalFrustum
objects in the list, zero should be returned.
o averageVolume: Returns a double representing the average volume for all
ConicalFrustum objects in the list. If there are zero ConicalFrustum 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 ConicalFrustum in the list. In the process of creating the return result,
this toString() method should include a while loop that calls the toString() method for
each ConicalFrustum object in the list (adding a \n before and after each). Be sure to
include appropriate newline escape sequences. For an example, see lines 3 through 21 in
the output from ConicalFrustumListApp (previous project) for the
ConicalFrustum_data_1.txt input file. [Note that the toString result should not include
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the summary items in lines 24 through 29 of the example. These lines represent the
return value of the summaryInfo method below which will be called from main.]
o summaryInfo: Returns a String (does not begin or end 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 ConicalFrustums, 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 24 through 29 in the output below from
ConicalFrustumList2App for the ConicalFrustum_data_1.txt input file. The second
example below shows the output from ConicalFrustumList2App for the
ConicalFrustum_data_0.txt input file which contains a list name but no ConicalFrustum
data.
o getList: Returns the array of ConicalFrustum objects (the second field above).
o readFile: Takes a String parameter representing the file name, reads in the file,
storing the list name and creating an array of ConicalFrustum objects, uses the list name
the array, and the number of ConicalFrustum objects in the array to create a new
ConicalFrustumList2 object, and then returns the ConicalFrustumList2 object. See note
#2 under Important Considerations for the ConicalFrustumList2MenuApp class to see
how this method should be called.
o addConicalFrustum: Returns nothing but takes four parameters (label, radius1,
radius2, and height), creates a new ConicalFrustum object, and adds it to the
ConicalFrustumList2 object.
o findConicalFrustum: Takes a label of a ConicalFrustum as the String parameter
and returns the corresponding ConicalFrustum object if found in the ConicalFrustumList2
object; otherwise returns null. Letter case should be ignored when attempting to match
the label (e.g., “Small Example” and “sMaLL EXAMPLE” should be a match).
o deleteConicalFrustum: Takes a String as a parameter that represents the label of
the ConicalFrustum. Returns the ConicalFrustum object if it is found in the
ConicalFrustumList2 and deleted; otherwise returns null. Letter case should be ignored
when attempting to match the label; consider calling/using findConicalFrustum in
this method. When an element is deleted from an array, elements to the right of the
deleted element must be shifted to the left. After shifting the items to the left, the last
ConicalFrustum element in the array should be set to null. Finally, the number of
elements field must be decremented.
o editConicalFrustum: Takes four parameters (label, radius1, radius2, and height),
uses the label to find the corresponding the ConicalFrustum object. If found, sets the
radius1, radius2, and height to the values passed in as parameters, and returns true. If not
found, returns false.
New method for this Project
o findConicalFrustumWithLeastHeight: Returns the ConicalFrustum with the
least height; if the list contains no ConicalFrustum objects, returns null.
o findConicalFrustumWithGreatestHeight: Returns the ConicalFrustum with
the greatest height; if the list contains no ConicalFrustum objects, returns null.
o findConicalFrustumWithLeastVolume: Returns the ConicalFrustum with the
least or smallest volume; if the list contains no ConicalFrustum objects, returns null.
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o findConicalFrustumWithGreatestVolume: Returns the ConicalFrustum with
the greatest volume; if the list contains no ConicalFrustum objects, returns null.
Code and Test: Remember to import java.util.Scanner, java.io.File, java.io.IOException. These
classes will be needed in the readFile method which will require a throws clause for IOException.
Some of the methods above require that you use a loop to go through the objects in the array.
You may want to implement the class below in parallel with this one to facilitate testing. That is,
after implementing one to the methods above, you can implement the corresponding test method
in the test file described below.
• ConicalFrustumList2Test.java
Requirements: Create a ConicalFrustumList2Test class that contains a set of test methods to test
each of the methods in ConicalFrustumList2.
Design: Typically, in each test method, you will need to create an instance of
ConicalFrustumList2, call the method you are testing, and then make an assertion about the
expected result and the actual result (note that the actual result is usually the result of invoking
the method unless it has a void return type). You can think of a test method as simply
formalizing or codifying what you have been doing in interactions to make sure a method is
working correctly. That is, the sequence of statements that you would enter in interactions to test
a method should be entered into a single test method. You should have at least one test method
for each method in ConicalFrustumList2. However, if a method contains conditional statements
(e.g., an if statement) that results in more than one distinct outcome, you need a test method for
each outcome. For example, if the method returns boolean, you should have one test method
where the expected return value is false and another test method that expects the return value to
be true. Also, each condition in boolean expression must be exercised true and false.
Collectively, these test methods are a set of test cases that can be invoked with a single click to
test all of the methods in your ConicalFrustumList2 class.
Code and Test: Since this is the first project requiring you to write JUnit test methods, a good
strategy would be to begin by writing test methods for those methods in ConicalFrustumList2 that
you “know” are correct. By doing this, you will be able to concentrate on the getting the test
methods correct. That is, if the test method fails, it is most likely due to a defect in the test
method itself rather the ConicalFrustumList2 method being testing. As you become more
familiar with the process of writing test methods, you will be better prepared to write the test
methods for the new methods in ConicalFrustumList2. Be sure to call the ConicalFrustumList2
toString method in one of your test cases so that Web-CAT will consider the toString method to
be “covered” in its coverage analysis. Remember that you can set a breakpoint in a JUnit test
method and run the test file in Debug mode. Then, when you have an instance in the Debug tab,
you can unfold it to see its values or you can open a canvas window and drag items from the
Debug tab onto the canvas.
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Important: When comparing two arrays for equality in JUnit, be sure to use
Assert.assertArrayEquals rather than Assert.assertEquals. Assert.assertArrayEquals will return
true only if the two arrays are the same length and the elements are equal based on an element by
element comparison using the appropriate equals method.
Web-CAT
Assignment Part A – submit: ConicalFrustum.java, ConicalFrustumTest.java
Assignment Part B – submit: ConicalFrustum.java, ConicalFrustumTest.java,
ConicalFrustumList2.java, and ConicalFrustumList2Test.java.
Note that data files ConicalFrustum_data_1.txt and ConicalFrustum_data_0.txt are available in Web-CAT
for you to use in your test methods. If you want to use your own data files, they should have a .txt
extension, and they should be included with submission to Web-CAT (i.e., just add the .txt data file to
your jGRASP project in the Source Files category).
Web-CAT will use the results of your test methods and their level of coverage of your source files as
well as the results of our reference correctness tests to determine your grade.