Model a real-life object as a Java class with at least one attribute and an instance method. Write a main method to create an instance of

Assignment 1

Object and Instance

Before attempting this assignment, be sure you have completed all the reading assignments, non-

graded exercises, discussions, and assignments to date.

Overview This assignment consists of two classes that will be implemented. A Weight.java class that has

three private variables, two private methods and four public methods and a Project.java class

that has three private methods. The goal of this assignment is to perform calculations using

Weight objects (instances of Weight class).

Weight Class Weight class should have three private variables, two private methods and four public methods.

Variables

Hint: How should/can you access these private variables?

1. A private constant variable called OUNCES_IN_A_POUND that defines the number of ounces in a pound (16).

2. A private variable called pounds with a data type of integer.

3. A private variable called ounces with a data type of double.

Methods

1. A public parameterized constructor, which initializes the private variables.

public Weight (int pounds, double ounces){ // implementation

}

2. A private instance method called toOunces with a return type of double. This method has no parameters and should return the total number of ounces. For full credit, reuse this method

across other methods when possible.

3. A private instance method called normalize with a return type of void. This method has no parameters and should ensure that the number of ounces is less than the number of ounces in a

pound. For full credit, reuse this method across other methods when possible.

4. A public instance method called lessThan with a return type of boolean. This method should accept a Weight object as a parameter and determine if the object is greater or less than

the initialized values.

public boolean lessThan (Weight weight){ // implementation

}

5. A public instance method called addTo with a return type of void. This method should accept a Weight object as a parameter and add the object’s weight values to the initialized

values.

public void addTo (Weight weight){ // implementation

}

6. A public instance method called toString with a return type of String. This method has no parameters and should have the following format:

x pounds and y ounces

where x is the number of pounds and y the number of ounces. Ounces should be

displayed with two decimal places.

Project1 Class Project1 class should have three private methods and one public method.

Methods

1. A private class method named findMinimum with a return type of Weight. This method should accept three Weight objects as parameters and compare each Weight object’s

weight values to find the minimum. The Weight object with the minimum weight value

should be returned and then printed using toString in the following format:

The minimum weight is x pounds and y ounces

where x is the number of pounds and y the number of ounces. Ounces should be

displayed with two decimal places.

2. A private class method named findMaximum with a return type of Weight. This method should accept three Weight objects as parameters and compare each Weight object’s weight

values to find the maximum. The Weight object with the maximum weight value should be

returned and then printed using toString in the following format:

The maximum weight is x pounds and y ounces

where x is the number of pounds and y the number of ounces. Ounces should be

displayed with two decimal places.

3. A private class method named findAverage with a return type of Weight. This method should accept three Weight objects as parameters and calculate the average weight value. A new

Weight object with the average weight values should be returned and then printed using toString

in the following format:

The average weight is x pounds and y ounces

where x is the number of pounds and y the number of ounces. Ounces should be

displayed with two decimal places.

4. A public method named main with a return type of void. This method should exercise the correct functionality of findMinimum, findMaximum and findAverage by creating three

Weight objects using the hardcoded values below:

Weight weight1 = new Weight(11, 3); Weight weight2 = new Weight(7, 20); // Hint: normalize method should be used to translate into 8 pounds and 4 ounces Weight weight3 = new Weight(14, 6);

Submission Requirements

Style and Documentation Make sure your Java program is using the recommended style such as:

• Javadoc comment with your name as author, date, and brief purpose of the program

• Comments for variables and blocks of code to describe major functionality

• Meaningful variable names and prompts

• Class names are written in upper CamelCase

• Constants are written in All Capitals

• Use proper spacing and empty lines to make code human readable

Deliverables The submission requires uploading a single zip file, which will contain:

1. The source code of Weight.java (do not include the class file) 2. The source code of Project1.java (do not include the class file) 3. A single document (DOC/DOCX or PDF), which includes the test case(s) in a tabular

format and screenshot(s) of the test runs for the test case(s). Do not submit the

screenshot(s) separately as they should be included in this document. Below is an

example of a test case table to follow:

Test # Input Values

(Values as Input)

Expected Output Actual

Output

Pass or

Fail

(What is Expected as

Result)

(Output

obtained by

code

execution)

(If test

passed or

failed)

Test 1 Weight weight1 =

new Weight(11, 3)

Weight weight2 =

new Weight(7, 20)

Weight weight3 =

new Weight(14, 6)

Created weight1 with 11

pounds and 8 ounces

Created weight2 with 8

pounds and 4 ounces

Created weight3 with 14

pounds and 6 ounces

Screenshot(s)

of the Output

(Result

obtained by

executing the

code)

Include the screenshot(s) here

Grading Rubric Criteria Level 3 Level 2 Level 1

Weight

class

(31-40 points)

Implemented the

specifications and logic

components

(21-30 points)

Not implemented some of

the logic and specification

components

(0-20 points)

Not implemented most

of the logic and

specification

components

Project1

class

(31-40 points)

Implemented the

specifications and logic

components

(21-30 points)

Not implemented some of

the logic and specification

components

(0-20 points)

Not implemented most

of the logic and

specification

components

Test

cases

(11-20 points)

Included the test cases

with the screen shot(s)

using the tabular format

(6 – 10 points)

Not included some of the

test case using the screen

shot(s) using the tabular

format

(0 – 5 points)

Not included most of

the test cases with the

screen shot(s)

Assignment 2: Inheritance and Encapsulation

Before attempting this project, be sure you have completed all the reading assignments, non-graded

exercises, discussions, and assignments to date.

Design and implement Java program as follows:

(1) There will be a Snack class with following attributes: id (combination of numbers and letters),

size (values S, M, or L), and price

(2) There will be two child classes FruitSnack and SaltySnack with the following additional

attributes:

o FruitSnack: It includes citrus fruit indication (value of this variable of is true or false)

o SaltySnack: It includes nut snack indication (value of this variable of is true or false)

(3) The Snack class hierarchy must provide the following functionality:

• On creation, a snack instance must be given all attribute values except its price, which must be calculated

• Price is calculated as follows: o There is a flat fee of $19.99 for S snack, $29.99 for M snack, and $39.99 for L snack.

o FruitSnack has an additional fee of $5.99 when it has a citrus fruit. Please add

only a single citrus fruit, and no preventing coding is required to limit adding more

than one.

o SaltySnack has an additional fee of $4.50 when it has a nut snack. Please add

only a single nut snack no preventing coding is required to limit adding more than

one.

• Each class must have a method to return or display the class’s values to the console

(4) Implement OrderSystem class with main method with following functionality:

o Order a snack and after ordering it will display the snack type, its size, id and price

o Exit program

(5) Your classes must be coded with correct encapsulation: private/protected attributes, get methods,

and set methods

(6) There should be appropriate overloading and overriding methods

(7) OrderSystem should take advantage of the inheritance properties (e.g., use Snack variable

regardless which snack instance as appropriate)

(8) The prices for S, M, L, citrus fruit, nut snack can be hard coded in the program.

Style and Documentation:

Make sure your Java program is using the recommended style such as:

• Javadoc comment with your name as author, date, and brief purpose of the program

• Comments for variables and blocks of code to describe major functionality

• Meaningful variable names and prompts

• Class names are written in upper CamelCase

• Constants are written in All Capitals

• Use proper spacing and empty lines to make code human readable

Capture execution:

You must capture the screen shots of running the code for different test scenarios and include the

screen shots of the test runs in the documentation. The following is a sample of a few of the test

scenarios for you to follow, and you can add more. Any variation with the menu shown below, or any

change in the language of the display or the display format for the menu for a justified reason is

accepted.

In the test scenarios the symbol of question mark ( ?) means that is the value your program will

compute. For example, your program will display the value of id, that is noted as ?

Your program will compute the value of the price and display it, and that is also indicated as ?.

Test Scenario 1: MENU 1: Order a Snack 2: Exit program Enter your selection: 2 Thank you for using the program. Goodbye!

Test Scenario 2: MENU 1: Order a Snack 2: Exit program Enter your selection: 1 Do you want Fruit Snack (1) or Salty Snack (2): 1 What size do you want: S, M, or L: S Do you want citrus fruit included? true/false: true You have chosen snack type = Fruit Snack, of type = S, id = ? and price = ?

Test Scenario 3: MENU 1: Order a Snack 2: Exit program Enter your selection: 1 Do you want Fruit Snack (1) or Salty Snack (2): 1 What size do you want: S, M, or L: M Do you want citrus fruit included? true/false: false You have chosen snack type = Fruit Snack, of type = M, id = ? and price = ?

Test Scenario 4: MENU 1: Order a Snack 2: Exit program Enter your selection: 1 Do you want Fruit Snack (1) or Salty Snack (2): 1 What size do you want: S, M, or L: L Do you want citrus fruit included? true/false: false You have chosen snack type = Fruit Snack, of type = L, id = ? and price = ?

Test Scenario 5: MENU 1: Order a Snack 2: Exit program Enter your selection: 1 Do you want Fruit Snack (1) or Salty Snack (2): 2 What size do you want: S, M, or L: S Do you want nut snack included? true/false: true You have chosen snack type = Salty Snack, of type = S, id = ? and price = ?

Test Scenario 6: MENU 1: Order a Snack 2: Exit program Enter your selection: 1 Do you want Fruit Snack (1) or Salty Snack (2): 2 What size do you want: S, M, or L: M Do you want nut snack included? true/false: false You have chosen snack type = Salty Snack, of type = M, and id = ? and price = ?

Submission Requirements:

Deliverables include Java program (.java files) and a single documentation including the screen shots

of the test runs either as a Microsoft Word file, or as a PDF. The Java and Word/PDF files should be

named appropriately for the assignment (as indicated in the Submission Requirements document.

The word (or PDF) document should include screen captures showing the successful compiling and

running of each of the test scenario. Test scenarios should include all required functionality of the

program. Each screen capture should be properly labeled clearly indicated what the screen capture

represents. Do not submit the screen shots of the test runs separately as image files but include

(embed) them in the document and finally submit a single document.

Grading Rubric:

The following grading rubric will be used to determine your grade:

Criteria Level 3 Level 2 Level 1

The Snack hierarchy

classes (21-30 points)

Correct or almost

correct attributes and

inheritance structure

(11-20 points)

Mistakes in

implementation

(0-10 points)

Missing or

significantly incorrect

implementation

Encapsulation (21-30 points)

Correct or almost

correct code for

encapsulation

(11-20 points)

Mistakes in

implementation

(0-10 points)

Missing or

significantly incorrect

implementation

Calculation (8-10 points)

Correct or almost

correct code to

calculate price using

overriding

(6-7 points)

Mistakes in

implementation

(0-5 points)

Missing or

significantly incorrect

implementation

Test cases (11-15 points)

Correct or almost

correct code to meet

required functionality

(6-10 points)

Mistakes in

implementation

(0-5 points)

Missing or

significantly incorrect

implementation

Program

documentation and

style, screen captures

(11-15 points)

Correct or almost

correct menu,

program comments,

(6-10 points)

Mistakes or

incomplete menu,

documentation and/or

(0-5 points)

Missing or

significantly incorrect

menu, documentation

identifiers, and screen

captures

style, and screen

captures

and/or style, or screen

captures

Assignment 3

GUI & Polymorphism

Before attempting this project, be sure you have completed all the reading assignments, non- graded exercises, discussions, and assignments to date.

Design and implement Java program as follows:

1) Implement converter class hierarchy as follows: a. Converter class which includes:

▪ Private attribute for input of data type double ▪ Default constructor with no parameter which sets input to Double.NaN

▪ Overloaded constructor with input for parameter ▪ Get and set methods for input attribute ▪ Method convert() which returns input value

b. TemperatureConverter class which is a child of Converter and includes:

▪ Constructors which call parent constructors ▪ Overridden convert() method to convert input (Fahrenheit temperature) to

Celsius and returns the value. If the instance has no input value, it should return Double.NaN

▪ Use the following formula for conversion: C = ((F-32)*5)/9 c. DistanceConverter class which is a child of Converter and includes:

▪ Constructors which call parent constructors ▪ Overridden convert() method to convert input (distance in miles) to distance in

kilometers and returns the value. If the instance has no input value, it should return Double.NaN

d. Use the following formula for conversion: KM = M * 1.609 2) Implement GUIConverter class using JFrame and JPanel as follows:

a. GUI will have 3 buttons: “Distance Converter”, “Temperature Converter”, and “Exit”.

b. When user clicks Exit, the program will terminate

c. When user clicks Distance Converter, an input dialog will pop up where user can type

value and click OK:

d. Once user clicks OK, message dialog will pop up:

e. When user clicks on Temperature button, an input dialog will pop up to input value

and then when clicks OK, the message dialog with pop up with converted result:

f. SUGGESTIONS: ▪ For the input dialog you can use JOptionPane.showInputDialog ▪ The ActionListener for each Converter button should create the appropriate

Converter child instance, set the input, and call its convert() method ▪ For the pop up with converted value you can use

JOptionPane.showMessageDialog

Style and Documentation:

Make sure your Java program is using the recommended style such as: ▪ Javadoc comment up front with your name as author, date, and brief purpose of

the program

▪ Comments for variables and blocks of code to describe major functionality

▪ Meaningful variable names and prompts ▪ Class names are written in upper CamelCase

▪ Constants are written in All Capitals ▪ Use proper spacing and empty lines to make code human readable

Capture execution: You should capture and label screen captures associated with compiling your code, and running a passing and failing scenario for each functionality

Submission requirements

Deliverables include Java program (.java) and a single Word (or PDF) document. The Java files should be named appropriately, and the Word/PDF file should be named as Assignment3.

The word (or PDF) document should include screen captures showing the successful compiling and running of each of the test scenario. Test scenarios should include all required functionality

of the program. Each screen capture should be properly labeled clearly indicated what the

screen capture represents.

Submit your files to Assignment 3 submission area no later than the due date listed in your online classroom.

Grading Rubric:

The following grading rubric will be used to determine your grade:

Attribute Level Level Level 0

(15-20 points) (5-15 points) (0 – 5 points)

The Converter class Correct or Mistakes in Missing or significantly

hierarchy almost correct implementation incorrect implementation

attributes and

inheritance

structure and

polymorphism

(overloading and

overriding)

Welcome screen Correct or Mistakes in Missing or significantly

with buttons almost correct implementation incorrect implementation

code to display

three buttons

Distance Converter Correct or Mistakes in Missing or significantly

almost correct implementation incorrect implementation

code for distance

converter button

Temperature Correct or Mistakes in Missing or significantly

Converter almost correct implementation incorrect implementation

code for

temperature

converter button

Program Correct or Mistakes or Missing or significantly

documentation and almost correct incomplete menu, incorrect menu, documentation

style, screen menu, program documentation and/or style, or screen captures

captures comments, and/or style, and

identifiers, and screen captures

screen captures

Project

Media Rental System

Before attempting this project, be sure you have completed all of the reading assignments, non-

graded exercises, examples, discussions, and assignments to date.

Design and implement Java program as follows:

1) Media hierarchy:

 Create Media, EBook, MovieDVD, and MusicCD classes from Week 3 -> Practice Exercise – Inheritance solution.

 Add an attribute to Media class to store indication when media object is rented versus available. Add code to constructor and create get and set methods as appropriate.

 Add any additional constructors and methods needed to support the below functionality

2) Design and implement Manager class which (Hint: check out Week 8 Reading and Writing files example):

 stores a list of Media objects

 has functionality to load Media objects from files

 creates/updates Media files

 has functionality to add new Media object to its Media list

 has functionality to find all media objects for a specific title and returns that list

 has functionality to rent Media based on id (updates rental status on media, updates file, returns rental fee)

3) Design and implement MediaRentalSystem which has the following functionality:

 user interface which is either menu driven through console commands or GUI buttons or menus. Look at the bottom of this project file for sample look and feel. (Hint: for

command-driven menu check out Week 2: Practice Exercise – EncapsulationPlus and

for GUI check out Week 8: Files in GUI example)

 selection to load Media files from a given directory (user supplies directory)

 selection to find a media object for a specific title value (user supplies title and should display to user the media information once it finds it – should find all media with that

title)

 selection to rent a media object based on its id value (user supplies id and should display rental fee value to the user)

 selection to exit program 4) Program should throw and catch Java built-in and user-defined exceptions as appropriate 5) Your classes must be coded with correct encapsulation: private/protected attributes, get

methods, and set methods and value validation

6) There should be appropriate polymorphism: overloading, overriding methods, and dynamic binding

7) Program should take advantage of the inheritance properties as appropriate

Style and Documentation:

Make sure your Java program is using the recommended style such as:

 Javadoc comment up front with your name as author, date, and brief purpose of the program

 Comments for variables and blocks of code to describe major functionality

 Meaningful variable names and prompts

 Class names are written in upper CamelCase

 Constants are written in All Capitals

 Use proper spacing and empty lines to make code human readable

Capture execution:

You should capture and label screen captures associated with compiling your code, and running

the a passing and failing scenario for each functionality

Submission requirements

Deliverables include Java program (.java files) and a single Word (or PDF) document. The

Word/PDF files should be named appropriately for the assignment (as indicated in the

SubmissionRequirements document.

The word (or PDF) document should include screen captures showing the successful compiling

and running of each of the test scenario. Test scenarios should include all required functionality

of the program. Each screen capture should be properly labeled clearly indicated what the screen

capture represents.

Submit your files to project submission area no later than the due date listed in your online

classroom.

Grading Rubric: The following grading rubric will be used to determine your grade:

Attribute Level

(15-20 points)

Level

(5-15 points)

Level 0

(0 – 5 points)

Media hierarchy Correct or

almost correct

code to meet

project

requirements

Mistakes in

implementation

Missing or significantly

incorrect implementation

Manager Correct or

almost correct

code to meet

requirements

Mistakes in

implementation

Missing or significantly

incorrect implementation

MediaRentalSystem:

load data, find

media, rent media

Correct or

almost correct

code to meet

requirements

Mistakes in

implementation

Missing or significantly

incorrect implementation

Encapsulation,

polymorphism,

exception handling

Correct or

almost correct

code to meet

requirements

Mistakes in

implementation

Missing or significantly

incorrect implementation

Program

documentation and

style, screen

captures

Correct or

almost correct

menu/GUI,

program

comments,

identifiers, and

screen captures

Mistakes or

incomplete

menu/GUI,

documentation

and/or style, and

screen captures

Missing or significantly

incorrect menu/GUI,

documentation and/or style, or

screen captures

Sample User interface – command driven:

Welcome to Media Rental System 1: Load Media objects… 2: Find Media object… 3: Rent Media object… 9: Quit Enter your selection : 1 Enter path (directory) where to load from: blah File cannot be opened: Could not load, no such directory Welcome to Media Rental System 1: Load Media objects… 2: Find Media object… 3: Rent Media object… 9: Quit Enter your selection : 1 Enter path (directory) where to load from: C:/tmp-umuc Welcome to Media Rental System 1: Load Media objects… 2: Find Media object… 3: Rent Media object… 9: Quit Enter your selection : 2 Enter the title: blah There is no media with this title: blah Welcome to Media Rental System 1: Load Media objects… 2: Find Media object… 3: Rent Media object… 9: Quit

Enter your selection : 2 Enter the title: Forever Young EBook [ id=123, title=Forever Young, year=2018, chapters=20 available=true] MovieDVD [ id=126, title=Forever Young, year=2020, size=140.0MB available=false] Welcome to Media Rental System 1: Load Media objects… 2: Find Media object… 3: Rent Media object… 9: Quit Enter your selection : 3 Enter the id: 123 Media was successfully rented. Rental fee = $2.00 Welcome to Media Rental System 1: Load Media objects… 2: Find Media object… 3: Rent Media object… 9: Quit Enter your selection : 2 Enter the title: Forever Young EBook [ id=123, title=Forever Young, year=2018, chapters=20 available=false] MovieDVD [ id=126, title=Forever Young, year=2020, size=140.0MB available=false] Welcome to Media Rental System 1: Load Media objects… 2: Find Media object… 3: Rent Media object… 9: Quit Enter your selection : 3 Enter the id: 999 The media object id=999 is not found Welcome to Media Rental System 1: Load Media objects… 2: Find Media object… 3: Rent Media object… 9: Quit Enter your selection : 9 Thank you for using the program. Goodbye!

Sample User interface – GUI:

Above closed the window by pressing the X, results in below: