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Task
Assessment 3 has 20 marks in total. Marks will be scaled according to the value of the assignment. Assessment 3 has two Tasks. Task 1 is to create subject class and test its properties, Task 2 is to create Octagon class from super classes and then test its properties.
Task 1

Value: 12 marks

For this task you will create a Subject class, whose instances will represent the subjects for study at a university. A subject will have a name, just a String, and a subject code, which is a six-character String. The first three characters of a subject code are alphabetic and the last three are numeric. The first three characters define the subject's discipline area. A subject code must be unique.

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Unit 6 Research project
You will also write a TestSubject class to test the use of your Subject class. In particular this will maintain an array of subjects. In order to manage the uniqueness of the subject codes, your program will need to display information about existing subject codes as well as checking that any new subject code supplied by the user is not the same as any existing subject code.

The following state and functionality should be provided for the Subject class:
• Two fields will hold the subject’s name and the six-character subject code.
• A constructor will allow a name and a new, validated subject code to be provided when a new subject is created.
• Getters will provide access to the attributes.

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• An accessor method called getDiscipline will return a string containing the first three characters of the subject code.
• Another accessor method called codeMatches will return a boolean value indicating if the subject's code matches the string argument provided. -Matches- is used here in the same sense as for the matches method of the String class.
• A toString method will return a string containing the subject code and subject name.
To assist with managing subject codes and their uniqueness you will provide the Subject class with some class methods as follows:
• An allDisciplines method will accept an array of Subject objects. It will return an array containing the different 3-character discipline codes represented in the array of subjects in alphabetically order.
• A codesPerDiscipline method will accept an array of Subject objects and a 3-character discipline code. It will return an array containing the different subject codes represented in the array of subjects for the particular discipline.
• An isValidCode method will accept a string that is a possible new subject code, and return a boolean indicating whether it satisfies the structural requirements for a subject code.
• A codeExists method will accept an array of Subject objects and a possible new subject code. It will return a boolean indicating whether that code has already been allocated to one of the subjects in the array.
• A sortDisciplines method will accept an array of Subjects objects. It will return the sorted array of subjects in alphabetically order.
Your TestSubject program will perform the following sequence of actions, using good design techniques such as in the appropriate use of methods:
• An initial array of Subject objects will be created from any data in a file that was previously saved by the program.
• The user interaction will then proceed to allow the user to add one or more new subjects to the array. If the user wishes to add new subjects, the discipline areas of existing subjects should be displayed in alphabetically order. The user will then enter a discipline code to which the program will respond by displaying any existing subject codes in that discipline. This procedure simplifies the user’s task of choosing subject codes that do not already exist, but does not prevent user mistake. Each subject code entered by the user should be checked. The user can enter any new subjects in that discipline (or indeed in other disciplines). The user should be given the choice of repeating the processing for other discipline areas.
• When the user has finished adding subjects, and only if subjects have indeed been added, the program will overwrite the data file with the updated data.
Note:

Understanding specific need in health and social care

Unit 6 Research project
• You may use an ArrayList to implement an array if you prefer and it is appropriate.

Task 2

Value: 8 marks

Design a class named Octagon that extends GeometricObject class and implements the Comparable and Cloneable interface. Assume that all eight sides of the octagon are of equal size. The area can be computed using following formula:

Draw the UML diagram that involves Octagon, GeometricObjects, Comparable, and Cloneable. Write a test program that creates an Octagon object with side values 5 and display its area and perimeter. Create a new object using clone method and compare the two objects using compareTo method.

GeometricObject class can be found in textbook. It is also given below.

Online submission via Turnitin is required for this assignment. Details will be provided by your subject lecturer.

Rationale
This assignment has been designed to allow students to test and demonstrate their ability to:
• to interpret and evaluate design requirements expressed in Unified Modelling Language (UML) (objective 2);
• to apply inheritance and aggregation patterns in the design and implementation of programs (Objective 3);
• be able to compare and critically evaluate different programming paradigms (Objective 6);
• to manipulate file operations through Java programming; (objective 7);
• to use object-oriented techniques and Java resources to develop small applications consisting of a number of classes (objective 4)
Marking criteria

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These criteria will be used to evaluate Assignment 3:
• The tasks are performed as specified and the assignment is submitted as required
• Appropriate understanding of the subject area is demonstrated, including correct use of appropriate techniques
• Explanations and discussions are cogent and use clear and correct English expression
• Referencing is used where appropriate
Marking guide of the specific tasks:
Assessment 3 (Total marks 20)
Task 1 (total marks 12)
Criteria Marks Pass CR DI HD
a. Execution: Program launches, executes and terminates without crashing; program executes as specified. 1.0 Provide java files. They execute without crashing towards intended output (1.0)
b. Program design & implementation: Subject (3), TestSubject (3), and file read/write (3) classes are implemented as specified, showing good logic. 9.0 Implement and integrate Subject and TestSubject classes with some functions using file read & write (4.5) Implement and integrate Subject and TestSubject classes with majority of the functions using file read & write (6) Implement and integrate Subject and TestSubject classes with majority of the functions using file read & write (7) Implement and integrate Subject and TestSubject classes with all functions using file read & write maintaining logical flow (9)
c. Presentation: Code uses good style (indentation, comments) 0.5 Few comments and minor indentation errors (0.25) Proper indentation &comments in each block and major lines (0.5)
d. Submission: the documents with all components (analysis, testing, and output) 1.5 Provide sample output (0.75) Provide all components within the specified word length(1.5)
Task 2 (total marks 8)
Criteria Marks Pass CR DI HD
a. Execution: Program launches, executes and terminates without crashing; program executes as specified. 0.5 Provide java files. They execute without crashing towards intended output (0.5)
b. Program design & implementation: Octagon (1.5) and TestOctagon(1) classes are implemented as specified, showing good logic. 4.5 Implement and integrate Octagon and TestOctagon classes with some functions using super/sub class relationship (1.25) Implement and integrate Octagon and TestOctagon classes with majority functions using super/sub class relationship (3.0) Implement and integrate Octagon and TestOctagon classes with all functions using super/sub class relationship maintaining logical flow (4.5)

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c. UML design: For classOctagon. 1.5 UML with all components (0.5) UML with all components and their modifier, argument, and return type with minor error (0.75) UML with all components and their modifier, argument, and return type (1.5)
d. Presentation: Code uses good style (indentation, comments) 0.5 few comments and minor indentation errors (0.25) Proper indentation &comments in each block and major lines (0.5)
e. Submission: The document with all components (analysis, testing, and output) 1.0 Provide sample output (0.25) Provide all components within the specified word length with good explanation (1.0)

Presentation
Material to submit for Task 1

1. You need to submit the java and class files
2. You also need to submit a doc/pdf file with following information:

a. Analysis: Describe the problem including input and output in your own words (not more than 400 words)
b. Testing: Describe how you test this program (not more than 400 words)
c. Output: Copy and paste a snapshot of the program output

Material to submit for Task 2

1. You need to submit the java and class files
2. You also need to submit a doc/pdf file with following information:

a. Analysis: Describe the problem including input and output in your own words (not more than 400 words)
b. Testing: Describe how you test this program (not more than 400 words)
c. Output: Copy and paste a snapshot of the program output

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