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R.M. Sandali Geethma Rathnayake Page no 1
Object Oriented Programming
Executive summary
This is an assignment comes under Object Oriented Programming module at HND in IT
program. For the completion of this assignment, I have to produce an Inventory System for
Zeus Pvt Limited assuming that I work as a C# programmer.
Zeus Pvt Limited is a Small Medium Enterprise, which renounce for importing a very rare
“Power™” branded nutrition supplements for patients who are suffering from Diabetes in Sri
Lanka. Therefore, I had to create a transaction processing system for Zeus Pvt Ltd.
To complete the Task 1 in this assignment, I have described the characteristics and principles
of Object Oriented Programming and provided a comprehensive report on how these
characteristics could apply in the required system.
For the Task 2 , I have been identified the objects (Classes) from the scenario and list all the
attributes and methods of each object.
Within Task 3 , I have drawn use case diagram, class diagram and sequence diagram for
Inventory System of Zeus Pvt Limited to create better and effective system solution.
To complete Task 4, I have designed and proposed an effective Inventory system solution for
Zeus Pvt Limited considering all functions should perform through the system by aid of the
Object Oriented solution using C#.Net.
In Task 5, I have provided the evidences of use of association, aggregation, composition and
generalization relationships from Inventory System of Zeus Pvt Limited.
There are two subtasks inside the Task 6 and within first subtask I have explain how the
concept of polymorphism used in Inventory System of Zeus Pvt Limited. In second subtask,
briefly explained about control structures and how those effectively have used in Inventory
System.
In Task 7, I have discussed the advantages of using Integrated Development Environment
when developing the system.
To complete Task 8, I had to prepare a test plan for Inventory System of Zeus Pvt Limited,
and then, I have critically reviewed and tested Inventory System according to the plan.
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Object Oriented Programming
Within Task 9, I have to analyze the actual test results against the expected results and have
to identify whether there are any inconsistencies in Inventory System.
To complete the Task 10, I have to gather the independent feedbacks from different users on
Inventory System, which I have implemented. In order to gather feedbacks from users I used
interviews as a feedback collecting method. Using feedbacks, I was able to get more
recommendations and improvements about Inventory System.
To complete Task 11, I have to explain and prove the user friendliness of Inventory System
for Zeus Pvt Limited.
In final Task, I prepared technical documentation for the supporting and maintenance of the
Inventory System including an installation and maintenance guide.
Object Oriented Programming
Discuss the characteristics and principles of Object Oriented Programming and provide
a comprehensive report on how these characteristics could be apply in the required system.
- R.M. Sandali Geethma Rathnayake Page no
- Executive summary.................................................................................................................... Table of Contents
- Acknowledgement
- TASK
- TASK
- Identifying the objects (Classes) from the scenario and list all the data and methods.
- TASK
- Use Case Diagram................................................................................................................
- Class Diagram
- Sequence diagram
- TASK
- Implement the Object Oriented solution using C#.Net for the proposed Design
- TASK
- relationships from your system. Provide evidences of use of association, aggregation, composition and generalization
- TASK
- a) Demonstrate how concept of polymorphism used in your system.
- b) Explain briefly how effectively control structures have used in your system.
- TASK
- development. Discuss the advantages of using Integrated Development Environment in the system
- TASK
- Prepare a test plan, then critically review and test your solution according to the plan.
- TASK
- Analyze actual test results against expected results and identify inconsistencies.
- R.M. Sandali Geethma Rathnayake Page no
- TASK Object Oriented Programming
- other feedback collecting method) and suggest recommendations and improvements. Get independent feedback on your solution (use surveys, questioners, interviews or any
- TASK
- Explain and prove user friendliness of your solution.
- TASK
- Prepare the technical documentation for the support and maintenance of the software
- Zeus Inventory Control System Support Guide
- Zeus Inventory Control System Maintenance Guide
- Conclusion
- Self-Evaluation
- Gantt chart
- References
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Object Oriented Programming
2) Polymorphism
The word Polymorphism means having many forms. In OOP the polymorphisms is achieved
by using many different techniques named method overloading, operator overloading, and
method overriding, The following example shows using function print () to print different
data types:
Table1. 2 : Coding example for Polymorphism
Code classPrintData{ void print(int i){ Console.WriteLine("Printing int: {0}", i);} void print(string s){ Console.WriteLine("Printing string: {0}", s);} static void Main(string[] args){ PrintData p=newPrintData(); p.print(5); p.print("Hello C++"); Console.ReadKey();}}
3) Inheritance
Inheritance allows us to define a class in terms of another class, which makes it easier to
create and maintain an application. This also provides an opportunity to reuse the code
functionality and speeds up implementation time.
Table1. 3 : Coding example for Inheritance
Code class Shape{ public void setWidth(int w){ width=w;} public void setHeight(int w){ height=h;} protect dint width; protect dint height;} class Rectangle: Shape{ public int getArea(){ return(width * height);}} classRectangleTester{ static void Main(string[] args){ Rectangle rect=new Rectangle(); rect.setHeight(5); rect.setWidth(7); Console.WriteLine("Total area: {0}", rect.getArea()); Console.ReadKey();}}
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Object Oriented Programming
4) Abstract Class
The abstract modifier can use with classes, methods, properties, indexers, and events.
Members marked as abstract or included in an abstract class, must implement by classes that
derive from the abstract class.
Table1. 4 : Coding example for Abstract Class
Code class Square : ShapeClass{ int side = 0; public Square(int n){ side = n; } Public override int Area(){ return side * side; } static void Main(){ Square sq = new Square(12); Console.WriteLine("Area of Square = {0}", sq.Area()); } Interface Intl{ void M(); } Abstract class C : I { Public abstract void M(); }
5) Interface
Interfaces define properties, methods, and events, which are the members of the interface. It
is the responsibility of the deriving class to define the members.
Table1. 5 : Coding example for Interface
Code Public class ITransactions{ void showTransaction(); double getAmount(); } Public class Transaction: ITransactions{ Private string tCode,date; Private double amount; public Transaction(){ tCode = ""; date = ""; amount = 00; } public Transaction(string c, string d, double a){
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Object Oriented Programming
7) Constructor
Constructors have the same name as the class or struct, and they usually initialize the data
members of the new object.
Table1. 7 : Coding example for Constructor
Code Public class Taxi{ Public bool isInitialized; public Taxi();{ isInitialized = true; }} class TestTaxi{ static void Main(){ Taxi t = new Taxi(); Console.WriteLine(t.isInitialized);}}
8) Destructor
As we all know, ‘Destructors’ are used to destruct instances of classes. When using
destructors in C#, keep in mind the following things:
1. A class can only have one destructor.
2. Destructors cannot inherit or overload.
3. A destructor does not take modifiers or have parameters.
The following is a declaration of a destructor for the class MyClass:
Table1. 8 : Coding example for Destructor
Code ~MyClass() { //Cleaning up code goes here }
9) Instant Variable
Instance variables declare in a class, but outside a method, constructor or any block. Instance
variables create when an object is created with the use of the keyword 'new' and destroyed
when the object destroys. Access modifiers can give for instance variables.
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Object Oriented Programming
Table1. 9 : Coding example for Instant Variable
Code Public class Employee { Public String name; Private double salary; public Employee(String empName) { name = empName; } public voi setSalary(double empSal) { salary = empSal; }
10) Instant Method
Instance methods in a class can make use of any of the public or private static data that
belongs to that class.
Table1. 10 : Coding example for Instant Method
Code Public string Name{get; set} Public int Age{get; set} Public static Dog LastGuyThatBarked{get; protected set} Public readonly static string TheDogMotto = "Man's Best Friend"; Public static int TotalNumDogs = 0; public Dog(string name, int age) { Name =name; Age = age; TotalNumDogs++; } Public void Bark() { Console.WriteLine("{0} says Woof", Name); Dog.LastGuyThatBarked{get = this; Console.WriteLine("There are {0} total dogs", Dog.TotalNumDogs); Console.WriteLine("Remember our motto: {0}", Dog.TheDogMotto);}}
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Object Oriented Programming
TASK 02
Identifying the objects (Classes) from the scenario and list all the data and
methods.
Table2. 12 : Attributes and Method of Classes
Zeus Pvt Limited Hospital Company Name : varchar Address : varchar Name : varchar Address : varchar Import(numberOfItems ) : int Deliver() : int Make_Order() : int Send_Order() : int Inventory Registry Zeus Office Product_ID : int Product_Name : varchar Name : varchar Location : varchar Balance_Invenory() : int Update_Inventory() : int Collect_purchasedOrder() : varchar Send_purchasedOrder() : varchar Zeus Warehouse Issue Officer Name : varchar Location : varchar Emp_ID : int Name : varchar Collect_Invoice() : varchar Issue_Product() : varchar Update_Inventory() : varchar Issue_Products() : varchar Sales Officer Emp_ID : int Name : varchar Send_Order() : varchar Make_Order(): varchar
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Object Oriented Programming
TASK 03
Use Case Diagram
Figure3. 1 : Use Case Diagram for Zeus Inventory System
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Object Oriented Programming
Sequence diagram
Figure3. 3 : Sequence Diagram for Zeus Inventory System
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Object Oriented Programming
TASK 04
Implement the Object Oriented solution using C#.Net for the proposed
Design
Table4. 13 : Login Form Interface and coding
Login Form Interface
Figure4. 4 : Login Form
Code
namespace ZeusInventoryControlSystem{ public partial class frmLogin : Form { public frmLogin(){ InitializeComponent(); } Private void btnLogIn_Click(object sender, EventArgs e){ if (txtUserName.Text == "Zeuspvt"&& txtPassword.Text == "inventory@zeus"){ this.Hide(); frmMain objMain = new frmMain(); objMain.Show();} else{ Message box Show ("Sorry! You have entered wrong username or password. Try it again!", "Zeus Pvt Limited", MessageBoxButtons.OK, MessageBoxIcon.Error); txtUserName.Clear(); txtPassword.Clear(); } }
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Object Oriented Programming
frmOrderingProducts objOder = new frmOrderingProducts(); objOder.MdiParent = this; objOder.Show(); } Private void toolStripMenuItem3_Click(object sender, EventArgs e) { frmDeleteEntry objOder = new frmDeleteEntry(); objOder.MdiParent = this; objOder.Show(); } Private void toolStripMenuItem4_Click(object sender, EventArgs e) { frmHelp objHelp = new frmHelp(); objHelp.MdiParent = this; objHelp.Show(); } Private void toolStripMenuItem5_Click(object sender, EventArgs e) { Application.Exit(); }
Table4. 15 : Purchase Product Interface and coding
Purchase Product Interface
Figure4. 6 : Purchase Product Form
Code Private void btnPAdd_Click_2(object sender, EventArgs e){ if (txtPName.Text == "" || txtPPrice.Text == "" || txtPQuantity.Text == "") { MessageBox.Show("Please fill the value", "Product Inventory Control System, Zeus PVT Limited", MessageBoxButtons.OK, MessageBoxIcon.Error); }
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Object Oriented Programming
else { ClassConnection objConnection = new ClassConnection(); string getString = objConnection.conMethod(); SqlConnection con = new SqlConnection(getString); try { string productName = txtPName.Text; float productPrice = float.Parse(txtPPrice.Text); int productQuantity = int.Parse(txtPQuantity.Text); con.Open(); SqlCommand command = new SqlCommand("INSERT INTO [Product] (ProductName,Price,Quantity) VALUES('" + productName + "'," + productPrice + "," + productQuantity + ")", con); command.ExecuteNonQuery(); MessageBox.Show("Data Inserted successfully", "Product Inventory Control System, Zeus PVT Limited", MessageBoxButtons.OK, MessageBoxIcon.Information); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } finally { con.Close;}}}
Table4. 16 : Update Product Interface and coding
Update Product Interface
Figure4. 7 : Update Product Form
Code Private void btnUpdate_Click(object sender, EventArgs e) { if (txtUPName.Text == "" || txtUPPrice.Text == "" || txtUPQuantity.Text == "") { MessageBox.Show("Please Fill the value", "Product Inventory Control System, Zeus PVT Limited", MessageBoxButtons.OK, MessageBoxIcon.Error); } else
