2SC2 – OOP C# Dudy Fathan Ali S.Kom

Abstraction dan Encapsulation2SC2

Dudy Fathan Ali, S.Kom (DFA)2015

CEP - CCITFakultas Teknik Universitas Indonesia

Abstraction

2SC2 – OOP C# Dudy Fathan Ali S.Kom

You are the salesman, please help the customer..

Hey, I need a Car.

Abstraction

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Hey, I need a Car.

You are the salesman, please help the customer..

Abstraction

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Abstraction involves extracting only the relevant information.

Courseware NIIT – Object Oriented Programming Using C# - 1

Abstraction

2SC2 – OOP C# Dudy Fathan Ali S.Kom

In a programmer’s perspective..

Display Car

Insert Car

Class Car

I want to Display the Car

Delete Car

Just because the user want to display it, doesn’t mean insert and delete function is unavailable.

Encapsulation

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Encapsulation, in the context of C#, refers to an object's ability to hide data and behavior that are not necessary to its user.

www.techopedia.com

Private - Employee’s

Salary

I want to access ID Employee

Yes, because it’s Public

Public – Name, ID of Employee

Cashier

Human Resources Database

Human Resources Database

Encapsulation

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Encapsulation, in the context of C#, refers to an object's ability to hide data and behavior that are not necessary to its user.

www.techopedia.com

Private - Employee’s

Salary

Public – Name, ID of Employee

I want to access my

friend’s salary

No, because it’s private!! It

doesn’t belongs to

cashier.

Cashier

Human Resources Database

Encapsulation

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Encapsulation, in the context of C#, refers to an object's ability to hide data and behavior that are not necessary to its user.

www.techopedia.com

Private - Employee’s

Salary

Public – Name, ID of EmployeeHRD Manager

I want to access my

friend’s salary

Yes, because this data is belongs to

him

Yes, because this data is belongs to him and also it’s

public

Encapsulation

2SC2 – OOP C# Dudy Fathan Ali S.Kom

In a programmer’s perspective..

Private – Employee’s

Salary

Public – Name, ID of Employee

Access to all code in the program

Class HR_Data

Access to only members of the

same classYes, same

class!

method

method

Private

Encapsulation – Access Specifier

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Encapsulation, in the context of C#, refers to an object's ability to hide data and behavior that are not necessary to its user.

www.techopedia.com

Public Protected

Internal

Protected Internal

Access Specifier

Encapsulation – Access Specifier

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Encapsulation, in the context of C#, refers to an object's ability to hide data and behavior that are not necessary to its user.

www.techopedia.com

Encapsulation – Access Specifier

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Encapsulation, in the context of C#, refers to an object's ability to hide data and behavior that are not necessary to its user.

www.techopedia.com

Class DisplayData{ public void Method1() { Console.WriteLine(“Public”); Method2(); }

private void Method2() { Console.WriteLine(“Private”); }}

Output :

Class Program :DisplayData dd = new DisplayData();

dd.Method1();

PublicPrivate

Access Specifier

Encapsulation – Access Specifier

2SC2 – OOP C# Dudy Fathan Ali S.Kom

Encapsulation, in the context of C#, refers to an object's ability to hide data and behavior that are not necessary to its user.

www.techopedia.com

Class DisplayData{ public void Method1() { Console.WriteLine(“Public”); Method2(); }

private void Method2() { Console.WriteLine(“Private”); }}

Output :

Error!! Because method2()

has a private access.

Class Program :DisplayData dd = new DisplayData();

dd.Method2();

Access Specifier

3SC4 PNJ – Q5 Dudy Fathan Ali S.Kom

Terima KasihDudy Fathan Ali S.Kom

dudy.fathan@eng.ui.ac.id