Object Oriented Programming - Abstraction & Encapsulation
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This document discusses abstraction and encapsulation in object-oriented programming. It defines abstraction as extracting only relevant information and gives an example of displaying a car without needing to know if insert or delete functions are available. Encapsulation is defined as an object's ability to hide data and behavior not necessary to its user. It provides examples of public and private access specifiers to restrict access to properties and methods. Access specifiers like public, private, protected and internal are also explained with examples.
Object Oriented Programming - Abstraction & Encapsulation
- 1. 2SC2 – OOP C# Dudy Fathan Ali S.Kom Abstraction dan Encapsulation 2SC2 Dudy Fathan Ali, S.Kom (DFA) 2015 CEP - CCIT Fakultas Teknik Universitas Indonesia
- 2. Abstraction 2SC2 – OOP C# Dudy Fathan Ali S.Kom You are the salesman, please help the customer.. Hey, I need a Car.
- 3. Abstraction 2SC2 – OOP C# Dudy Fathan Ali S.Kom Hey, I need a Car. You are the salesman, please help the customer..
- 4. Abstraction 2SC2 – OOP C# Dudy Fathan Ali S.Kom Abstraction involves extracting only the relevant information. Courseware NIIT – Object Oriented Programming Using C# - 1
- 5. 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.
- 6. 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
- 7. 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
- 8. 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
- 9. 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 class Yes, same class! method method
- 10. 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
- 11. 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
- 12. 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(); Public Private Access Specifier
- 13. 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
- 14. 3SC4 PNJ – Q5 Dudy Fathan Ali S.Kom Terima Kasih Dudy Fathan Ali S.Kom [email protected]