Presentasi saya tentang Object Oriented Programming, Encapsulation, dan Access Modifier

1. Object Oriented Programming
Irfan Wahyudin, S.Si, M.Kom

2. Pertemuan Sebelumnya...
● Top down/bottom up Programming
● Structured Programming
● Procedural Programming

3. Mengapa Perlu OOP?
● Top-Down/Bottom-Up Programming→
Spaghetti Code
● Structured Programming → Tidak reusable
● Procedural Programming → Sudah reusable,
tetapi belum merepresentasikan object, belum
modular, dan hard-to-manage

4. Object Oriented Programming
● Untuk itu dikembangkan OOP
● Konsep dasar OOP:
– Objek
– Abstraksi
– Enkapsulasi
– Polimorfisme
– Inheritance

5. Enkapsulasi
● Ilustrasi...

6. Kenapa Butuh Enkapsulasi?

7. Representasi dalam Program
Class Animal{
string color;
bool canWrite;
Animal(bool _canWrite){
canRun = _canWrite;
}
void setColor(string _color){
color = _color;
}
void write(){
if (canWrite){
System.out.println(“Wow...it can write”);
}
}
}
Class AnimalTest{
public static void main(string [] Args){
Animal dog = new Animal(true);
Animal sheep = new Animal(false);
dog.write();
dog.color = “red”;
dog.setColor(“red”);
}
}

8. Contoh lain...
class Saving {
public class Account {
private decimal accountBalance = 5000;
private decimal registrationFee = 200;
public void deposit(decimal amount) {
amount = amount - registrationFee;
accountBalance += amount;
}
}
static void Main() {
Account myAccount = new Account();
MyAccount.accountBalance += 2000;
decimal myBalance = myAccount.deposit(2000);
}
}

9. Access Modifiers
● Private
● Protected
● Public

10. Private
●
Definition: “The type or member can be accessed only by code in
the same class or struct.”
●
Contoh:
Class Mahasiswa(){
private string nik;
private string nama;
private string getNama(){
return nama;
}
}
Class Universitas(){
public static void main(String [] args){
Mahasiswa mhs = new Mahasiswa();
System.out.print(mhs.nama);
}
}

11. Public
● Definition: “The type or member can be
accessed by any other code in the same
assembly or another assembly that references
it.”

12. Protected
● Definition: “The type or member can be
accessed only by code in the same class or
struct, or in a class that is derived from that
class.”
● Penggunaan: Lebih banyak pada kasus
turunan class (Inheritance)