Python Tutorial - Encapsulation - 016

 Encapsulation adalah konsep dasar dalam Object Oriented Programming (OOP).  Encapsulation menyebabkan kita bisa melakuan restriksi. 

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Restriksi itu dilakukan terhadap metode dan variabel tertentu dalam class.

Apa itu "Object-Oriented Programming?":

- OOP tergantung pada konsep classes dan objects

- Classes mendifinisikan attributes dan metode

- objects dikreasi dari classes

- Untuk contoh, ada class yang disebut car. Attributesnya color, brand dan mode. Kemudian myCar adalah nilai unik dari class.

Memahami Private Method

Kita punya car sebagai class, dimana ada main method, yaitu main method: drive() dan private method: _udateSoftware().

class Car:

    def __init__(self):

        self.__updateSoftware()

    def drive(self):

        print('driving')

    def __updateSoftware(self):

        print('updating software')

redcar = Car()

redcar.drive()

Output:

updating software

driving

Memanfaatkan Private Variabel.

class Car:

    __maxspeed = 0

    __name = ""

    def __init__(self):

        self.__maxspeed = 200

        self.__name = "Supercar"

    def drive(self):

        print('driving. maxspeed ' + str(self.__maxspeed))

redcar = Car()

redcar.drive()

redcar.__maxspeed = 10  # This won't alter the variable as it's private.

redcar.drive()

Output:

driving. maxspeed 200

driving. maxspeed 200

Sekarang kita ingin mengubah private variabel:

class Car:

    __maxspeed = 0

    __name = ""

    def __init__(self):

        self.__maxspeed = 200

        self.__name = "Supercar"

    def drive(self):

        print('driving. maxspeed ' + str(self.__maxspeed))

    def setMaxSpeed(self, speed):

        self.__maxspeed = speed

redcar = Car()

redcar.drive()

redcar.setMaxSpeed(320)

redcar.drive()

Output:

driving. maxspeed 200

driving. maxspeed 320

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