[Swift] 스위프트2(swift2) 기초 - 5

- 클래스 -

//class object 생성

class Vehicle{

    var currentSpeed = 0.0  //stored property - 값을 저장하기 위함

    var description : String {    // computed property - 값을 저장하지는 않음

        return "traveling at \(currentSpeed) miles per hour"

    }

    

    func makeNoise(){   // method

        

    }

}

let someVehicle = Vehicle()

someVehicle.currentSpeed = 50

print(someVehicle.description)

//상속받기

class Bicycle : Vehicle {

    var hasBasket = false

}

let bicycle = Bicycle()

bicycle.hasBasket = true

bicycle.currentSpeed = 15.0

print(bicycle.description)

class Tandem: Bicycle {

    var currentNumberOfPassengers = 0

}

let tandem = Tandem()

tandem.hasBasket = true

tandem.currentNumberOfPassengers = 2

tandem.currentSpeed = 22.0

print(tandem.description)

// 오버라이딩

class Train : Vehicle{

    override func makeNoise() {

        print("Choo Choo")

    }

}

let train = Train()

train.makeNoise()