kotlin之open class继承

7 kotlin之class继承open

open表示可继承,extends也被改为:

open class Car(brand: String) {
    var brand: String = brand
    fun showBrand() {
        println("This brand is $brand ")
    }
}

class Lexus : Car("Lexus") {}
class Honda : Car("Honda") {}

fun main() {
    var car = Car("Toyota")
    var lexus = Lexus()
    var honda = Honda()

    car.showBrand()
    lexus.showBrand()
    honda.showBrand()
}
 

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