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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