lsp_good_example.kt

interface Toy {
    var color: String?
}

open class FlyingToy : Toy {
    override var color: String? = "Red"
    open fun fly() {
        println("The toy is flying...")
    }
}

open class LandToy : Toy {
    override var color: String? = "Black"
    open fun move() {
        println("The toy is moving...")
    }
}

class Plane : FlyingToy() {
    override fun fly() {
        super.fly()
        println("The toy is flying...")
    }
}

class Car : LandToy() {
    override fun move() {
        super.move()
        println("The toy is moving...")
    }
}