継承

open class Car(engine: String, body: String){
	fun drive(){
    
    	}
        fun stop(){
        
        }
}

class SuperCar(engine: String, body: String): Car(engine, body){
	
}

📌 に火をつける

open class Car(engine: String, body: String){
	open fun drive(): String{
    		return "달린다."
    	}
        fun stop(){
        
        }
}

class SuperCar(engine: String, body: String): Car(){
	override fun drive(): String{
    		val run = super.drive()
            	return "빨리 $run"
    	}
}

練習問題を引き継ぐ

Charactorクラス:親->攻撃と防御 SuperNight類：Charactorの子類を引き継ぐ SuperMonsterクラス：Charactorのサブクラス+ビットを継承

// 부모 클래스이므로 open 키워드 사용
open class Charactor(var hp: Int, val power: Int){
    fun attack(charactor: Charactor, power: Int = this.power){
        charactor.defense(power)
    }

    // SuperNight클래스에서 오버라이딩 하기 때문에 open 키워드 사용
    open fun defense(damage: Int){
        hp -= damage
        if(hp > 0) println("${javaClass.simpleName}의 남은 체력 : $hp")
        else println("사망했습니다.")
    }
}

class SuperNight(hp: Int, power: Int): Charactor(hp, power){
    val defensePower = 2
    
    // 부모 클래스의 defense 오버라이딩
    override fun defense(damage: Int) {
        super.defense(damage - defensePower)
    }
}

class SuperMonster(hp: Int, power: Int): Charactor(hp, power){
    // SuperMonster의 추가 기능 bite
    fun bite(charactor: Charactor){
        super.attack(charactor, power + 2)
    }
}

fun main(args: Array<String>){
    val monster = SuperMonster(100, 10)
    val night = SuperNight(200, 8)

    monster.attack(night)
    monster.bite(night)
}

クラス名の読み込み方法

if(hp > 0) println("${javaClass.simpleName}의 남은 체력 : $hp")