Kotlin 基本语法5 继承，接口，枚举，密封

最新推荐文章于 2025-03-22 08:00:00 发布

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最新推荐文章于 2025-03-22 08:00:00 发布 · 873 阅读

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#kotlin #javascript #服务器

1.继承与重写的Open关键字

open class Product(
    val name:String
) {

    fun description() = "Product: $name"

   open fun load() = "Nothing .."


}


class LuxuryProduct:Product("Luxury"){//继承需要调用 父类的主构造函数

    override fun load(): String {
        return "LuxuryProduct loading ..."
    }

}

fun main() {
    val p:Product = LuxuryProduct()
    println(p.load())
}

2.类型检测

3.智能类型转化

import java.io.File

open class Product(
    val name:String
) {

    fun description() = "Product: $name"

   open fun load() = "Nothing .."


}


class LuxuryProduct:Product("Luxury"){//继承需要调用 父类的主构造函数

    override fun load(): String {
        return "LuxuryProduct loading ..."
    }
    fun  special():String = "Speical LuxuryProduct Function"

}

fun main() {
    val p:Product = LuxuryProduct()
    println(p.load())

    println(p is Product)
    println(p is LuxuryProduct)
    println(p is File)


    if (p is LuxuryProduct){
        p.special()
    }
}