【25】kotlin 密封类

• 子类可数（枚举是实例可数）

• <v1.1子类必须定义为密封类得内部类

• v1.1子类只需要与密封类在同一个文件夹中

code

package com.yzdzy.kotlin.SealedClass

sealed class PlayerCmd {
    class Play(val url: String, val position: Long = 0) : PlayerCmd()
    class Seek(val position: Long = 0) : PlayerCmd()
    object Pause : PlayerCmd()
    object Resume : PlayerCmd()
    object Stop : PlayerCmd()
}

enum class PlayerStae {
    IDLE, PAUSE, PLAYING
}

 

来源：oschina

链接：https://my.oschina.net/u/4321566/blog/4316306