介面之間可以互有繼承關係，亦即使用承接自父介面(super interface)的子介面(sub interface)來創建物件。

interface Named {
    val name: String
}

interface Person : Named {
    val firstName: String
    val lastName: String

    override val name: String get() = "$firstName $lastName"
}

data class Employee(
    // implementing 'name' is not required
    override val firstName: String,
    override val lastName: String,
    val position: Position
) : Person

Reference

• Interfaces | Kotlin
• Kotlin使用心得（八）：無形勝有形 — 抽象類別、方法與介面c