Delegate

class Delegate {
    val name: String = "default"

    operator fun getValue(thisRef: Any?, property: KProperty<*>): String {
        return "getValue"
    }

    operator fun setValue(thisRef: Any?, property: KProperty<*>, value: String) {
        println("$value 已被赋值给 ${property.name} 于 $thisRef")
    }
}

class Example() {
    var name: String by Delegate()
}

fun main() {
    val e = Example()
    println(e.name) // getValue
    e.name = "hello" // hello 已被赋值给 name 于 org.example.Example@27973e9b
}