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Language	Kotlin
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import kotlin.properties.Delegates
 
class User {
    var name: String by Delegates.observable("初始值") {
        prop, old, new ->
        println("旧值：$old -> 新值：$new")
    }
}
 
fun main(args: Array<String>) {
    val user = User()
 
 
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Snippet Metadata
Owner	w3xue
Created	2 years ago
Modified	2 years ago
Visibility	Public