在kotlin中不能将observableArrayList用作哈希图的值

import javafx.collections.FXCollections
import javafx.collections.ObservableMap

fun main() {
    val map: ObservableMap<String, String> = FXCollections.observableMap(hashMapOf())
    map["key1"] = "value1"
    map["key2"] = "value2"

    map.addListener { change ->
        while (change.next()) {
            if (change.wasAdded()) {
                for (entry in change.addedSubList) {
                    println("Added: ${entry.key} -> ${entry.value}")
                }
            }
            if (change.wasRemoved()) {
                for (entry in change.removed) {
                    println("Removed: ${entry.key} -> ${entry.value}")
                }
            }
        }
    }

    map["key1"] = "updatedValue"
    map.remove("key2")
}