我想知道是否有辦法檢查lateinit變量是否已初始化。

import javafx.application.Application

import javafx.event.EventHandler

import javafx.geometry.Insets

import javafx.geometry.Pos

import javafx.scene.Scene

import javafx.scene.control.Button

import javafx.scene.control.ComboBox

import javafx.scene.layout.VBox

import javafx.stage.DirectoryChooser

import javafx.stage.Stage

import java.io.File

class SeriesManager() {

lateinit var seriesDir: File

val allSeries by lazy {

seriesDir.listFiles().map { it.name }.toTypedArray()

}

}

class SeriesManagerUI : Application() {

override fun start(primaryStage: Stage) {

val sm = SeriesManager()

val setSeriesDirBtn = Button("Change all series location").apply {

onAction = EventHandler {

sm.seriesDir = DirectoryChooser().apply {

title = "Choose all series location"

}.showDialog(primaryStage)

}

}

val allSeriesList = ComboBox().apply {

promptText = "Select a series from here"

isDisable = // I want this to be always true, unless the SeriesManager.seriesDir has been initialized

}

val setCurrentEpisodeBtn = Button("Change the current episode")

val openNextEpisode = Button("Watch the next episode")

val layout = VBox(

setSeriesDirBtn,

allSeriesList,

setCurrentEpisodeBtn,

openNextEpisode

).apply {

padding = Insets(15.0)

spacing = 10.0

alignment = Pos.CENTER

}

primaryStage.apply {

scene = Scene(layout).apply {

minWidth = 300.0

isResizable = false

}

title = "Series Manager"

}.show()

}

}

fun main(args: Array) {

Application.launch(SeriesManagerUI::class.java, *args)

}

總結

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