hello

lesson1/src/main/kotlin/Main.kt

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+/*
+ * Lesson: Basic Structure of JavaFX Applications
+ *
+ * Application
+ *   Stage: aka. the window
+ *     Scene: A Stage can contain multiple Scenes, but only one can be displayed at a time
+ *       Parent (e.g., Group, Pane)
+ *         Node (e.g., Button, Label)
+ *       Parent (e.g., VBox, HBox)
+ *         Node (e.g., TextField)
+ *         Node (e.g., CheckBox)
+ *         ...
+ *       ...
+ */
+
+import javafx.application.Application
+import javafx.stage.Stage
+
+// 1. create a class that extends javafx.application.application
+class MainApplication : Application() {
+    // 2. override Application.start
+    override fun start(stage: Stage) {
+        stage.title = "i am Stage"
+        stage.show()
+    }
+}
+
+fun main(args: Array<String>) {
+    Application.launch(MainApplication::class.java, *args)
+}