JavaFX で KeyEvent を使用する

scene.setOnKeyPressed(
    (KeyEvent event)
        -> {
            // Create a key event that execute when any key pressed from your keyboard
            //  Add the actions that we are going to take when a key pressed.
        });

import javafx.application.Application; // Package to create application
import javafx.scene.Scene; // Package to create a scene
import javafx.scene.control.Label; // Package to create a label
import javafx.scene.input.KeyEvent; // Package to create a key event
import javafx.scene.layout.HBox; // Package for the Hbox
import javafx.stage.Stage; // Package to create a stage

public class FxKeyListen extends Application {
  Label lbl; // Declares a label
  HBox _hbox; // Declares a HBox.

  public void start(Stage SimpleStage) throws Exception {
    SimpleStage.setTitle(
        "Detect key event"); // Set the application title which is "Detect key event"
    lbl =
        new Label("No key is pressed !!!"); // Create a label with default text "No key pressed !!!"
    _hbox = new HBox(lbl); // Create a HBox  with a label
    Scene scene = new Scene(_hbox, 400, 400); // Create a scene with HBox and necessary dimentions.

    scene.setOnKeyPressed(
        (KeyEvent event)
            -> { // Create a key event that execute when any key pressed from your keyboard
          lbl.setText("Key press detected !!!"); // The actions that we are going to take when a key
                                                 // pressed. In our case we are changing the label
                                                 // text to "Key press detected !!!"
        });
    SimpleStage.setScene(scene); // Set the scene
    SimpleStage.show(); // Visualize the scent
  }

  public static void main(String[] args) {
    Application.launch(args); // Run our application
  }
}