package sample;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.stage.WindowEvent;

public class Main extends Application {

  @Override
  public void start(Stage primaryStage) throws Exception{
    Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
    primaryStage.setTitle("Hello World");
    primaryStage.setScene(new Scene(root, 300, 275));
    primaryStage.show();

    primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
      @Override
      public void handle(WindowEvent event) {
        System.out.print("監(jiān)聽到窗口關(guān)閉");
      }
    });
  }

  public static void main(String[] args) {
    launch(args);
  }
}

   primaryStage.setOnCloseRequest(new EventHandler<WindowEvent>() {
      @Override
      public void handle(WindowEvent event) {
        System.out.print("監(jiān)聽到窗口關(guān)閉");
      }
    });