在JavaFx中使用退出按钮关闭Stage

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("JavaFx Close Stage Example");

        Button closeButton = new Button("退出");
        closeButton.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                primaryStage.close();
            }
        });

        StackPane root = new StackPane();
        root.getChildren().add(closeButton);
        primaryStage.setScene(new Scene(root, 300, 200));
        primaryStage.show();
    }
}