java - 如何使用方法向面板添加按钮并从主面板访问它？

Question

假设我想创建一个向 StackPane 添加按钮的方法。然后我想访问该按钮，例如我想从 main 添加一个 EventHandler:

public class Test extends Application {

    @Override
    public void start(Stage primaryStage) throws ParseException {       

        StackPane root = new StackPane();
        addButton(root);
        // HERE I WANT TO ADD AN EVENT HANDLER TO b BUT I CANNOT ACCESS IT
        // b.addEventHandler(); 
        Scene scene = new Scene(root, 300, 250);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public void addButton(StackPane sp){
        final Button b = new Button("Test");
        sp.getChildren().add(b);
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

}

Answer 1

创建按钮时向按钮添加事件处理程序

public void addButton(StackPane sp){
    final Button b = new Button("Test");
    b.setOnAction(new EventHandler<ActionEvent>() {
       @Override 
       public void handle(ActionEvent e) {
                //your logic
       }});
    sp.getChildren().add(b);
}