How to connect button listener in javaFx

Question

The question seems simple, but there is a specific way I have to implement my code that is causing confusion. So in step #3 I need to register the source object with the event h

Answer 1

to register ButtonHandler with btn1 as pointed out by @c0der btn1.setOnAction(new ButtonHandler());

Answer 2

Use the setOnAction method of the Button class to define what will happen when a user clicks the button.

This snippet of code explain how we use anynomous class in method :

button.setOnAction(new EventHandler<ActionEvent>() {
    @Override public void handle(ActionEvent e) {
        label.setText("Accepted");
    }
});

We can override handle method in custom class and add it like this :

button.setOnAction(new CustomHandle());

You should know that ActionEvent is an event type that is processed by EventHandler. An EventHandler object provides the handle method to process an action fired for a button.

You can use the Button class to set as many event-handling methods as you need to cause the specific behavior or apply visual effects.In this case we use button.addEventHandler(EventType,EventObject).

button.addEventHandler(MouseEvent.MOUSE_ENTERED, 
    new EventHandler<MouseEvent>() {
        @Override public void handle(MouseEvent e) {
            button.setEffect(shadow);
        }
});