JavaFX: Create EventHandler
<p>I'm writting an event handler for a button, on the net I saw a lot of codes like this:</p>

<pre><code>b = new Button("click me");
    b.setOnMouseClicked(new EventHandler&lt;MouseEvent&gt;() {

        @Override
        public void handle(MouseEvent t) {
        /*
            calling several oblects' methods and doing things
        */
        }
    });
</code></pre>

<p>If I have a method like <code>setGUI</code> and I must create several buttons and several <code>eventhandlers</code>, the question is: is it ok to put a lot of "action" there? If I have 10 <code>buttons</code> and every button has an <code>event handler</code> then my <code>setGUI</code> will be like 500 lines long, maybe even more. I tried to create an event handler object in this way:</p>

<pre><code>public class MyListener implements EventHandler{
@override
public void handle(Event event) {
        //My code
    }
}
</code></pre>

<p>But EventHandler is Abstract and I have to implement several methods.
Googling I saw this code:</p>

<pre><code>public class AppWithEvents1 extends Application {
    Text text=null;
    public void start(Stage stage) {
        text=new Text(10,50,"Non hai mai cliccato ");
        Button btn = new Button();
        btn.setText("Click me");
        Listener a=new Listener(this);
        btn.addEventHandler(ActionEvent.ACTION, a);
        Group root = new Group(btn);
        root.getChildren().add(text);
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();
    }
    public void updateText(int n){
        text.setText("Hai cliccato "+n
        +" volte");
    }
    public static void main(String[] args) {
        Application.launch(args);
    }
} 
</code></pre>

<p>and he created this class:</p>

<pre><code>class Listener
    implements EventHandler{
        AppWithEvents1 awe=null;
        int counter=0;
        Listener(AppWithEvents1 a){
            awe=a;
        }
    public void handle(Event t) {
        awe.updateText(++counter);
    }
}
</code></pre>

<p>Why didn't he implement all abstract methods?</p>