Comparing Vaadin/Java and Scaladin

greeting_button.java

final Button greetButton = new Button("Greet");
greetButton.addClickListener(new Button.ClickListener() {
  public void buttonClick(ClickEvent event) {
    Notification.show("Hi there!");
  }
});

greeting_button.scala

val greetButton = new Button("Greet") {
  clickListeners += Notification.show("Hi there!")
}