package sample;

public class Controller {
}

@@ -14,32 +14,239 @@
 e;%0A%0A
-public class Controller %7B%0A%7D
+import javafx.event.ActionEvent;%0Aimport javafx.scene.control.Label;%0A%0Apublic class Controller %7B%0A    public Label helloWorld;%0A%0A    public void sayHelloWorld(ActionEvent actionEvent) %7B%0A        helloWorld.setText(%22Hello World!%22);%0A    %7D%0A%7D%0A
 %0A

Update Controller.java