Play with Java and Scala - Learn Java for Web Development - page 367

Now you can run the helloworld-scala project using the run command from the Play console, as
illustrated in Figure 8-19 .
Figure 8-19. Play console for helloworld-scala application
Now you will look at the controller generated by Play 2 for helloworld-scala (see Listing 8-4). You
can find the controller in helloworld-scala\app\controllers .
Listing 8-4. Application Controller in Scala
1. package controllers
2.
3. import play.api._
4. import play.api.mvc._
5.
6. object Application extends Controller {
7.
8. def index = Action {
9. Ok(views.html.index("Your new application is ready."))
10. }
11.
12. }
 Line 6 : As you can see on line 6, in Java controller is a class, but in Scala the
controller is an object.
 Line 8 : As you can see on line 8, in Java action is a static method, but in Scala
an action is a function (an object's method).
 Line 9 : The return type and keyword are missing if you compare this to the Java
controller.
 Line 9 : Scala uses a structure called Action , which is a block of code executor.
Now that you have seen the controller in Scala, which differs from a Java controller syntactically,
it is time to see the template in helloworld-scala (see Listing 8-5), which you can find in
helloworld-scala\app\views .