Learn Java for Web Development

CHAPTER 8: Play with Java and Scala 371

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.