Learn Java for Web Development

APPENDIX C: Introduction to Scala 433

33. val vehicle2 = new Bike(100)


34. val vehicle3 = new Batmobile(300)


35. 
    


36. val vehicleList = List(vehicle1, vehicle2, vehicle3)


37. val fastestVehicle = vehicleList.maxBy(_.mph)


38. 
    


39. printVehicle


40. 
    


41. def printVehicle{


42. println ("speed of Bike : " + vehicle1.mph);


43. println ("speed of Car : " + vehicle2.mph);


44. println ("speed of Batmobile : " + vehicle3.mph);


45. println ("Fastest Vehicle : " + fastestVehicle.mph + " mph");


46. 
    


47. }


48. }


49. }

When the previous code is compiled and executed, it produces the following result:

scalac vehicle.scala
scala Vehicle

speed of Bike : 200 mph

speed of Car : 100 mph

speed of Batmobile : 300 mph

Fastest Vehicle : 300 mph

Summary

This appendix introduced you to the basics of Scala. You learned three ways to interactively
execute Scala code as a script and as a compiled program. Then you learned how to use the Scala
collections library. Finally, you learned how to use traits and how to use a singleton object in an
application.