Java 11 Cookbook - Second Edition

How it works...

Using lambda expressions, we can rewrite the preceding code as follows:

Vehicle vehicle = new VehicleImpl(3000, 200);SpeedModel speedModel =  (t, wp, hp) -> {    double v = 2.0 * hp * 746 * t * 32.17 / wp;    return (double) Math.round(Math.sqrt(v) * 0.68);};vehicle.setSpeedModel(speedModel);System.out.println(vehicle.getSpeedMph(10.)); //prints: 122.0

We will discuss the lambda expressions format in the next recipe. For now, we would like only to point out the importance of functional interfaces for an implementation such as the preceding one. As you can see, there is only the name of the interface specified and no method name at all. That is possible because a functional interface has only one method that has to be implemented, ...