Java 11 Cookbook - Second Edition

How to do it...

1. Create the Engine class as an inner class of the Vehicle class:

        public class Vehicle {          private int weightPounds;          private Engine engine;          public Vehicle(int weightPounds, int horsePower) {            this.weightPounds = weightPounds;            this.engine = new Engine(horsePower);          }          public double getSpeedMph(double timeSec){            return this.engine.getSpeedMph(timeSec);          }          private int getWeightPounds(){ return weightPounds; }          private class Engine {            private int horsePower;            private Engine(int horsePower) {              this.horsePower = horsePower;            }            private double getSpeedMph(double timeSec){              double v = 2.0 * this.horsePower * 746 *                          timeSec * 32.17 / getWeightPounds();              return Math.round(Math.sqrt(v) * 0.68);            }          }        }

2. Notice that the getSpeedMph(double timeSec) method ...