Car.java

public class Car {
    public static CarBuilder builder() {
      return new CarBuilder();
    }
  
    public static class CarBuilder {
      private CarType type;
      private int seats;
      private Engine engine;
      private Transmission transmission;
      private TripComputer tripComputer;
      private GPSNavigator gpsNavigator;
      private CarBuilder() {
        // inicializa valores default
      }
      
      public CarBuilder type(CarType type) {
        this.type = type;
        return this;
      }
      
      // segue o padrão
      
      public Car build() {
        return new Car(this);
      }
    }
    private CarType type;
    private int seats;
    private Engine engine;
    private Transmission transmission;
    private TripComputer tripComputer;
    private GPSNavigator gpsNavigator;
  
   public Car() {}
   public Car(CarBuilder) {
     // inicializa todos os valroes
   }
   // getters, setters, hashCode, equals e toString
}