// Use the builder to create the car.
Car saab = Car.build().withLengthInCentimeters(434).withName("Saab").withColor("Blue").withOwner(
Owner.build().withSsn("197707071122").withName("Bull")).asCar();
// Name and lengthInCentimeters are mandatory, weightInKilograms is optional.
Bus bus = Bus.name("Some").lengthInCentimeters(5100).withWeightInKilograms(3200).asBus();
System.out.println(volvo);
System.out.println(saab);
System.out.println(bus);
System.out.println("Volvo is big: " + volvo.isBig());