马老师Python全系列大师课
不使用Optional
/**
* * @param person
* @return
*/public static String getCarInsuranceName(Person person) {
// if (person == null) {
return "Unknown";
}
// Car car = person.getCar();
if (car == null) {
return "Unknown";
}
//对 Insurance insurance = car.getInsurance();
if (insurance == null) {
return "Unknown";
}
return insurance.getName();}
