馬老師Python全系列大師課
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";
? ?}
? ?//對? ??Insurance insurance = car.getInsurance();
? ?if (insurance == null) {
? ? ? ?return "Unknown";
? ?}
? ?return insurance.getName();}
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