Can you run?I can not successfully run the OptionalMain.java.What went wrong,Here
public String getCarInsuranceName(Optional<Person> person) { return person.flatMap(Person::getCar) .flatMap(Car::getInsurance) .map(Insurance::getName) .orElse("Unknown"); }
Can you run?I can not successfully run the OptionalMain.java.What went wrong,Here
public String getCarInsuranceName(Optional<Person> person) { return person.flatMap(Person::getCar) .flatMap(Car::getInsurance) .map(Insurance::getName) .orElse("Unknown"); }
I got NullPointException.The Exception: