PriorityBasedDefaultProperty.java

  //Address has priority , first home and then Office

Optional<String> address = Stream
                .of(person.getHome().map(Home::getAddress), person.getOffice().map(Office::getAddress))
                .filter(Optional::isPresent)
                .map(Optional::get)
                .findFirst();

        address
                .ifPresent(add -> System.out.println("Contacting at address " + add));