gistfile1.scala

        Lens<Person, Address> personAddressLens = new Lens<Person, Address>() {
            @Override
            public Address get(@Nullable Person person) {
                return person.getAddress();
            }

            @Override
            public Person set(Person person, Address address) {
                return new Person(person.getFirstName(), person.getLastName(), address);
            }
        };

        Person person = new Person("Jack", "Smith", new Address("Default", "Default", "Default", 0));

        Lens<Person, Integer> personZipCodeLens = personAddressLens.andThen(addressZipCodeLens);

        personZipCodeLens.set(person, personZipCodeLens.get(person) + 1);