gistfile1.scala

        Lens<Address, Integer> addressZipCodeLens = lens(
                new Function<Address, Integer>() {
                    @Override
                    public Integer apply(@Nullable Address address) {
                        return address.getZipCode();
                    }
                },
                new Function2<Address, Integer, Address>() {
                    @Override
                    public Address apply(Address address, Integer zipCode) {
                        return new Address(address.getStreet(), address.getCity(), address.getState(), zipCode);
                    }
                }
        );