Iterować przez sznurka JSON i uzyskać klucz i wartość obu

Jedną z wielu opcji jest użycie Gson za pomocą TypeAdapter i pozwól, co zakładam, jest obiekt Person do zakodowania i dekodowania za pomocą kluczy dynamicznych.

    static class Person {

        private final String firstName;

        private final String lastName;

        Person(String firstName, String lastName) {
            this.firstName = firstName;
            this.lastName = lastName;
        }

        public String getFirstName() {
            return firstName;
        }

        public String getLastName() {
            return lastName;
        }
    }

   static class PersonTypeAdapter extends TypeAdapter<Person> {

        private final String firstNameKey;

        private final String lastNameKey;

        PersonTypeAdapter(String firstNameKey, String lastNameKey) {
            this.firstNameKey = firstNameKey;
            this.lastNameKey = lastNameKey;
        }

        @Override
        public void write(JsonWriter out, Person value) throws IOException {
            out.beginObject()
                    .name(firstNameKey).value(value.firstName)
                    .name(lastNameKey).value(value.lastName)
                    .endObject();
        }

        @Override
        public Person read(JsonReader in) throws IOException {
            in.beginObject();

            String firstNameValue = null;

            String lastNameValue = null;

            while (in.hasNext()) {
                String key = in.nextName();

                if (key.equals(firstNameKey)) {
                    firstNameValue = in.nextString();
                } else if (key.equals(lastNameKey)) {
                    lastNameValue = in.nextString();
                } else {
                    throw new UnsupportedOperationException("Unsupported key.");
                }
            }
            in.endObject();

            if (firstNameValue == null || lastNameValue == null) {
                throw new IllegalStateException("First name or last name is null.");
            }

            return new Person(firstNameValue, lastNameValue);
        }
    }

        String json = "{\"First Name\":\"John\",\"Last Name\":\"Doe\"}\n" +
                "\n";

        Gson gson = new GsonBuilder()
                .registerTypeAdapter(Person.class, new PersonTypeAdapter("First Name", "Last Name"))
                .create();

        Person person = gson.fromJson(json, Person.class);

Json result: com.Solution$Person@5f4da5c3[firstName=John,lastName=Doe]