ZooParser.java

public class ZooParser {

    private String mResponse;
    private Zoo mZoo;
    private List<Zoo> mZooList;
    private List<Animal> mAnimalList;
    private Gson mGson;

    public ZooParser(String response) {
        mResponse = response;
        mGson = new Gson();
    }

    public void parseZooList() {
        if (mResponse != null) {
            Zoo[] zoos = mGson.fromJson(mResponse, Zoo[].class);
            mZooList = Arrays.asList(zoos);
        }
    }

    public void parseZoo() {
        if (mResponse != null) {
            mZoo = mGson.fromJson(mResponse, Zoo.class);
        }
    }

    public Zoo getZoo() {
        return mZoo;
    }

    public List<Zoo> getZooList() {
        return mZooList;
    }

    public List<Animal> getAnimalList() {
        return mAnimalList;
    }
}