gistfile1.java

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

class Response {
    protected String message;
    protected int status;

    public String getMessage() {
        return message;
    }

    public int getStatus() {
        return status;
    }
}

class ScoreResponse extends Response {
    ScoreInner score;

    public ScoreInner getScore() {
        return score;
    }

    @Override
    public String toString() {
        return "ScoreResponse{" +
                "message=" + message +
                ", status=" + status +
                ", score=" + score +
                '}';
    }

    private static class ScoreInner {
        private int success;
        private int fail;
        private int points;

        @Override
        public String toString() {
            return "ScoreInner{" +
                    "success=" + success +
                    ", fail=" + fail +
                    ", points=" + points +
                    '}';
        }
    }
}

public class Main {
    public static void main(String[] args) {
        String json = "{score: {\n" +
                "            success: 5,\n" +
                "            fail: 2,\n" +
                "            points: 10\n" +
                "            },\n" +
                "            message: \"message\",\n" +
                "            status: 200\n" +
                "         }";
        Gson gson = new GsonBuilder().create();

        ScoreResponse scoreResponse = gson.fromJson(json, ScoreResponse.class);
        System.out.println(scoreResponse.toString());
    }
}