App.java

import com.google.gson.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.Map;

/**
 * Part 1: Create a Java Application to Read and Manipulate Data
 * -------
 *
 * Requirement:
 *
 * - Utilize Java 6 or later
 *
 * Features:
 *
 * - Retrieve data from the following URL and parse the JSON
 *
 * URL: https://gist.githubusercontent.com/jed204/92f90060d0fabf65792d6d479c45f31c/raw/346c44a23762749ede009623db37f4263e94ef2a/java2.json
 *
 * - Add all the recv and sent values for totals of each field and present the results
 *
 *
 * Notes:
 *
 * - Console Application or Web App (your call!)
 * - Use appropriate amounts of error handling
 * - You can use external libraries to support implementing the features (if desired or needed)
 * - Create a repo/gist on GitHub for your results
 *
 *
 *  Dependencies:
 *  gson (https://github.com/google/gson)
 */

public class App {

    public static String getData(String urlString) throws IOException {
        BufferedReader reader = null;
        try {
            URL url = new URL(urlString);
            reader = new BufferedReader(new InputStreamReader(url.openStream()));
            StringBuffer buffer = new StringBuffer();
            int read;
            char[] chars = new char[1024];
            while ((read = reader.read(chars)) != -1)
                buffer.append(chars, 0, read);

            return buffer.toString();
        } finally {
            if (reader != null)
                reader.close();
        }
    }


    public static void main(String args[]) throws IOException {
        final String URL = "https://gist.githubusercontent.com/jed204/92f90060d0fabf65792d6d479c45f31c/raw/346c44a23762749ede009623db37f4263e94ef2a/java2.json";

        parseJSON(URL);
    }



    public static void parseJSON(String URL) throws IOException {
        // Get Data from URL
        String jsonString = getData(URL);

        // Parse JSON string and conver to JSON Object
        JsonParser parser = new JsonParser();
        JsonObject object = (JsonObject)parser.parse(jsonString);

        // Iterate through each entry (fields starting with c)
        for (Map.Entry<String,JsonElement> entry : object.entrySet()) {
            // Get value returned as a JSON object
            JsonObject value = entry.getValue().getAsJsonObject();
          
            // Declare/Initalize sum total for sent and receive
            double sentTotal = 0;
            double recvTotal = 0;
            // Print out current key
            System.out.println("Field --> " + entry.getKey());
            // Iterate through the value's objects'
            for(Map.Entry<String, JsonElement> inner : value.entrySet()) {
                JsonObject json = inner.getValue().getAsJsonObject();
                // Parse the sent and recv and add them to the counter
                sentTotal += json.get("sent").getAsDouble();
                recvTotal += json.get("recv").getAsDouble();

            }
            // Print result for the current field to console 
            System.out.println("Sent --> " + sentTotal);
            System.out.println("Received --> " + recvTotal);
            System.out.println();
        }
    }


}