Gson.java

import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Gson {

	private static final String USER_AGENT  = "MyUserAgent";// Change this!
	private static final String REQUEST_URL = "https://api.spiget.org/v2/resources/12345";

	public static void main(String[] args) {
		try {
			URL url = new URL(REQUEST_URL);
			HttpURLConnection connection = (HttpURLConnection) url.openConnection();
			connection.addRequestProperty("User-Agent", USER_AGENT);// Set User-Agent

			// If you're not sure if the request will be successful,
			// you need to check the response code and use #getErrorStream if it returned an error code
			InputStream inputStream = connection.getInputStream();
			InputStreamReader reader = new InputStreamReader(inputStream);

			// This could be either a JsonArray or JsonObject
			JsonElement element = new JsonParser().parse(reader);
			if (element.isJsonArray()) {
				// Is JsonArray
			} else if (element.isJsonObject()) {
				// Is JsonObject
			} else {
				// wut?!
			}

			// TODO: process element
			System.out.println(element);
		} catch (IOException e) {
			// TODO: handle exception
			e.printStackTrace();
		}
	}

}