Simple Convert Json with GSON

ConvertJakson.java

public class ConvertJakson {
 private JsonData jsonData;
 private Gson gson;
 private String json;
 
 public ConvertJakson() {
  Log.i("Hasil Json : ", jsonData + "");
  String data = objJson();
  Log.i("ConvetJakson : ", data + "");
 
 }
 
 public String objJson() {
  jsonData = new JsonData();
  gson = new Gson();
  json = gson.toJson(jsonData);
  return json;
 }
}

JsonData.java

public class JsonData {
 private String nama = "aku";
 private int nim = 123;
 @SuppressWarnings("serial")
 private List<String> hoby = new ArrayList<String>() {
  {
   add("Futsal");
   add("Tenis");
   add("Badminton");
  }
 };
 @Override
 public String toString() {
  return "JsonData [nama=" + nama + ", nim=" + nim + ", hoby=" + hoby
    + "]";
 }
 
 
}

MainActivity.java

public class MainActivity extends Activity {
 private ConvertJakson jakson;
 private Gson gson;
 private JsonData jsonData;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  gson = new Gson();
  jakson = new ConvertJakson();
 
  try {
   jsonData = new JsonData();
   String json = jakson.objJson();
   jsonData = gson.fromJson(json, JsonData.class);
 
  } catch (Exception exception) {
   Log.i("MAIN : ", exception + "");
  }
  Log.i("MAIN : ", jakson + "");
  Log.i("MAIN : ", jsonData + "");
 }
}