Creating JSON String Using CLASSES

In Json String basically we have two types of Variables

1. JSONObject – {}

2. JSONArray  - []

JSONObject allows to store values in the form of key,value pair.

JSONArray allows to store values in the form of array.

Insert data into JSONObject use put(key,value);

Insert data into JSONArray use put(value);

put(key,value) is a method to store data into JSONObject.

put(key) is a method to store data into JSONArray.

1. Construct JsonObject

// creating JsonObject

JSONObject jsonObject = new JSONObject();

// inserting value into JsonObject syntax

jsonObject.put(key, value);                        

// inserting name into JsonObject

jsonObject.put("name", "venkat");

// inserting phno into JsonObject

jsonObject.put("phno", 1234567890);

// inserting city into JsonObject

jsonObject.put("city", "Hyd");

// showing JsonObject

Log.e("jsonObject", jsonObject.toString());

Output

************************************

{ 
   "name":"venkat",
   "phno":1234567890,
   "city":"Hyd"
}

************************************               

2. JsonObject inside another JsonObject            

// creating json objects

JSONObject outerObject = new JSONObject();

JSONObject innerObject = new JSONObject();

                            

// inserting values into inner object

innerObject.put("name", "venkat");

innerObject.put("phno", 1234567890);

innerObject.put("city", "Hyd");

                            

// inserting inner object into outer object

outerObject.put("object", innerObject);

                            

// showing outer object

Log.e("outerObject", outerObject.toString());

               

Output

************************************

{ 
   "object":{ 
      "name":"venkat",
      "phno":1234567890,
      "city":"Hyd"
   }
}   

************************************

3. Construct JsonArray         

// creating json array

JSONArray jsonArray = new JSONArray();

jsonArray.put("venkat");

jsonArray.put("Hyd");

jsonArray.put("0123456789");

                            

// showing jsonarray

Log.e("jsonarray", jsonArray.toString());

Output

************************************

[ 
   "venkat",
   "Hyd",
   "0123456789"
]              

************************************

             

4. JsonArray inside JsonArray

// creating json arrays

JSONArray innerArray = new JSONArray();

JSONArray outerArray = new JSONArray();

// inserting values into inner array

innerArray.put("venkat");

innerArray.put("Hyd");

innerArray.put("0123456789");

// inserting inner array into outer array

outerArray.put(innerArray);

// showing outer array

Log.e("outer array", outerArray.toString());

Output

************************************

[ 
   [ 
      "venkat",
      "Hyd",
      "0123456789"
   ]
]             

************************************

5. JsonObject inside JsonArray

// creating json object

JSONObject jsonObject = new JSONObject();

// creating json array

JSONArray jsonArray = new JSONArray();

// inserting values into json array

jsonArray.put("venkat");

jsonArray.put("Hyd");

jsonArray.put("0123456789");

// inserting json array into json object

jsonObject.put("array", jsonArray);

// showing jsonObject

Log.e("jsonobject", jsonObject.toString());

Output

************************************

{ 
   "array":[ 
      "venkat",
      "Hyd",
      "0123456789"
   ]
}              

************************************

             

6. JsonArray inside JsonObject

// creating json array

JSONArray jsonArray = new JSONArray();

// creating json object

JSONObject jsonObject = new JSONObject();

// inserting values into json object

jsonObject.put("name", "venkat");

jsonObject.put("phno", "0123456789");

jsonObject.put("city", "Hyd");

// inserting json object into json array

jsonArray.put(jsonObject);

// showing jsonarray

Log.e("jsonarray", jsonArray.toString());

Output

************************************

 [ 
   { 
      "name":"venkat",
      "phno":"0123456789",
      "city":"Hyd"
   }
]             

************************************