convert json into string in java code example

Example 1: how to convert jsonobject to string in java

JSONObject json = new JSONObject();

json.toString();

Example 2: convert json string to json object in java

try {
     JSONObject jsonObject = new JSONObject("{\"phonetype\":\"N95\",\"cat\":\"WP\"}");
}catch (JSONException err){
     Log.d("Error", err.toString());
}