I am currently writing some code in a servlet that gets data from the database and returns it to the client. What I am having problems with is inserting the array of dates I have collected and adding them to my JSON object that I will return to the client.
Here is the code I'm trying but it keeps giving errors
dates = ClassdatesDAO.getdate(dates);
ArrayList<String> ClassDates = new ArrayList<String>();
ClassDates = dates.getClassdates();
response.setContentType("application/json");
JSONObject Dates = new JSONObject();
Dates.put("dates", new JSONArray(ClassDates));
In my IDE I get this error over the ClassDates
in the JSONArray
The constructor JSONArray(ArrayList) is undefined
You are passing ArrayList
instance instead of an Array
. So, convert the list into an array and then pass it as an argument like this
Dates.put("dates", new JSONArray(ClassDates.toArray(new String[ClassDates.size()])));
Note : json
API has a method signature accepting java.util.Collection
. So, you are using some other library or older version
JSONObject Dates = new JSONObject();
JSONArray datesJSONArray = new JSONArray();
for (String date : ClassDates)
datesJSONArray.put(date);
try {
Dates.put("dates", datesJSONArray);
} catch (JSONException e) {
e.printStackTrace();
}
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