JSON array get length

Question

I can't get the array length of the JSON array. when I using length(); method it is not working, it show as red underline in Netbeans

this is the source code

 try {

        JSONObject myjson = JSONObject.fromObject(practiceInfoByUsername);

        //JSONArray nameArray = myjson.names();
        final JSONArray jar = myjson.getJSONArray("_types");
        for(int i=0; i<jar.length(); i++)
        {
            String p = jar.getString(i);
            Log.i("p",p);


        }

    } catch (JSONException e) {
            e.printStackTrace();
    }

Does it compile? May be issue with netbean's highlighting.

Mikita Belahlazau
– Mikita Belahlazau

2012-02-13 21:22:55 +00:00
Commented Feb 13, 2012 at 21:22 — Mikita Belahlazau
– Mikita Belahlazau, Commented Feb 13, 2012 at 21:22

A.D. · Accepted Answer · 2015-07-08 12:35:36Z

51

Note: if you're using(importing) org.json.simple.JSONArray, you have to use JSONArray.size() to get the data you want. But use JSONArray.length() if you're using org.json.JSONArray.

edited Jul 8, 2015 at 12:35

A.D.

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answered Nov 8, 2014 at 14:23

JMiao

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Comments

CJ Mendes · Accepted Answer · 2012-11-04 20:11:16Z

7

have you tried size() ? Something like :

jar.size();

Hope it helps.

answered Nov 4, 2012 at 20:11

CJ Mendes

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Comments

laaposto · Accepted Answer · 2014-05-09 14:25:21Z

4

I came here and looking how to get the number of elements inside a JSONArray. From your question i used length() like that:

JSONArray jar = myjson.getJSONArray("_types");
System.out.println(jar.length());

and it worked as expected. On the other hand jar.size();(as proposed in the other answer) is not working for me.

So for future users searching (like me) how to get the size of a JSONArray, length() works just fine.

answered May 9, 2014 at 14:25

laaposto

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Comments

Sudershan · Accepted Answer · 2015-06-30 21:19:53Z

2

The below snippet works fine for me(I used the size())

String itemId;
            for (int i = 0; i < itemList.size(); i++) {
            JSONObject itemObj = (JSONObject)itemList.get(i);
            itemId=(String) itemObj.get("ItemId");
            System.out.println(itemId);
            }

If it is wrong to use use size() kindly advise

answered Jun 30, 2015 at 21:19

Sudershan

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Comments

thedayofcondor · Accepted Answer · 2012-11-04 20:18:51Z

0

Check you have the line:

 import org.json.JSONArray;

at the top of your source code

answered Nov 4, 2012 at 20:18

thedayofcondor

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Comments

Bhargav · Accepted Answer · 2015-01-14 07:12:55Z

0

The JSONArray.length() returns the number of elements in the JSONObject contained in the Array. Not the size of the array itself.

answered Jan 14, 2015 at 7:12

Bhargav

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Comments

Simon Nitzsche · Accepted Answer · 2016-07-07 20:55:05Z

0

At my Version the function to get the lenght or size was Count()

You're Welcome, hope it help someone.

answered Jul 7, 2016 at 20:55

Simon Nitzsche

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