How to generate JSONArray properly from Java?

Question

I'm trying to generate that kind of JSON String using Java (purpose : flot for Android) :

{
"data": [[1999, 1], [2000, 0.23], [2001, 3], [2002, 4], [2003, 1.3], [2004, 2.5], [2005, 2.0], [2006, 3.1], [2007, 2.9], [2008, 0.9]]
}

To do this, I'm using JSONArray like this :

JSONArray jsonArray = new JSONArray();
jsonArray.put("[1999, 1]");
jsonArray.put("[2000, 0.23]");
jsonArray.put("[2001, 3]");
...

But the only result I get is this :

["[1999, 1]","[2000, 0.23]","[2001, 3]",..."[2008, 0.9]"]

How Can I remove quote between brackets ? Can I type the items of my array ?

Thanks in advance!

Sean Patrick Floyd · Accepted Answer · 2012-01-27 08:08:18Z

5

What you are doing is just adding Strings to the array. You don't want Strings, you want nested arrays. So you have to work with nested JSONArray objects:

Here's the standard way:

JSONArray nested1 = new JSONArray();
nested1.put(1999);
nested1.put(1);
jsonArray.put(nested1);

Or, simpler:

jsonArray.put(new JSONArray(Arrays.asList(1999, 1)));

Or, even simpler:

jsonArray.put(Arrays.asList(1999, 1));
// or use an int array:
jsonArray.put(new int[]{1999, 1});

edited Jan 27, 2012 at 8:08

answered Jan 27, 2012 at 8:00

Sean Patrick Floyd

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1 Comment

Thordax Over a year ago

Thanks a lot for the quick an exhaustive answer ! This works just great!

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