Json array in Java

Question

I have a JSON array:

**
**
 {
      "Required" : true,
      "Validation" : {
        "MaxChars" : "40"
        "MinChars" : "10"
      }
  }
**
**

The code now:

 JSONObject formField = formListAdapter.formArray.getJSONObject(i);

 if(formField.has("Required") && formField.getBoolean("Required") == true){

 }

With the aforementioned code, I can check if in the JSON there is a field with the name "Required" and if this is true. But how can check if the Validation has an attribute inside? and how can I check the name and the value of it? I.e. how can I check the number of the MaxChars or MinChars?

Rahul · Accepted Answer · 2012-12-31 13:02:53Z

2

You can use JSONObject#getJSONObject to get the JSONObject corresponding to the key and then you can perform the same operations to get the values from the key.

JSONObject validationObject = formField.getJSONObject("Validation");

or you can use a better way, Use jackson

answered Dec 31, 2012 at 13:02

Rahul

16.4k4 gold badges44 silver badges64 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Reimeus · Accepted Answer · 2012-12-31 21:13:04Z

1

JSONObject validationObject = jsonObject.getJSONObject("Validation");
if (validationObject.has("MaxChars")) {
   int maxChars = validationObject.getInt("MaxChars");
   ...
}

// same for MinChars

To get the attribute names for validationObject, you can use:

String[] names = JSONObject.getNames(validationObject);

answered Dec 31, 2012 at 21:13

Reimeus

160k16 gold badges225 silver badges282 bronze badges

Comments

Fussel · Accepted Answer · 2012-12-31 12:51:20Z

0

You have to check the values of the "Validiation" object. I never had worked with json.org but i belive you can create a new JSONObject from it and read the values like you work with the object in the array.

answered Dec 31, 2012 at 12:51

Fussel

1231 gold badge1 silver badge9 bronze badges

Comments

Brian Agnew · Accepted Answer · 2012-12-31 12:53:15Z

0

You want JSONObject.getJSONObject(String field) to get the enclosed JSON object.

answered Dec 31, 2012 at 12:53

Brian Agnew

273k38 gold badges342 silver badges443 bronze badges

Collectives™ on Stack Overflow

Json array in Java

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related