Check whether a value exists in a JSON object using Java

Question

I'm very new to Java and trying to find and check whether a particular value exists in JSON object. Here is my code,

String strUsers = representation.getText();     
JSONObject jsonObject = new JSONObject(strUsers);

    Iterator<String> keys = jsonObj.keys();
    while(keys.hasNext()) {
        String key = keys.next();
        String val = null;
        try {
             JSONObject value = jsonObj.getJSONObject(key);

        } catch(Exception e) {

        }
    }

Further I'm not able to understand how to check. Can any one guide me in achieving my goal?

Alessandro Roaro · Accepted Answer · 2014-07-18 08:29:57Z

5

You should use the method has.

if(jsonObject.has("your_key")) {
    // get the value and do something with it
}

In your try-catch block, before getting the value check if the key actually exists.

if (jsonObject.has(key)) {
    // then get the value
    JSONObject value = jsonObj.getJSONObject(key);
}

edited Jul 18, 2014 at 8:29

answered Jul 18, 2014 at 8:23

Alessandro Roaro

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1 Comment

user3668543 Over a year ago

Thanks Alessandro. Can you give me a very basic example?

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