CODEWITHSUNDEEP
javajson
polym
polym

Reputation: 658

Get json key name from json.javax.JsonObject?

Suppose I have a JsonObject from javax named jsonObject, which looks like this: {"key":"value"}

How can I get the key name key?

I only find methods like getJsonString to get the key value value, but not the name of the key itself.

Background:

I have a Json Array, which contains key-value pairs. I want to know the name of the key on a specific index i.

Example:

[{"key1":"value0"},{"key1":"value1"},{"key2","value2"}]

key1 here is a success, key2 is a fail and has to be checked.

Upvotes: 0

Views: 4905

Answers (1)

Chris Nauroth
Chris Nauroth

Reputation: 9844

JsonObject implements Map<String, JsonValue>. You can call jsonObject.keySet() to access the keys, or call jsonObject.entrySet() to get a complete view of the object including both keys and values.

for (String key: jsonObject.keySet()) {
    System.out.println(key);
}

In the context of the problem you described, it sounds like you'll want to validate that each array element contains an object with exactly one key-value pair. Perhaps something like this:

Set<Map.Entry<String, JsonValue>> kvPairs = jsonObject.entrySet();
if (kvPairs.size() == 1) {
    for (Map.Entry<String, JsonValue> kvPair: kvPairs) {
        if (kvPair.getKey().equals("key1")) {
            // success
        } else {
            // error handling
        }
    }
} else {
    // error handling
}

Upvotes: 3

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