How to get the json object names dynamically in java

Question

I have the below json sample and i would like to get the object names dynamically without passing as string.

{
    "John": {
        "Age": "22",
        "status": "married"
    },
    "Ross": {
        "Age": "34",
        "status": "divorced"
    }
}

I want to get keys John and Ross. I tried with

JSONObject parse = JSON.parseObject("");
for (Map.Entry<String, Object> entry : parse.entrySet()) {
    System.out.println(entry.getKey() + "=" + entry.getValue());
}

but the above code gives all the keys inside. i only want the parent keys.

Answer 1

you can change parse.entrySet() to parse.keySet() to get the desire result.

JSONObject parse = JSON.parseObject("");
for (Map.Entry<String, Object> entry : parse.keySet()) {
    System.out.println(entry.getKey() + "=" + entry.getValue());
}

Answer 2

Assuming the use of fastjson. Use keySet instead.

JSONObject parse = JSON.parseObject("");
for (String entry : parse.keySet()) {
    System.out.println(entry);
}

This will print:

John
Ross

Tested with:

String s = "{\"John\":{\"Age\":\"22\",\"status\":\"married\"},\"Ross\":{\"Age\":\"34\",\"status\":\"divorced\"}}";

JSONObject parse = JSON.parseObject(s);
for (String entry : parse.keySet()) {
    System.out.println(entry);
}