获取JSONArray的密钥字符串

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class Main {
    public static void main(String[] args) {
        String jsonStr = "[{\"key1\": \"value1\"}, {\"key2\": \"value2\"}, {\"key3\": \"value3\"}]";

        try {
            JSONArray jsonArray = new JSONArray(jsonStr);
            StringBuilder keys = new StringBuilder();

            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                keys.append(jsonObject.keys().next());

                if (i < jsonArray.length() - 1) {
                    keys.append(", ");
                }
            }

            String keysStr = keys.toString();
            System.out.println(keysStr);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}