public static JSONObject of(String k1, Object v1, String k2, Object v2) {
        JSONObject object = new JSONObject(2, 1F);
        object.put(k1, v1);
        object.put(k2, v2);
        return object;
    }
Pack two key-value pairs as {@link JSONObject}

<pre>
JSONObject jsonObject = JSONObject.of("key1", "value1", "key2", "value2");
</pre>

@param k1 first key
@param v1 first value
@param k2 second key
@param v2 second value
@since 2.0.2
core/src/main/java/com/alibaba/fastjson2/JSONObject.java