有没有办法用对象到对象的语法来转换字符串？

var obj = { name: "John", age: 30, city: "New York" };
var jsonString = JSON.stringify(obj);
console.log(jsonString);

import json

obj = {"name": "John", "age": 30, "city": "New York"}
jsonString = json.dumps(obj)
print(jsonString)

import com.google.gson.Gson;

class Person {
    String name;
    int age;
    String city;
}

public class Main {
    public static void main(String[] args) {
        Person person = new Person();
        person.name = "John";
        person.age = 30;
        person.city = "New York";

        Gson gson = new Gson();
        String jsonString = gson.toJson(person);
        System.out.println(jsonString);
    }
}