如何在不知道json键的情况下使用JsonReader从json读取值

import java.io.StringReader;
import java.io.IOException;
import com.google.gson.stream.JsonReader;

public class JsonReaderExample {
    public static void main(String[] args) {
        String json = "{\"name\":\"John\",\"age\":30,\"city\":\"New York\"}";

        try (JsonReader reader = new JsonReader(new StringReader(json))) {
            reader.beginObject();

            while (reader.hasNext()) {
                String key = reader.nextName();

                if (key.equals("name")) {
                    String name = reader.nextString();
                    System.out.println("Name: " + name);
                } else if (key.equals("age")) {
                    int age = reader.nextInt();
                    System.out.println("Age: " + age);
                } else if (key.equals("city")) {
                    String city = reader.nextString();
                    System.out.println("City: " + city);
                } else {
                    reader.skipValue();
                }
            }

            reader.endObject();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Name: John
Age: 30
City: New York