org.json.simple。获取唯一嵌套值

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class Main {
    public static void main(String[] args) {
        String jsonString = "{ \"name\": \"John\", \"age\": 30, \"address\": { \"city\": \"New York\", \"country\": \"USA\" } }";
        
        JSONParser parser = new JSONParser();
        
        try {
            JSONObject jsonObject = (JSONObject) parser.parse(jsonString);
            
            // 获取嵌套值
            String cityName = (String) ((JSONObject) jsonObject.get("address")).get("city");
            
            System.out.println("City Name: " + cityName);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}