在Java中解析JSON时找不到JSONObject[“sum

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonParser {
    public static void main(String[] args) {
        String json = "{\"name\":\"John\",\"age\":25,\"scores\":[85,90,95]}";

        ObjectMapper mapper = new ObjectMapper();
        try {
            JsonNode rootNode = mapper.readTree(json);

            // 获取"name"字段的值
            String name = rootNode.get("name").asText();
            System.out.println("Name: " + name);

            // 获取"age"字段的值
            int age = rootNode.get("age").asInt();
            System.out.println("Age: " + age);

            // 获取"scores"字段的值
            JsonNode scoresNode = rootNode.get("scores");
            for (JsonNode scoreNode : scoresNode) {
                int score = scoreNode.asInt();
                System.out.println("Score: " + score);
            }

            // 获取"sum"字段的值
            JsonNode sumNode = rootNode.get("sum");
            if (sumNode != null) {
                int sum = sumNode.asInt();
                System.out.println("Sum: " + sum);
            } else {
                System.out.println("Field 'sum' not found.");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}