如何向序列化对象添加属性？

import json

# 反序列化
serialized_obj = '{"name": "John", "age": 30}'
obj = json.loads(serialized_obj)

# 添加属性
obj["email"] = "john@example.com"

# 序列化
new_serialized_obj = json.dumps(obj)

import com.fasterxml.jackson.databind.ObjectMapper;

// 反序列化
String serializedObj = "{\"name\": \"John\", \"age\": 30}";
ObjectMapper objectMapper = new ObjectMapper();
MyObject obj = objectMapper.readValue(serializedObj, MyObject.class);

// 添加属性
obj.setEmail("john@example.com");

// 序列化
String newSerializedObj = objectMapper.writeValueAsString(obj);