如何在java中修改json字符串？

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonModificationExample {
    public static void main(String[] args) {
        try {
            // JSON字符串
            String jsonString = "{\"name\":\"John\",\"age\":30}";

            // 创建ObjectMapper对象
            ObjectMapper objectMapper = new ObjectMapper();

            // 解析JSON字符串为Java对象
            MyObject myObject = objectMapper.readValue(jsonString, MyObject.class);

            // 修改Java对象的属性值
            myObject.setName("Alice");
            myObject.setAge(25);

            // 将修改后的Java对象转换为JSON字符串
            String modifiedJsonString = objectMapper.writeValueAsString(myObject);

            System.out.println(modifiedJsonString);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    // 定义一个Java对象类
    static class MyObject {
        private String name;
        private int age;

        // 省略构造方法、getter和setter

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getAge() {
            return age;
        }

        public void setAge(int age) {
            this.age = age;
        }
    }
}