使用Java Jackson反序列化json，并基于根元素调用与该根元素中的Json对象匹配的不同类

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.12.5</version>
</dependency>

import com.fasterxml.jackson.databind.ObjectMapper;

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

        try {
            ObjectMapper objectMapper = new ObjectMapper();
            RootElement rootElement = objectMapper.readValue(json, RootElement.class);

            // 根据根元素中的Json对象匹配不同的类
            if (rootElement.getRootElement() instanceof Person) {
                Person person = (Person) rootElement.getRootElement();
                // 处理Person对象
            } else if (rootElement.getRootElement() instanceof Company) {
                Company company = (Company) rootElement.getRootElement();
                // 处理Company对象
            } else {
                // 处理其他类型的对象
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

class RootElement {
    private Object rootElement;

    public Object getRootElement() {
        return rootElement;
    }

    public void setRootElement(Object rootElement) {
        this.rootElement = rootElement;
    }
}

class Person {
    private String name;
    private int age;

    // 省略getter和setter方法
}

class Company {
    private String companyName;
    private String address;

    // 省略getter和setter方法
}