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来吧，展示！

package XXX;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.IOException;

public class Test {

    /**
     * 测试：不同类中，相同属性但类型不同之间的拷贝，以ObjectMapper为例
     *
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        Person person = new Person("John", "25");

        ObjectMapper objectMapper = new ObjectMapper();
        //设置禁用策略：禁用后，如果序列化的Java对象为空，则ObjectMapper将不会抛出异常，而是返回空JSON对象。
        objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);

        //将一个对象转换为JSON格式的字符串
        String jsonString = objectMapper.writeValueAsString(person);
        //将JSON格式的字符串转换为目标类型的对象
        Employee targetObject = objectMapper.readValue(jsonString, Employee.class);

        System.out.println(person);
        System.out.println(targetObject);
    }

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    private static class Person {
        private String name;
        private String age;
    }


    @Data
    private static class Employee {
        private String name;
        private int age;
    }
}