传递参数的泛型方法- java.lang.ClassCastException: com.google.gson.internal.LinkedTreeMap

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

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

        Gson gson = new Gson();
        TypeToken<Person> typeToken = new TypeToken<Person>() {};
        Person person = gson.fromJson(json, typeToken.getType());

        System.out.println(person.getName());
        System.out.println(person.getAge());
    }

    static class Person {
        private String name;
        private int age;

        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;
        }
    }
}