protected <T extends Model> List<T> PostData(String serviceName, SearchInfo info)
            throws ApiException {
//其中builder是一个Json字符串
Type t = new TypeToken<List<T>>() {
            }.getType();

            // Create a new Model from the JSON data.
            List<T> list = new Gson().fromJson(
                    builder, t);
}

  调用方法是这样调用的this.<AccessStatistics>PostData("test",info)
//其中AccessStatistics是Model的一个子类，info是SearchInfo的实例化对象

package test;

import java.util.ArrayList;
import java.util.List;

public class Node extends IModel{
    
    public static void main(String[] args) throws InstantiationException, IllegalAccessException {
        System.out.println(new Node().<Node>test(Node.class));
    }
    
    public <T extends IModel> List<T> test(Class<T> clazz) throws InstantiationException, IllegalAccessException{
        List<T> list= new ArrayList<T>();
        T obj = clazz.newInstance();
        list.add(obj);
        System.out.println(list.get(0).getClass());
        return list;
    }
    
}

class IModel{
    
}

------解决方案--------------------
List<T> list = new Gson().<AccessStatistics>fromJson(builder.toString(), t);


------解决方案--------------------
错了，第2个参数就是类型了，
你可以换成这个试试
fromJson(JsonElement json, Class<T> classOfT)