在Java中将类(“Country.class”)作为参数传递 [英] Passing a class ("Country.class") as an argument in Java

查看:1858
本文介绍了在Java中将类(“Country.class”)作为参数传递的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我试图创建一个接受 Country.class User.class 等参数的方法,并返回 argument.count()

I'm trying to make a method that takes an argument of Country.class, User.class etc, and returns argument.count().

Model 并使用方法 count()

我的代码:

private static long <T> countModel(Model<T> clazz)
{
    // there is other important stuff here, which prevents me from
    // simply by-passing the method altogether.

    return clazz.count();
}

Called by:
$ b

Called by:

renderArgs.put("countryCount", countModel(Country.class));

但是这根本不起作用。

我该如何做?

推荐答案

我想你想做

private long countModel(Class<? extends Model> clazz) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException
{
  Method countMethod =  clazz.getDeclaredMethod("count", null);
  return (Long) countMethod.invoke(null, null);
}

希望这样的东西能工作(我的反射技能不是很好) 。

Hopefully something like this would work (my reflection skills are not really that good).

这篇关于在Java中将类(“Country.class”)作为参数传递的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆