如何在不同的包中导入两个具有相同名称的类？ [英] How to import two classes with the same name in different packages?

问题描述

我想导入这两个类，名为 Query - 一个是 JDO 类，另一个是 JPA class，在同一个类中使用不同的方法。

  import javax.jdo.Query; 
 import javax.persistence.Query; 
  

有没有办法在文件顶部同时全局导入它们？

解决方案

我害怕，不。但是您不必导入类来使用它：只需按其全名引用其中一个类，例如

  javax .jdo.Query query = getJDOQuery（）; 
 query.doSomething（）; 
  

然后你可以导入另一个没有名字冲突。

顺便说一句，有时候如果你开始在你的班级中得到很多这样的名字这样的碰撞，那就是重构的一个微妙的暗示：将一个大类的功能分成几个小类。

I want to import these two classes, both named Query - one a JDO class, the other a JPA class, to use in different methods in the same class.

import javax.jdo.Query;
import javax.persistence.Query;

Is there a way to globally import both of them at the same time at the top of the file?

解决方案

I'm afraid, no. But you don't have to import class to use it: just reference one of the classes by its full name, like

javax.jdo.Query query = getJDOQuery();
query.doSomething();

Then you can import another without name collisions.

BTW, sometimes if you start getting lots of such name such collisions in your class, it's a subtle hint for refactoring: splitting functionality of one big class between several small ones.

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