Java包导入别名 [英] Java Package Import Alias
问题描述
在Java中是否可以导入包并为此包导入一个特定的名称?
Is it possible in Java to import packages and give this package import a specific name?
我目前有一个类,它使用来自后端的一些DTO和服务包。在这两个包中,DTO都有相同的名称。我认为这不太可读:
I currently have a class, which uses some DTO's from a backend and a service package. In both packages the DTO's have the same name. And I think this isn't quite readable:
com.backend.mypackage.a.b.c.d.UserDto userBackend = new com.backend.mypackage.a.b.c.d.UserDto();
com.service.mypackage.a.b.c.d.UserDto userService = new com.service.mypackage.a.b.c.d.UserDto();
mapper(userBackend, userService);
这是一个小例子。该类实际上非常复杂,并且其中包含更多代码。
This is a small example. The class is actually quite complex and has a lot more code in it.
Java是否有像这样的东西将com.backend.mypackage.abcdUserDto导入为userDtoBackend
所以我可以缩短我的来源代码?
Does Java have something like import com.backend.mypackage.a.b.c.d.UserDto as userDtoBackend
so i can shorten my source code?
推荐答案
不,你不能做导入x为y;在Java中。
No, you can not do "import x as y;" in Java.
你可以做的是扩展类,或者为它编写一个包装类,然后导入它。
What you CAN do is to extend the class, or write a wrapper class for it, and import that one instead.
import com.backend.mypackage.a.b.c.UserDto;
public class ImportAlias {
static class UserDtoAlias extends com.backend.mypackage.a.b.c.d.UserDto {
}
public static void main(String[] args) {
UserDto userBackend = new UserDto();
UserDtoAlias userService = new UserDtoAlias();
mapper(userBackend, userService);
}
private static void mapper(UserDto userBackend, UserDtoAlias userService) {
// ...
}
}
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