对于Java，我可以一次导入所有包吗？ [英] For Java, can I import all packages at once?

问题描述

例如，第三方库对包使用非常复杂的目录结构。
我可以一次导入它们吗？明星似乎只能导入一个目录级别。

For example, the third party library uses very complex directory structure for the package. Can I import them at once. the star seems can only imports one directory level.

推荐答案

假设您在询问是否可以执行以下操作：

Assuming you're asking whether or not you can do something like:

import com.example.*;
// expecting packages like com.example.foo.* and com.example.bar.* to be imported

然后答案是否。你可以做的最广泛的导入就是一个带星星的包。

Then the answer is no. The widest import you can make is a single package with a star.

JLS（7.5节）定义导入语句的结构。

The JLS (section 7.5) defines the structure for import statements.

此外，它将是编译器一次导入一堆包有问题。如果两个包提供相同的类型，两者都被导入，并且类在类中使用，则会发生编译时错误。这在 JLS 6.5.5.1 中有所描述：

Additionally, it would be problematic for the compiler to import a bunch of packages at once. If two packages provide the same type, both are imported, and the type is used in the class, a compile-time error occurs. This is described in JLS 6.5.5.1:

否则，如果该名称的类型是
，则由多于一个
类型 - 按需导入声明声明
编译单元，然后名称是
不明确的类型名称;发生
编译时错误。

Otherwise, if a type of that name is declared by more than one type-import-on-demand declaration of the compilation unit, then the name is ambiguous as a type name; a compile-time error occurs.

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