Java导入混乱 [英] Java import confusion

问题描述

有什么区别：

java.awt.*;

和：

java.awt.event.*;

我在许多程序中都找到了。

I find both in many programs.

推荐答案

Java中的包不是嵌套的。

Packages in Java are not nested.

当你 import java.awt。* ，您只导入包中的所有类和接口 java.awt - 您不导入 java.awt 下的所有软件包，例如 java.awt.event 。

When you import java.awt.*, you are only importing all the classes and interfaces that are in the package java.awt - you are not importing all the packages that are under java.awt, such as java.awt.event.

即使它看起来像是嵌套的（例如，它看起来好像是 java.awt.event 是 java.awt 的子包，实际情况并非如此。您应该将 java.awt 和 java.awt.event 视为两个碰巧有共同点的不相关的包部分名字。

Even though it looks like packages are nested (i.e., it looks like as if java.awt.event is a "subpackage" of java.awt), this is not really the case. You should regard java.awt and java.awt.event as two different, unrelated packages that happen to have a common part in their names.

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