当您需要一个文件(或目录)别名时，您使用链接，目的可能是提供一个更方便、简短的路径。
You use links when you need an alias for a file (or directory), possibly to provide a more convenient or shorter path.
要更新许多项目的类路径，右键单击plugin . xml文件或Package Explorer中的一组项目，并选择update classpath。
To update the classpaths of a number of projects, right-click on a plugin.xml file or set of projects in the Package Explorer and select update classpath.
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