如果父类返回null(或抛出ClassNotFoundException)，那么类装入器会在自己的路径中寻找类的源。
If the parent returns null (or throws a ClassNotFoundException), then the class loader searches its own path for the source of the class.
编译器只知道如何搜索其包括路径寻找你指定的标头，并探讨。
The compiler only knows how to search its include path to try to find the headers you specify, and examines those.
这通常是前往伺服器档案系统上要寻找的资讯的路径，不过它也可以指出伺服器必须执行才能提供资讯的应用程式或指令码。
Typically this is the path to the desired information on the server's file system, although it also can indicate the application or script the server must run to provide the information.
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