In order to be able to load the classes inside a jar file inside a jar file (the crucial issue, as you'll recall), I first had to be able to open and read the top-level jar file (main.jar above).

为了能够装入在jar文件内部的jar文件中的类(这是关键问题，您可以回想起来)，我首先必须能够打开并读取顶层的jar文件(上面的main . jar文件)。

youdao