如果一个applet捆绑到一个JAR文件中，那么浏览器就可以在一个HTTP事务中下载这个applet的类文件和相关的资源，而不是对每一个文件打开一个新连接。

If an applet is bundled in a JAR file, the applet's class files and associated resources can be downloaded by a browser in a single HTTP transaction, instead of opening a new connection for each file.

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