Before running your application, log into AIM using your personal screen name and add your application's screen name as a buddy.

在运行应用程序之前，使用个人屏幕名登录到AIM中，并将应用程序的屏幕名加为好友。

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Step through a few lines of execution, and watch s change from null to the buddy note for your user ID (if you did not add one as requested earlier, then s will not change).

执行几行代码，将观察到 s 值由 null 变为用户 ID 的 buddy 注释（如果没有像前面要求的那样添加注释，则变量 s 的值不会发生变化）。

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