After all the args prefixed with a "-" are processed, check if there are any remaining args.
处理完所有以“-”为前缀的参数后，应检查是否还有剩余的参数。
If the class has a no-args constructor, and you want to use that constructor and then immediately invoke a single instance method on it, there's a shortcut.
如果该类具有一个无参构造函数，您想使用这个构造函数，然后立即在其上调用一个实例方法，那么有一种捷径。
If there are less than three args, we print a message and exit.
如果少于三个参数，则打印消息并退出。
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