Every method of the main interface has a matching entry in the asynchronous interface, but with a return type of void and an additional argument of class AsyncCallback.
主接口的每种方法在异步接口中都有相匹配的条目，但是附带了void返回类型和asynccallback类的附加参数。
In here is our static void main call, which serves an entry point for the application.
在这里调用的是static void main，其是作为应用程序的入口点。
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