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staticvoidmain，其是作为应用程序的入口点。
In here is our static void main call, which serves an entry point for the application.
在这里调用的是staticvoidmain，其是作为应用程序的入口点。
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