除了不会阻塞之外，非阻塞读不能给呼叫方任何保证。

A nonblocking read makes no guarantee to the caller besides the fact that it won't block.

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为了实现基础的非阻塞套接字读和写操作，我们要处理两个新类。

We have two new classes to deal with in order to implement basic nonblocking socket read and write operations. These are the InetSocketAddress class from the java.net.

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