The interface to read from a channel is called ChannelInput and consists of a single method called read .

从通道读取对象的接口叫作ChannelInput，它只有一个方法，叫作read 。

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A process that calls this method on an object implementing the ChannelInput interface will block until an object is actually written on the channel by a process at the other end of the channel.

如果进程调用一个实现ChannelInput接口的对象的这个方法，那么进程会阻塞，直到在通道另一端的进程实际向通道写入了一个对象。

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