New io how to implement asynchronous ?

  FileChannel fc =  new FileOutputStream().getChannel();
  fc.read( buff);
  

The above two lines of code , if there are multiple FileChannel to read , how to achieve asynchronous read ? If FileChannel not achieve asynchronous , it is better to use the old io Well, just more than a thread-safe .
socket stream can be asynchronous , other streams InputStream how to implement asynchronous ?
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file stream asynchronous read , in addition to their own trouble, does not seem ( under normal circumstances ) what the real meaning.
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file stream without an asynchronous read is not a problem. I mean, what use FileChannel.
Then nonblocking socket stream in the end just be able to traverse , or every time the channel is asynchronous read and write .
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answer is not asynchronous , asynchronous only asy ... channel
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local file , then it is.