Attempts to read characters into the specified character buffer. The buffer is used as a repository of characters as-is: the only changes made are the results of a put operation. No flipping or rewinding of the buffer is performed.

cb	the buffer to read characters into
return
Throws	IOException: if an I/O error occurs
Throws	NullPointerException: if cb is null
Throws	ReadOnlyBufferException: if cb is a read only buffer