SUMMARY i / o stream
Flow: We have a normal life, water, currents, traffic and so on.
The program stream i / o channel is a program stream, this channel may be used to program a sequence of bytes to the file, memory, display and the like.
i / o stream: input and output stream
1. input stream, file, network, compressed, other data sources like occurs to a program through the data stream
2. The output stream, the program needs to output the data, and transmits the data stream to a file, a network, or other target compressed
