Flow overview ：
stay java in , Different input and output sources are operated in the form of streams ( input , output ), Flow is an abstract description , A transfer method of representing data in a program
Jdk Different streams are provided to handle different input and output sources , According to the flow properties, it can be divided into the following types :
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By flow direction （ From the perspective of procedure ）
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Input stream (input)
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Output stream (output)
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By type :
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Byte stream (InputStream/OutputStream)
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Any file can be transferred through a byte stream .
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Character stream (Reader/Writer)
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Non plain text file , Cannot use character stream , Can cause file format corruption , Can't execute normally .
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Node flow ( Low level flow : Direct docking with input and output sources )
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FileInputStream/FileOutputStream/FileReader/FileWriter/PrintStream/PrintWriter.
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Process flow ( Advanced flow : Based on low-level flow )
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Conversion flow ：InputStreamReader/OutputStreamWriter, Byte flow character stream / Character flow byte stream
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Buffer stream ：BufferedInputStream/BufferedOutputStream
BufferedReader/BufferedReader Nodes can be wrapped in rows , Make reading and writing faster
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