Bytes stream or character stream or buffer character stream

Stream ends with a byte stream, and reader and writer end up with a character stream
The difference between the two is read and write, one is read by Byte, and the other is by character. Operation Byte
Reading and writing a file requires that the content be processed in rows, such as comparing specific characters, and a character stream is typically selected when processing a row of data. Manipulating Char
Just read and write files, and the contents of the file independent, the general choice of byte stream.
BufferedReader and BufferedReader    line-by-line character reads, manipulating string

Bytes stream or character stream or buffer character stream