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????Java?????????????????????????????????????????????????????????????????????????????????InputStream?OutputStream???????????????????
InputStream?Java?????????????????????????IOException???InputStream??????????????????????????????????????read()?read(byte[])?read(byte[],int,int)??
OutputStream???????????????????void????????IOException?OutputStream??????????????????????????????write(int)?write(byte[])?write(byte[],int,int)??
FileInputStream?FileOutputStream????????????????????????FileInputStream?????????????????File???FileOutputStream?????????????????????????????????
ByteArrayInputStream?ByteArrayOutputStream???????????????ByteArrayInputStream????????????????????????????ByteArrayOutputStream????????????????????????
??????FilterInputStream?FilterOutputStream???????????????????????????????????BufferedInputStream?BufferedOutputStream??????????????????????
PushbackInputStream????????????????????????????????SequenceInputStream?????????????????????????????
PrintStream?????System.out???????????????????????toString???RandomAccessFile??????????????????????????????????????????????setLength??????????
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