??Java???????????
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????1??BufferedReader??Reader??????????????л??????????????????????????豸?ж???????????????????????????
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????2??InputStreamReader??InputStream??Reader??????????????System.in??????????????????????????????????? BufferedReader??á?
????3??PrintWriter out1 = new PrintWriter??new BufferedWriter??new FileWriter??"IODemo.out"????????
??????仰??????Java???????????????????????????????????ü????????????????????IODemo.out???????????????FileWriter????????????????????????????????????????????????????BufferedWriter?????????????????????????????????????????PrintWriter???????
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??????????java.lang.System??????????
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