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            void close£¨£© throws IOException ¹Ø±ÕÁ÷ÊÍ·ÅÄÚ´æ×ÊÔ´
             long skip£¨long n£© throws IOException Ìø¹ýn¸ö×Ö½Ú²»¶Á
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            void write£¨int b£© throws IOException ÏòÊä³öÁ÷дÈëÒ»¸ö×Ö½ÚÊý¾Ý
             void flush£¨£© throws IOException ½«Êä³öÁ÷Öлº³åµÄÊý¾ÝÈ«²¿Ð´³öµ½Ä¿µÄµØ
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           void write£¨String str£© throws IOException½«Ò»¸ö×Ö·û´®ÖеÄ×Ö·ûдÈëµ½Êä³öÁ÷
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.io.BufferedReader;   
import
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.io.FileInputStream;   
import
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.io.FileNotFoundException;   
import
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.io.FileOutputStream;   
import
 java
.io.IOException;   
import
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