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import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class Demo3_Copy {
public static void main(String[] args) throws IOException {
FileReader fr=new FileReader("xxx.txt");
FileWriter fw=new FileWriter("zzz.txt");
int b;
while((b=fr.read())!=-1){
fw.write(b);
}
fr.close();
fw.close();//write类中有一个2k的小缓冲区,如果不关流,就会将内容写到缓冲区里,关流会将缓存区内容刷新出来在关闭
}
}