File mark() reset() doubt...

Question

Hi,
I have a doubt regarding the concept of reset() and mark() methods of BufferedInputStream class. Here is the code
class FileDemo
  public static void main(String[] args)throws IOException
          String st = "123456789";
          int c;
          byte[] buf = st.getBytes();
          ByteArrayInputStream in = new ByteArrayInputStream(buf);
          BufferedInputStream f = new BufferedInputStream(in);
          for(int i=0;i<8;++i)
          c = f.read();
          System.out.print((char)c);
          System.out.println();     
          f.mark(5);
          f.reset();
          c = f.read();
          System.out.print((char)c);
Output
12345678
9In above code when i execute f.mark(5), the file pointer should make a mark at 5th byte i.e character 5, and when i execute reset the file pointer must point back to this 5th byte and must print 5 when i print for the next time. But instead the output i get is 9 after reset is executed. Please clarify.....

Answer 1

In above code when i execute f.mark(5), the file
pointer should make a mark at 5th byte i.e character 5No, it shouldn't.
and when i execute reset the file pointer must
point back to this 5th byte and must print 5 when i
print for the next time. But instead the output i get
is 9 after reset is executed. Please clarify.....The API documentation is pretty clear, I think, especially if you follow the links to the description of what mark() is supposed to do:
"Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.
The readlimit argument tells this input stream to allow that many bytes to be read before the mark position gets invalidated."