Master/Reference Architectures and Patterns/hjp5/examples/Listing2002.java


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/* Listing2002.java */

import java.io.*;

public class Listing2002
{
  public static void main(String[] args)
  {
    try {
      RandomAccessFile f1 = new RandomAccessFile(
        args[0], "rw"
      );
      long len = f1.length();
      f1.setLength(2 * len);
      for (long i = 0; i < len; ++i) {
        f1.seek(i);
        int c = f1.read();
        f1.seek(2 * len - i - 1);
        f1.write(c);
      }
      f1.close();
    } catch (IOException e) {
      System.err.println(e.toString());
    }
  }
}