Use RandomAccessFile to reverse a file : RandomAccessFile « File « Java Tutorial

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Java Tutorial » File » RandomAccessFile

11. 40. 7. Use RandomAccessFile to reverse a file


import java.io.RandomAccessFile;



public class Main {

  public static void main(String[] argv) throws Exception {



    RandomAccessFile raf = new RandomAccessFile("a.dat", "rw");

    int x, y;



    for (long i = 0, j = raf.length() - 1; i < j; i++, j--) {

      raf.seek(i);

      x = raf.read();

      raf.seek(j);

      y = raf.read();



      raf.seek(j);

      raf.write(x);

      raf.seek(i);

      raf.write(y);



    }

    raf.close();

  }

}

11. 40. RandomAccessFile
	11. 40. 1.	RandomAccessFile Introduction
	11. 40. 2.	Employs RandomAccessFile to store ints and changes the value of the third int.
	11. 40. 3.	Seek in RandomAccessFile
	11. 40. 4.	Getting FileChannel from RandomAccessFile
	11. 40. 5.	Write int to RandomAccessFile using FileChannel
	11. 40. 6.	Use RandomAccessFile to save and read
	11. 40. 7.	Use RandomAccessFile to reverse a file
	11. 40. 8.	Test file pointer manipulation between FileChannel and RandomAccessFile objects.
	11. 40. 9.	Appending data to existing file

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