Java tutorial
import java.io.*; public class Main { public static void main(String[] args) { try { int i = 70; RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw"); raf.writeChar(i); raf.seek(0); System.out.println(raf.readChar()); raf.seek(0); raf.writeChar(71); raf.seek(0); System.out.println(raf.readChar()); raf.close(); } catch (IOException ex) { ex.printStackTrace(); } } }