import java.io.RandomAccessFile;
import java.io.FileNotFoundException;
import java.io.IOException;

public class RandomAccessFileDemo {
	public static void main(String[] args) {
		try {
			//Open the file for writing and reading.
			RandomAccessFile f =
				new RandomAccessFile("rand.txt", "rw");

			f.writeBytes("Hello");
			System.out.println("pointer == " + f.getFilePointer());
			f.seek(0);
			System.out.println("pointer == " + f.getFilePointer());

			byte[] a = new byte[5];
			f.read(a);
			System.out.println(new String(a));
			f.close();
		}

		catch (FileNotFoundException e) {
			//file can't be created or opened
			System.err.println(e.getMessage());
		}

		catch (IOException e) {
			System.err.println(e.getMessage());
		}
	}
}