public class RandomAccessFileTest {

    public static void main(String[] args) {

        try {

            RandomAccessFile file= new RandomAccessFile("c://temp//in.txt","rw");

            System.out.println(file.readLine());

            file.seek(file.length());

            //clear all

//            file.setLength(0l);

            //use write() to replace writeBytes

            file.write("hello ross test".getBytes());

            //writeBytes will has issue on UTF8

//            file.writeBytes("");

            file.close();

        } catch (FileNotFoundException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (IOException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

}