Writing arraylist to textfile

Question

I have an arraylist of class Room which is held in class Hostel, i would like to write this arraylist to a text file. What is the most efficient method of doing so?

Hostel Class

public class Hostel
{
    private ArrayList < Room > rooms;
}

Room Class

abstract class Room
{

public Room(int newRoomNo, boolean newRoomEnSuite, int newRoomNights, String        newRoomBooker)
    {
        roomNo = newRoomNo;
        roomEnSuite = newRoomEnSuite;
        roomBooking = "Booked";
        roomNights = newRoomNights;
        roomBooker = newRoomBooker;
    }
}

Answer 1

A one-liner from commons-io

FileUtils.writeLines(new File(path), list);