public class World {

	public World() { }

	public class Person implements Serializable {
		private static final long serialVersionUID = 1L;
		private String name;
		public Person() { }
		public String toString() {
			return "{" + name + "}";
		}
	}

	private Person person = new Person();

	synchronized public void save() {
		try {
			FileOutputStream fos = new FileOutputStream("save.ser");
			BufferedOutputStream bos = new BufferedOutputStream(fos);
			ObjectOutputStream oos = new ObjectOutputStream(bos);
			oos.writeObject(person);
			oos.close();
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
	}
}