import java.io.*;
import java.util.*;

class Data implements Serializable {
	int n;
	Data next;
	
	public Data(int n) {
		this.n = n;
	}
}

public class SerialList {
	public static void main(String[] args) throws ClassNotFoundException, IOException {
		List<Data> l1 = new ArrayList<>(Arrays.asList(new Data(1), new Data(2)));
	      
		ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("d.out"));
		out.writeObject(l1);
		out.close();
		
		ObjectInputStream in = new ObjectInputStream(new FileInputStream("d.out"));
		List<Data> l2 = (List<Data>)in.readObject();
		in.close();
		
		for (Data e : l2)
			System.out.println(e.n);
	}
}