// serialization/MyWorld.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.io.*;
import java.util.*;

class House implements Serializable {}

class Animal implements Serializable {
 private String name;
 private House preferredHouse;
 Animal(String nm, House h) {
 name = nm;
 preferredHouse = h;
 }
 @Override
 public String toString() {
 return name + "[" + super.toString() +
 "], " + preferredHouse + "\n";
 }
}

public class MyWorld {
 public static void main(String[] args) {
 House house = new House();
 List<Animal> animals = new ArrayList<>();
 animals.add(
 new Animal("Bosco the dog", house));
 animals.add(
 new Animal("Ralph the hamster", house));
 animals.add(
 new Animal("Molly the cat", house));
 System.out.println("animals: " + animals);
 try(
 ByteArrayOutputStream buf1 =
 new ByteArrayOutputStream();
 ObjectOutputStream o1 =
 new ObjectOutputStream(buf1)
 ) {
 o1.writeObject(animals);
 o1.writeObject(animals); // Write a 2nd set
 // Write to a different stream:
 try(
 ByteArrayOutputStream buf2 =
 new ByteArrayOutputStream();
 ObjectOutputStream o2 =
 new ObjectOutputStream(buf2)
 ) {
 o2.writeObject(animals);
 // Now get them back:
 try(
 ObjectInputStream in1 =
 new ObjectInputStream(
 new ByteArrayInputStream(
 buf1.toByteArray()));
 ObjectInputStream in2 =
 new ObjectInputStream(
 new ByteArrayInputStream(
 buf2.toByteArray()))
 ) {
 List
 animals1 = (List)in1.readObject(),
 animals2 = (List)in1.readObject(),
 animals3 = (List)in2.readObject();
 System.out.println(
 "animals1: " + animals1);
 System.out.println(
 "animals2: " + animals2);
 System.out.println(
 "animals3: " + animals3);
 }
 }
 } catch(IOException | ClassNotFoundException e) {
 throw new RuntimeException(e);
 }
 }
}
/* Output:
animals: [Bosco the dog[Animal@15db9742],
House@6d06d69c
, Ralph the hamster[Animal@7852e922], House@6d06d69c
, Molly the cat[Animal@4e25154f], House@6d06d69c
]
animals1: [Bosco the dog[Animal@7ba4f24f],
House@3b9a45b3
, Ralph the hamster[Animal@7699a589], House@3b9a45b3
, Molly the cat[Animal@58372a00], House@3b9a45b3
]
animals2: [Bosco the dog[Animal@7ba4f24f],
House@3b9a45b3
, Ralph the hamster[Animal@7699a589], House@3b9a45b3
, Molly the cat[Animal@58372a00], House@3b9a45b3
]
animals3: [Bosco the dog[Animal@4dd8dc3],
House@6d03e736
, Ralph the hamster[Animal@568db2f2], House@6d03e736
, Molly the cat[Animal@378bf509], House@6d03e736
]
*/