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MyWorld.java
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// serialization/MyWorld.java
// (c)2021 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@19e0bfd], House@139a55
, Ralph the hamster[Animal@1db9742], House@139a55
, Molly the cat[Animal@106d69c], House@139a55
]
animals1: [Bosco the dog[Animal@1ee12a7], House@10bedb4
, Ralph the hamster[Animal@103dbd3], House@10bedb4
, Molly the cat[Animal@167cf4d], House@10bedb4
]
animals2: [Bosco the dog[Animal@1ee12a7], House@10bedb4
, Ralph the hamster[Animal@103dbd3], House@10bedb4
, Molly the cat[Animal@167cf4d], House@10bedb4
]
animals3: [Bosco the dog[Animal@a987ac], House@a3a380
, Ralph the hamster[Animal@1453f44], House@a3a380
, Molly the cat[Animal@ad8086], House@a3a380
]
*/