101 lines
2.8 KiB
Java
101 lines
2.8 KiB
Java
// serialization/MyWorld.java
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// (c)2020 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.io.*;
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import java.util.*;
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class House implements Serializable {}
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class Animal implements Serializable {
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private String name;
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private House preferredHouse;
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Animal(String nm, House h) {
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name = nm;
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preferredHouse = h;
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}
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@Override
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public String toString() {
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return name + "[" + super.toString() +
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"], " + preferredHouse + "\n";
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}
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}
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public class MyWorld {
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public static void main(String[] args) {
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House house = new House();
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List<Animal> animals = new ArrayList<>();
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animals.add(
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new Animal("Bosco the dog", house));
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animals.add(
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new Animal("Ralph the hamster", house));
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animals.add(
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new Animal("Molly the cat", house));
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System.out.println("animals: " + animals);
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try(
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ByteArrayOutputStream buf1 =
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new ByteArrayOutputStream();
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ObjectOutputStream o1 =
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new ObjectOutputStream(buf1)
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) {
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o1.writeObject(animals);
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o1.writeObject(animals); // Write a 2nd set
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// Write to a different stream:
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try(
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ByteArrayOutputStream buf2 =
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new ByteArrayOutputStream();
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ObjectOutputStream o2 =
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new ObjectOutputStream(buf2)
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) {
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o2.writeObject(animals);
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// Now get them back:
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try(
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ObjectInputStream in1 =
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new ObjectInputStream(
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new ByteArrayInputStream(
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buf1.toByteArray()));
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ObjectInputStream in2 =
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new ObjectInputStream(
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new ByteArrayInputStream(
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buf2.toByteArray()))
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) {
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List
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animals1 = (List)in1.readObject(),
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animals2 = (List)in1.readObject(),
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animals3 = (List)in2.readObject();
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System.out.println(
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"animals1: " + animals1);
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System.out.println(
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"animals2: " + animals2);
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System.out.println(
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"animals3: " + animals3);
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}
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}
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} catch(IOException | ClassNotFoundException e) {
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throw new RuntimeException(e);
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}
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}
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}
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/* Output:
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animals: [Bosco the dog[Animal@15db9742],
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House@6d06d69c
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, Ralph the hamster[Animal@7852e922], House@6d06d69c
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, Molly the cat[Animal@4e25154f], House@6d06d69c
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]
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animals1: [Bosco the dog[Animal@7ba4f24f],
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House@3b9a45b3
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, Ralph the hamster[Animal@7699a589], House@3b9a45b3
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, Molly the cat[Animal@58372a00], House@3b9a45b3
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]
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animals2: [Bosco the dog[Animal@7ba4f24f],
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House@3b9a45b3
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, Ralph the hamster[Animal@7699a589], House@3b9a45b3
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, Molly the cat[Animal@58372a00], House@3b9a45b3
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]
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animals3: [Bosco the dog[Animal@4dd8dc3],
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House@6d03e736
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, Ralph the hamster[Animal@568db2f2], House@6d03e736
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, Molly the cat[Animal@378bf509], House@6d03e736
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]
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*/
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