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Java Source | 2000-05-25 | 4.2 KB | 111 lines |
- //: MyWorld.java
- //////////////////////////////////////////////////
- // Copyright (c) Bruce Eckel, 1998
- // Source code file from the book "Thinking in Java"
- // All rights reserved EXCEPT as allowed by the
- // following statements: You can freely use this file
- // for your own work (personal or commercial),
- // including modifications and distribution in
- // executable form only. Permission is granted to use
- // this file in classroom situations, including its
- // use in presentation materials, as long as the book
- // "Thinking in Java" is cited as the source.
- // Except in classroom situations, you cannot copy
- // and distribute this code; instead, the sole
- // distribution point is http://www.BruceEckel.com
- // (and official mirror sites) where it is
- // freely available. You cannot remove this
- // copyright and notice. You cannot distribute
- // modified versions of the source code in this
- // package. You cannot use this file in printed
- // media without the express permission of the
- // author. Bruce Eckel makes no representation about
- // the suitability of this software for any purpose.
- // It is provided "as is" without express or implied
- // warranty of any kind, including any implied
- // warranty of merchantability, fitness for a
- // particular purpose or non-infringement. The entire
- // risk as to the quality and performance of the
- // software is with you. Bruce Eckel and the
- // publisher shall not be liable for any damages
- // suffered by you or any third party as a result of
- // using or distributing software. In no event will
- // Bruce Eckel or the publisher be liable for any
- // lost revenue, profit, or data, or for direct,
- // indirect, special, consequential, incidental, or
- // punitive damages, however caused and regardless of
- // the theory of liability, arising out of the use of
- // or inability to use software, even if Bruce Eckel
- // and the publisher have been advised of the
- // possibility of such damages. Should the software
- // prove defective, you assume the cost of all
- // necessary servicing, repair, or correction. If you
- // think you've found an error, please email all
- // modified files with clearly commented changes to:
- // Bruce@EckelObjects.com. (Please use the same
- // address for non-code errors found in the book.)
- /////////////////////////////////////////////////
-
- import java.io.*;
- import java.util.*;
-
- class House implements Serializable {}
-
- class Animal implements Serializable {
- String name;
- House preferredHouse;
- Animal(String nm, House h) {
- name = nm;
- preferredHouse = h;
- }
- public String toString() {
- return name + "[" + super.toString() +
- "], " + preferredHouse + "\n";
- }
- }
-
- public class MyWorld {
- public static void main(String[] args) {
- House house = new House();
- Vector animals = new Vector();
- animals.addElement(
- new Animal("Bosco the dog", house));
- animals.addElement(
- new Animal("Ralph the hamster", house));
- animals.addElement(
- new Animal("Fronk 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:
- ByteArrayOutputStream buf2 =
- new ByteArrayOutputStream();
- ObjectOutputStream o2 =
- new ObjectOutputStream(buf2);
- o2.writeObject(animals);
- // Now get them back:
- ObjectInputStream in1 =
- new ObjectInputStream(
- new ByteArrayInputStream(
- buf1.toByteArray()));
- ObjectInputStream in2 =
- new ObjectInputStream(
- new ByteArrayInputStream(
- buf2.toByteArray()));
- Vector animals1 = (Vector)in1.readObject();
- Vector animals2 = (Vector)in1.readObject();
- Vector animals3 = (Vector)in2.readObject();
- System.out.println("animals1: " + animals1);
- System.out.println("animals2: " + animals2);
- System.out.println("animals3: " + animals3);
- } catch(Exception e) {
- e.printStackTrace();
- }
- }
- } ///:~