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Java Source | 2000-05-25 | 4.4 KB | 125 lines |
- //: Compete.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.*;
-
- class Thing1 implements Serializable {}
- class Thing2 implements Serializable {
- Thing1 o1 = new Thing1();
- }
-
- class Thing3 implements Cloneable {
- public Object clone() {
- Object o = null;
- try {
- o = super.clone();
- } catch (CloneNotSupportedException e) {
- System.out.println("Thing3 can't clone");
- }
- return o;
- }
- }
-
- class Thing4 implements Cloneable {
- Thing3 o3 = new Thing3();
- public Object clone() {
- Thing4 o = null;
- try {
- o = (Thing4)super.clone();
- } catch (CloneNotSupportedException e) {
- System.out.println("Thing4 can't clone");
- }
- // Clone the field, too:
- o.o3 = (Thing3)o3.clone();
- return o;
- }
- }
-
- public class Compete {
- static final int SIZE = 5000;
- public static void main(String[] args) {
- Thing2[] a = new Thing2[SIZE];
- for(int i = 0; i < a.length; i++)
- a[i] = new Thing2();
- Thing4[] b = new Thing4[SIZE];
- for(int i = 0; i < b.length; i++)
- b[i] = new Thing4();
- try {
- long t1 = System.currentTimeMillis();
- ByteArrayOutputStream buf =
- new ByteArrayOutputStream();
- ObjectOutputStream o =
- new ObjectOutputStream(buf);
- for(int i = 0; i < a.length; i++)
- o.writeObject(a[i]);
- // Now get copies:
- ObjectInputStream in =
- new ObjectInputStream(
- new ByteArrayInputStream(
- buf.toByteArray()));
- Thing2[] c = new Thing2[SIZE];
- for(int i = 0; i < c.length; i++)
- c[i] = (Thing2)in.readObject();
- long t2 = System.currentTimeMillis();
- System.out.println(
- "Duplication via serialization: " +
- (t2 - t1) + " Milliseconds");
- // Now try cloning:
- t1 = System.currentTimeMillis();
- Thing4[] d = new Thing4[SIZE];
- for(int i = 0; i < d.length; i++)
- d[i] = (Thing4)b[i].clone();
- t2 = System.currentTimeMillis();
- System.out.println(
- "Duplication via cloning: " +
- (t2 - t1) + " Milliseconds");
- } catch(Exception e) {
- e.printStackTrace();
- }
- }
- } ///:~