//: 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();
}
}
} ///:~ |