// references/Compete.java

// (c)2017 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 onjava.Timer;

class Thing1 implements Serializable {}

class Thing2 implements Serializable {

Thing1 t1 = new Thing1();

}

class Thing3 implements Cloneable {

@Override

public Thing3 clone() {

try {

return (Thing3)super.clone();

} catch(CloneNotSupportedException e) {

throw new RuntimeException(e);

}

}

}

class Thing4 implements Cloneable {

private Thing3 t3 = new Thing3();

@Override

public Thing4 clone() {

Thing4 t4 = null;

try {

t4 = (Thing4)super.clone();

} catch(CloneNotSupportedException e) {

throw new RuntimeException(e);

}

// Clone the field, too:

t4.t3 = t3.clone();

return t4;

}

}

public class Compete {

public static final int SIZE = 100000;

public static void

main(String[] args) throws Exception {

Thing2[] a = new Thing2[SIZE];

for(int i = 0; i < SIZE; i++)

a[i] = new Thing2();

Thing4[] b = new Thing4[SIZE];

for(int i = 0; i < SIZE; i++)

b[i] = new Thing4();

Timer timer = new Timer();

try(

ByteArrayOutputStream buf =

new ByteArrayOutputStream();

ObjectOutputStream oos =

new ObjectOutputStream(buf)

) {

for(Thing2 a1 : a) {

oos.writeObject(a1);

}

// Now get copies:

try(

ObjectInputStream in =

new ObjectInputStream(

new ByteArrayInputStream(

buf.toByteArray()))

) {

Thing2[] c = new Thing2[SIZE];

for(int i = 0; i < SIZE; i++)

c[i] = (Thing2)in.readObject();

}

}

System.out.println(

"Duplication via serialization: " +

timer.duration() + " Milliseconds");

// Now try cloning:

timer = new Timer();

Thing4[] d = new Thing4[SIZE];

for(int i = 0; i < SIZE; i++)

d[i] = b[i].clone();

System.out.println(

"Duplication via cloning: " +

timer.duration() + " Milliseconds");

}

}

/* Output:

Duplication via serialization: 516 Milliseconds

Duplication via cloning: 71 Milliseconds

*/