87 lines
2.3 KiB
Java
87 lines
2.3 KiB
Java
// references/Compete.java
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// (c)2016 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://mindviewinc.com/Books/OnJava/ for more book information.
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import java.io.*;
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class Thing1 implements Serializable {}
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class Thing2 implements Serializable {
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Thing1 t1 = new Thing1();
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}
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class Thing3 implements Cloneable {
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@Override
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public Thing3 clone() {
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try {
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return (Thing3)super.clone();
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} catch(CloneNotSupportedException 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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class Thing4 implements Cloneable {
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private Thing3 t3 = new Thing3();
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@Override
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public Thing4 clone() {
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Thing4 t4 = null;
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try {
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t4 = (Thing4)super.clone();
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} catch(CloneNotSupportedException e) {
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throw new RuntimeException(e);
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}
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// Clone the field, too:
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t4.t3 = t3.clone();
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return t4;
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}
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}
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public class Compete {
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public static final int SIZE = 100000;
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public static void
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main(String[] args) throws Exception {
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Thing2[] a = new Thing2[SIZE];
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for(int i = 0; i < SIZE; i++)
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a[i] = new Thing2();
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Thing4[] b = new Thing4[SIZE];
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for(int i = 0; i < SIZE; i++)
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b[i] = new Thing4();
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long t1 = System.currentTimeMillis();
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try(ByteArrayOutputStream buf =
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new ByteArrayOutputStream();
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ObjectOutputStream oos =
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new ObjectOutputStream(buf)) {
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for(Thing2 a1 : a) {
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oos.writeObject(a1);
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}
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// Now get copies:
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try(ObjectInputStream in =
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new ObjectInputStream(
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new ByteArrayInputStream(
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buf.toByteArray()))) {
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Thing2[] c = new Thing2[SIZE];
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for(int i = 0; i < SIZE; i++)
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c[i] = (Thing2)in.readObject();
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}
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}
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long t2 = System.currentTimeMillis();
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System.out.println(
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"Duplication via serialization: " +
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(t2 - t1) + " Milliseconds");
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// Now try cloning:
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t1 = System.currentTimeMillis();
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Thing4[] d = new Thing4[SIZE];
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for(int i = 0; i < SIZE; i++)
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d[i] = b[i].clone();
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t2 = System.currentTimeMillis();
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System.out.println(
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"Duplication via cloning: " +
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(t2 - t1) + " Milliseconds");
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}
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}
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/* Output:
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Duplication via serialization: 202 Milliseconds
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Duplication via cloning: 17 Milliseconds
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*/
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