Mega Code Archive
Serializable and clone
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// : appendixa:Compete.java
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
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.err.println("Thing3 can't clone");
}
return o;
}
}
class Thing4 implements Cloneable {
private Thing3 o3 = new Thing3();
public Object clone() {
Thing4 o = null;
try {
o = (Thing4) super.clone();
} catch (CloneNotSupportedException e) {
System.err.println("Thing4 can't clone");
}
// Clone the field, too:
o.o3 = (Thing3) o3.clone();
return o;
}
}
public class Compete {
public static final int SIZE = 25000;
public static void main(String[] args) throws Exception {
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();
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");
}
} ///:~
]]>