Time to serialize 10,000 simple objects to a disk file usi

Question

I heard the default serialization routine is slow. So how slow. Let's say I have 10,000 simple objects. How long does it take to serialize them to a disk file using standard Java serialization?
Can anybody give some idea?
Thanks a lot !

Answer 1

The following is my program to test :
import java.io.*;
import java.util.*;
public class Serialization implements Serializable {
public static void main(String[] args) {
     long startTimeInMill = 0 ;
     long endTimeInMill = 0;
          try {
          startTimeInMill = new GregorianCalendar().getTimeInMillis();
               System.out.println("start Mill is " + startTimeInMill);
               FileOutputStream out = new FileOutputStream("theTime");
               ObjectOutputStream s = new ObjectOutputStream(out);
               for (int i = 1; i < 100000; i++) {
                    s.writeObject("Today");
                    Date outputDate = new Date();
                    s.writeObject(outputDate);
                    s.flush();
          } catch (FileNotFoundException e) {
          } catch (IOException e) {
     endTimeInMill = new GregorianCalendar().getTimeInMillis();
     System.out.println("Endtimeinmill is : " + endTimeInMill);
     System.out.println("It takes " + (endTimeInMill - startTimeInMill) + " milliseconds to serialize 10,000 Date objects");
And the following is the result:
start Mill is 1083635995578
Endtimeinmill is : 1083635997937
It takes 2359 milliseconds to serialize 10,000 Date objects
Specs of my hardware: Win2k, CPU 1.8G, DDR RAM: 756 MB