Java Object Creation

Question

A general question about how can Java object creation with an average amount of data retrieval is considered as a reasonable.
For example if I am clicking on a link in a web application...to paint that page, I think, about 4-5 java object with an average data retrieval of 20 rows wud be considered as appropriate. Any other thoghts or any other parameters to take into consideration?

Answer 1

If you are concerned about object creation speed, you probably shouldn't. Even my laptop PC can create and garbage collect some 12 million objects per second (10,000,000 objects takes about 800 milliseconds). Test program below; remember to run with "java -server" to get the faster optimizing compiler. For laughs, write an equivalent C++ program that does new&delete in a similar loop.
public class CreateObject
    public static void main(String args[])
     throws Exception
     for (int m = 0; m < 5; m++)
         doit();
    static void doit()
     long start = System.currentTimeMillis();
     for (int n = 0; n < 10 * 1000 * 1000; n++) {
         new CreateObject();
         new CreateObject();
         new CreateObject();
         new CreateObject();
         new CreateObject();
         new CreateObject();
         new CreateObject();
         new CreateObject();
         new CreateObject();
         new CreateObject();
     long end = System.currentTimeMillis();
     System.out.println((end - start) + " ms");
}