Getting error while running DateDisplay program

Question

Please help me.
I wrote this sample program:
     Chapter 2 Sample Program: Displays Formatted Date Information
     File: Ch2DateDisplay.java
import javax.swing.*;
import java.util.*; //for Date
import java.text.*; // for SimpleDateFormat
class Ch2DateDisplay {
     public static void main(String[] args) {
     Date today;
     SimpleDateFormat simpleDF1,
                simpleDF2;
     today = new Date();
     simpleDF1 = new SimpleDateFormat();
     simpleDF2 = new SimpleDateFormat("EEEE MMMM dd, yyyy");
     //Default short format display
     JOptionPane.showMessageDialog(null, "Today is" + simpleDF1.format(today));
     //Programmer-designated long format display
     JOptionPane.showMessageDialog(null, "Today is" + simpleDF2.format(today));
}I am getting this error
E:\Java Programs>javac Ch2DateDisplay.java
E:\Java Programs>java  Ch2DateDisplay
Exception in thread "main" java.lang.IllegalArgumentException: Cannot format giv
en Object as a Date
        at java.text.DateFormat.format(DateFormat.java:279)
        at java.text.Format.format(Format.java:133)
        at Ch2DateDisplay.main(Ch2DateDisplay.java:22)
E:\Java Programs>Here is the screenshot
http://i16.photobucket.com/albums/b50/ejaz2006/error.gif
Please help me what should I do ??
I m using jdk-1_5_0-windows-i586.exe
Thanks in Advance

Answer 1

Thank you so much my friend.. but I dont know why do I get this error..
I also installed jdk-1_5_0_15-nb-6_1-windows.exe but still getting the same problem
But I downloaded Sample files from http://drcaffeine.com/student/student.htm
When I copied the class file from the above mentioned file its work properly.
The problem is when I use javac command to make class file its show no error, but after running using java command its show the same error...