Problems with GregorianCalendar.add(Calendar.WEEK_OF_YEAR, 1)

Question

hi all
i'm writing an application to calculate all the days of all the week of the year
i got 2 buttons, one to forward to the next week, the other to go back to the last
this is my code:
GregorianCalendar now = new GregorianCalendar();
DateFormat week=new SimpleDateFormat( "w" ); 
private void b_proxActionPerformed(java.awt.event.ActionEvent evt)
//the next week
        now.add(now.WEEK_OF_YEAR, 1);                      
        System.out.println("week "+week.format(now.getTime()));
private void b_precActionPerformed(java.awt.event.ActionEvent evt) {
        now.add(now.WEEK_OF_YEAR, -1);    
         System.out.println("week "+week.format(now.getTime()));
}the problem is that, when i want to skip to the next week i get:
WEEK 25 (the current week)
WEEK 26
WEEK 28
WEEK 30
like i were add 2, but i added 1 to the week value!!!
and when i want to return to the previous week (by pressing the second button), the week number is always the same!!
anyone could help me?
thanx
sandro

Answer 1

Whether it matters or not, just simply stating that it's correct.
Here's my code that worked correctly ...
Calendar time = new GregorianCalendar();
SimpleDateFormat sdf = new SimpleDateFormat("w");
for(int i=0; i < 10; i++)
    System.out.println("week in year: "+time.get(Calendar.WEEK_OF_YEAR));
    System.out.println("Week in year by sdf: "+sdf.format(time.getTime()));
    time.add(Calendar.WEEK_OF_YEAR, 1);
}