Do you mean wait one second of real time?  In that case, you need a
Timer.  See http://mindprod.com/jgloss/timer.html

Do you mean simulate one second of time? In that case, you add 1 to t.
and calculate your formulas for whatever else you need using t as a
parameter.

Then you problem has nothing at all to do with acceleration.  What you want is
a way to have code executed at regular intervals (in wall-clock time).  There
are two Timer classes provided in the standard library, java.util.Timer and
javax.swing.Timer, one or the other will probably do what you want.  Or, if
not, then you could create your own kind of timer using a helper thread, and
Thread.sleep().

   -- chris

I think you have to create a Thread to calculate your formula. Try with
this:

public class Clock extends Thread {

 public Clock() {
   super();
 }

 public void run() {
   while(true) {
     try {
       /* YOUR FORMULA */
       this.sleep(1000);
     }
     catch(InterruptedException e) {}
   }
 }

 public static void main(String args[]) {
   Clock c = new Clock();
   c.start();
   ...
 }
}

This isn't a good method because it calculate your formula after one
second plus the time your computer execute the formula in the previus
cicle. A better solution is to add this code:

try {
 long start = System.currentTimeInMillis();
 /* YOUR FORMULA */
 long end = System.currentTimeInMillis();
 this.sleep(1000 - (start - end));
}

Of sure there are better solutions than mine. This is the first one
that I guess.

For more information take a look at
http://java.sun.com/j2se/1.3/docs/api/java/lang/Thread.html

On Tue, 18 Apr 2006 18:19:15 -0700, James McGill
<jmcgill@cs.arizona.edu> wrote, quoted or indirectly quoted someone
who said :

We did trig and calculus in high school. I don't think I did numerical
integration and differential equation solving until perhaps my 4th
year of university.

I remember Anthony Ralston, the esteemed author of our numerical
analysis textbook came to visit circa 1968.  I asked him about how you
might go about interpolating for use in computer animation, to produce
"well behaved" curves similar to those you could get with a  Staedtler
Mars interpolation snake. (I had been playing around with polynomials
that were erratic).

He upbraided me for such as silly question since it there was no
mathematics behind the desired interpolation, just a desired empirical
result. To be fair, computer animation had not been invented at the
time, and the pen plotter was still a novelty.

Later I discovered the spline curves and of course today there are
millions of dollars spent computing such "meaningless" functions.

I got a similar brush off from Walt Disney in 1975 when I tried to
explain a scheme for 2D computer animation.