In my game are ducks. Atm I'm moving them some pixels in every loop. MY problem is, that the ducks are moving faster on new computers, and on old computers they're moving slowly. How could i fix that?

And btw if you see a mistake in my code pls post suggestions

https://github.com/ritonda66/EntenShooter/blob/master/src/org/shooter/gamePanel.java

Idea how to do it?
and yes i tryed mutliple times but it never worked

I added it and i tryed something.
i added a methode that generates a number beetween 1-10. If the number is over 5, then it shows image "Dirt". Its the number is lower then 5, then it shows "air". When i run it it generates each time a new map. How to stop it, that it generates at the start ONE time, and after that it doesnt anymore?

How to make that?
Is there a tut about it? if yes please post here the link to it

now im using
millis = System.currentTimeMillis() - startTime;
hours = millis / (1000 * 60 * 60);
millis -= hours * (1000 * 60 * 60);
minutes = millis / (1000 * 60);
millis -= minutes * (1000 * 60);
seconds = millis / 1000;
g.drawString("Time: " + hours + ":" + minutes + ":" + seconds, 300, 10);
is there a way to make it stop? for example press pause, the timer freezes, again pause and it works?

are there good 3d game tutorials?(for beginners with 3d)
i searched for a while, but i didnt find something good

its faster now

tyvm works now

my source
https://github.com/ritonda66/shooter/blob/master/src/ch/shooter/gamePanel.java
problem:
when im clicking on the jar. nothing happends for 5-10 secs then it opens. BUT WHY???