# How to add to an ArrayList every x seconds?
**URL:** https://discourse.processing.org/t/how-to-add-to-an-arraylist-every-x-seconds/31609
**Category:** Coding Questions
**Created:** [August 7, 2021, 10:01am UTC](https://discourse.processing.org/t/how-to-add-to-an-arraylist-every-x-seconds/31609 "2021-08-07T10:01:20Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@chaotic.rabbit](https://discourse.processing.org/u/chaotic.rabbit)
#### Post date: [August 7, 2021, 10:01am UTC](https://discourse.processing.org/t/how-to-add-to-an-arraylist-every-x-seconds/31609/1 "2021-08-07T10:01:20Z")
void setup(){
jellies = new ArrayList();
for(int i=0; i\<=5; i++){
jellies.add(new Jellyfish(random(0, 800), random(height), random(-40, 40), random(0.05, 0.35)));
}
for(int i = jellies.size()-1; i\>=0; i–){
Jellyfish jellyfish = jellies.get(i);
jellyfish.display();
}
if(millis()-timer\>=2000){
jellies.add(new Jellyfish(random(0, 800), 850, random(-40, 40), random(0.05, 0.35)));
timer=millis();
}
The above is just part of the code. I would like to display a new jellyfish coming from the bottom of the screen every 5 seconds. At first it works but after a while they start popping in the middle of the screen and stop completely.
Thanks!!
---
### Author:  [@glv](https://discourse.processing.org/u/glv)
#### Post date: [August 7, 2021, 11:29am UTC](https://discourse.processing.org/t/how-to-add-to-an-arraylist-every-x-seconds/31609/2 "2021-08-07T11:29:14Z")
Hello,
A good place to start:
> **Click here for resources**
>
> I encourage you to look at the resources available here:
>
> **Beginner**
>
> - The Processing website has _references_ , _examples_ , _tutorials_ , etc.
> [https://processing.org/](https://processing.org/)
> - The Processing PDE (IDE) has lots to offer!
> An exploration of the menu items will reveal what is available!
> You will find _libraries_ , _tools_ , _examples_ and more!
> For example:
> 
> - The Coding Train
> [https://www.youtube.com/channel/UCvjgXvBlbQiydffZU7m1\_aw](https://www.youtube.com/channel/UCvjgXvBlbQiydffZU7m1_aw)
> [https://thecodingtrain.com/](https://thecodingtrain.com/)
> - Happy Coding
> [https://happycoding.io/tutorials/processing/](https://happycoding.io/tutorials/processing/)
>
> **Advanced**
>
> - The source code can give insight if you are adventurous:
> [GitHub - processing/processing: Source code for the Processing Core and Development Environment (PDE)](https://github.com/processing/processing)
> Many of the Processing functions are here:
> [https://github.com/processing/processing/blob/master/core/src/processing/core/PApplet.java](https://github.com/processing/processing/blob/master/core/src/processing/core/PApplet.java)
> - And the Internet.
_ **Please** _ format your code:
[https://discourse.processing.org/faq#format-your-code](https://discourse.processing.org/faq#format-your-code)
You need to understand some basic elements before you begin:
- [Variable Scope / Examples / Processing.org](https://processing.org/examples/variablescope.html)
- [setup() / Reference / Processing.org](https://processing.org/reference/setup_.html)
- [draw() / Reference / Processing.org](https://processing.org/reference/draw_.html)
Check out out the tutorials, examples and references and there you will find what you need.
Get a basic timer working first and then use that to add to the [ArrayList](https://processing.org/reference/ArrayList.html).
`:)`