` and not just use `List` right?
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### Author:  [@CreCo](https://discourse.processing.org/u/CreCo)
#### Post date: [September 19, 2022, 5:16pm UTC](https://discourse.processing.org/t/i-have-some-trouble-with-a-arraylist/38863/5 "2022-09-19T17:16:04Z")
Ok, I get more trouble
I’m working on Processing 4,0b7.
And I have replaced
ArrayList allPoints = new ArrayList();
by
List allPoints = new ArrayList();
new I get the Error:
Cannot find a class or type named “List”
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### Author:  [@NumericPrime](https://discourse.processing.org/u/NumericPrime)
#### Post date: [September 19, 2022, 5:17pm UTC](https://discourse.processing.org/t/i-have-some-trouble-with-a-arraylist/38863/6 "2022-09-19T17:17:49Z")
Write `import java.util.*;` at the beginning of your sketch.
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### Author:  [@CreCo](https://discourse.processing.org/u/CreCo)
#### Post date: [September 19, 2022, 5:25pm UTC](https://discourse.processing.org/t/i-have-some-trouble-with-a-arraylist/38863/7 "2022-09-19T17:25:12Z")
Ok I have import java.util.\*;
My Program will run with maximal 3 C1 in C2.
But for more C1 in C2 the Program starts and Does nothing
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### Author:  [@NumericPrime](https://discourse.processing.org/u/NumericPrime)
#### Post date: [September 19, 2022, 5:26pm UTC](https://discourse.processing.org/t/i-have-some-trouble-with-a-arraylist/38863/8 "2022-09-19T17:26:23Z")
What do these 3 methods that operate on your ArrayList do?
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### Author:  [@CreCo](https://discourse.processing.org/u/CreCo)
#### Post date: [September 19, 2022, 5:34pm UTC](https://discourse.processing.org/t/i-have-some-trouble-with-a-arraylist/38863/9 "2022-09-19T17:34:23Z")
I hope this excerpts will help
class PointsOfPosenenskeWeb{
// Declare the ArrayList allPoints to Hold all PointOfPosenenskeWeb Components
List allPoints = new ArrayList();
// Function to generate a single new PointOfPosenenskeWeb
void MakeRandomPoints(){
// Add PointOfPosenenskeWeb to ArrayList allPoints
allPoints.add(new PointOfPosenenskeWeb());
// Intialisate new PointOfPosenenskeWeb
int sice = allPoints.size();
allPoints.get(sice-1).CreateRandomlySpreadedPoint();
}
void InitalisePoints(){
for(int x = 0; x \< 3; x = x + 1)
{
MakeRandomPoints();
}
}
// Draw all PointOfPosenenskeWeb from allPoints
void DrawPoints(){
// For Loop about all PointOfPosenenskeWeb to daraw
for(PointOfPosenenskeWeb pointxy : allPoints){
pointxy.Draw();
}
}
// BrownienMovement for all PointOfPosenenskeWeb from allPoints
void BrownienMovement(){
// For Loop about all PointOfPosenenskeWeb to get BrownienMovement
for (PointOfPosenenskeWeb point : allPoints) {
point.BrownienMovement();
}
}
_ **and before** _
class PointOfPosenenskeWeb extends Point{
// Method to Construct the PointOfPosenenskeWeb
void CreateRandomlySpreadedPoint() {
super.X\_Seter( int(random(0, width))); // Randomly Choose X Coordinate from Width of Canvss
super.Y\_Seter(int(random(0, height))); // Randomly CHoose Y Coordinate from Heigt of Canvas
}
// Methode to draw the Point
void Draw()
{
circle(super.X\_Geter(), super.Y\_Geter(), 20); // Draw the Point as a White Circle
}
// Methode to get some BrownienMovement with the PointOfPosenenskeWeb
void BrownienMovement()
{
// Chache for new Coordinates of Point
int next\_x = -11; // Set x Value to begining wrong Value
int next\_y = -11; // Set y Value to begining wrong Value
```
// Speed Factor for Brownien Motion
float factor = 120;
// While Loop to get a correct x Coordinate
while( (next_x < 12 ) || ( next_x > (width-12) ))
{
next_x = int(super.X_Geter() + random(-(width/factor), (width/factor))); // Random Motion Equation
}
// While Loop to get a correct y Coordinate
while( (next_y < 12) || ( next_y >( height -12 )))
{
next_y = int(super.Y_Geter() + random(-(height/factor), (height/factor))); // Random Motion Equation
}
// Seters for new correct Values
super.X_Seter(next_x); // Set new X Value
super.Y_Seter(next_y); // Set new Y Value
```
}
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### Author:  [@NumericPrime](https://discourse.processing.org/u/NumericPrime)
#### Post date: [September 19, 2022, 5:52pm UTC](https://discourse.processing.org/t/i-have-some-trouble-with-a-arraylist/38863/10 "2022-09-19T17:52:40Z")
> [@CreCo](#):
>
> for(int x = 0; x \< 3; x = x + 1)
> {
> MakeRandomPoints();
> }
Is this the code where you set how many points you want to define?
Another thing would be replacing List with
```auto
List
```
I don’t know how this is with higher Processing versions but in my case this won’t even run without.
Another thing would be checking for infinite Loops by adding a println in the draw section.
Using ungodly amounts of println commands is generally a good practice for debugging!
I would also recommend you try to learn to use constructors these can make your code easier to read and use.
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### Author:  [@CreCo](https://discourse.processing.org/u/CreCo)
#### Post date: [September 19, 2022, 6:10pm UTC](https://discourse.processing.org/t/i-have-some-trouble-with-a-arraylist/38863/11 "2022-09-19T18:10:53Z")
Sorry, firstly this Method will call another Method who build the Points.
I have written this Function to become a Starting Point for my App.
The called Function then is:
void MakeRandomPoints(){
// Add PointOfPosenenskeWeb to ArrayList allPoints
allPoints.add(new PointOfPosenenskeWeb());
// Intialisate new PointOfPosenenskeWeb
int sice = allPoints.size();
allPoints.get(sice-1).CreateRandomlySpreadedPoint();
}
This latter Function should create one more Point. It will bee letter used to dynamically add new Points to the Set, and a - just not written - later Function should dynamically remove some Points.