How do I make multiple objects form the same class, if I want to make a million, without having to write the same thing a million times over and over?

How can I get them to not overlap each other?

And how can I get them to bounce off things like, rect() and ellipse()  ?

I'm using a white background with black ellipses and rectangels, maybe this helps..

I'm working with Vec3D, so please keep that in mind ^_^

Thanks in advance!

I'm working on a project, the purpose is to have some ellipses follow the mouse and bounce off black objects.

The background is in black and white to make it simple.

But I get this error: The constructor PVector(int,int) is undefined..

Here is my code:

2. class Agent {
3. 
   
4.   PVector location;
5.   PVector acceleration;
6.   
7. 
   
8.   Agent() {
9.     location = new PVector(90,70);
10.     acceleration = new PVector(1,1);
11.   }
12. 
    
13.   void run() {
14. 
    
15.     display();
16. 
    
17.     update();
18. 
    
19.     followMouse();
20.   }
21.   void followMouse() {
22. 
    
23.     PVector target = new PVector(mouseX, mouseY);
24. 
    
25.     PVector dif = PVector.sub(target,loc);
26. 
    
27.     float distance = dif.mag();
28. 
    
29.     dif.normalize();
30. 
    
31.     dif.div(100);
32.     acc.add(dif);
33.   }
34.   void update() {
35. 
    
36.     vel.add(acc);
37. 
    
38.     vel.limit(7);
39. 
    
40.     loc.add(vel);
41. 
    
42.     acc = new PVector();
43.   }
44.   void display() {
45.     stroke(0);
46.     fill(255);
47.     ellipse(loc.x, loc.y, 10, 10);
48.   }
49. 
    
50. //  void botsen() {
51. //    if ((loc.x == 622) || (loc.x == 25))
52. //    { 
53. //      vel = vel*-1;                           This is unimportant, thats why it has the // 's
54. //    }
55. //  }
56. }  

and this:

2. Agent a;
3. 
   
4. void setup() {
5.   size (647, 694);
6.   PImage img1;
7.   smooth();
8.   img1 = loadImage("Klembord01.gif");
9.   a = new Agent();
10. }
11. 
    
12. void draw() {
13.   fill(255, 10);
14.   PImage img1;
15.   img1 = loadImage("Klembord01.gif");
16.   image(img1, 0, 0);
17.   a.run();
18. }

Any idea of how I can fix it?

I do not understand what it means.

Eventually this program should have 'Agents' (ellipses) which are following my mouse movement. They should also bounce off black colored objects (this is not yet included in current coding).