Hi,

i´m trying to programm a simple observer pattern. I use toxi´s verlet physics lib and try to connect particles via an observer pattern, so they can communicate with one another. I want to achieve different agent behavior that can change dependent on messages an agent recieves. I´m at the very beginning and don´t really know where it will lead me to, so i try to programm something really basic that can be easily extended. But at the moment i always get an exception that say´s
"unexpected token void" at my "void setup(){" line.
When i comment out my interfaces and all the stuff which has to do with it, no problem no more. But i can´t find any syntax error or something like that. Maybe i´m to blind, or maybe i don´t know enough about the usage of interfaces. I don´t know, so help is really welcome. I´m using Processing 1.2.1 (with java) on a windows 7 64bit system.

1. import toxi.geom.*;
   import toxi.physics.*;
   import processing.opengl.*;
   
   VerletPhysics physics;
   Vec3D gravity;
   DropBall ballA,ballB;
2. 
   void setup(){
     size(800,400,OPENGL);
      
     physics = new VerletPhysics();
     physics.setGravity(new Vec3D(0,0.1,0));
     physics.setWorldBounds(new AABB(new Vec3D(0,0,0),new Vec3D(width,height,100)));
    
     ballA = new DropBall(width/3,0.f,0.f);
     ballB = new DropBall((width/3)*2,100.f,0.f);
    
     ballA.addSubject(ballB);    
     ballB.addObserver(ballA);  
    
     physics.addParticle(ballA);
     physics.addParticle(ballB); 
   }
   
   void draw(){
     physics.update();
     background(0);
     ballA.display();
     ballB.display(); 
   }
3. class Agent extends VerletParticle implements Observer, Subject{ 
    
     ArrayList lsObserver, lsSubject, data; 
    
     Agent(float x, float y, float z){
       super(x,y,z);
       lsObserver = new ArrayList();
       lsSubject = new ArrayList();
       data = new ArrayList();
     } 
    
    //-----------------------------------------------------
   //Observer methods
   
     void addSubject(Subject s){                                   
       lsSubject.add(s);
     }
     Subject updateData(Subject s,ArrayList data){      
       this.data = data;
       return s;   
     }
     ArrayList getData(){                                             
       return data;
     }
     //----------------------------------------------------
     //Subject methods
    
     void addObserver(Observer o){                             
       lsObserver.add(o);
     }
     void deleteObserver(Observer o){                         
       int i = lsObserver.indexOf(o);
       if(i>=0){
         lsObserver.remove(o);
       }
     }
     void sendData(){                                              
       for(int i=0;i<lsObserver.size();i++){
         Observer o = (Observer) lsObserver.get(i);
         o.updateData(this,data);
       }
     }
4. }
   
   class DropBall extends Agent{
      
     DropBall(float x, float y, float z){
       super(x,y,z);
     }
    
     void display(){
       stroke(255);
       pushMatrix();
         translate(x,y,z);
           beginShape(LINES);
             vertex(-10,0,0);
             vertex(10,0,0);
             vertex(0,-10,0);
             vertex(0,10,0);
             vertex(0,0,-10);
             vertex(0,0,10);
           endShape();
       popMatrix();   
     } 
    
     void doSomething(){
       print("i am a drop ball at position: " + x + ", " + y + ", " + z + "/n");
     }   
   }
5. interface Observer{                                         
     void addSubject(Subject s);
     Subject updateData(Subject s,ArrayList l);
     ArrayList getData(); 
   }
6. interface Subject{                                        
     void addObserver(Observer o);
     void deleteObserver(Observer o);
     void sendData();
   }
   
   
   

        thanx