Hi there ! I'm still trying to begin in processing (and I get some problem)

I get a "unexpected token:void" error on the "void draw" of the main part, and I don't understand why °_° so if anyone can give me a hand, I would love that, cause I don't know what to do.

here is the main part :

Boule[] boules = new Boule[20];

float[] x = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
float[] y = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
float[] r = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
float[] m = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

float xv;      
float yv;


int x_ecran = 400 ;
int y_ecran = 400 ;
int xMilieu = 300;
int yMilieu = 300;

int a;
int b;


float gravite;



void setup() {
 size(x_ecran,y_ecran);
 smooth();
 
 x[0]=100;
 x[1]=150;
 
 y[0]=150;
 y[1]=220;
 
 r[0]=50;
 r[1]=12;
 
 m[0]=7;
 m[1]=1;
 
for(int i=0; i<boules.length; i++){
     float r_init = r[i];
     float x_init = x[i];
     float y_init = y[i];
     float m_init = m[i];
     boules[i] = new Boule(r_init, x_init, y_init, m_init); }  
 

 gravite = .015;

void draw() {
 background(255);
 
for(int i=0; i<boules.length; i++){

 boules[i].bouge();
 
 a = i;
 b = i;
 a != b;
 
 boules[a].appliquerGravite(boules[b]);

 boules[i].rebondir_ecran();

 boules[i].dessine();
}
}







and also, I don't know if it can be related to this but here is the "boules" class part :






class Boule {
 
 float r;    // rayon
 float x,y; // position

 color c = color(0,0);
 
 float xv = 0;       //vélocité actuelle le long de l'axe des x
 float yv = 0;       //vélocité actuelle le long de l'axe des y
 
 float xd;        // Distance to target along x axis
 float yd;        // Distance to target along y axis
 float d;  // Distance to target
 
 float gAngle;  
 float gTheta;   //angle en radians
 float gxv;      // gravité en x
 float gyv;      // gravité en y
 float m;      // masse particule
   


void appliquerGravite(){
   gAngle     = calculAngle(x, y, f.x, f.y);
   gTheta     = (-(gAngle * PI))/180;
   gxv        = cos(gTheta) * (-gravite/(r/6));
   gyv        = sin(gTheta) * (-gravite/(r/6));
   
   
   f.xv += m*f.gxv;
   f.yv += m*f.gyv;
   xv += m*gxv;
   yv += m*gyv;
 }
   
   void bouge(){
   
   x       +=   xv; //incr&#65533;mente x equivalent a x = x +xspeed
   y       +=   yv;
   
 }
   
 void rebondir_ecran(){
 
      if (x > x_ecran-50){
        xv = xv-(4/r);}
      if(x < 50){
        xv = xv+(4/r);}
       
      if (y > y_ecran-50){
        yv = yv-(4/r);}
      if(y < 50){
        yv = yv+(4/r);}
      }
 
 
  void rebondir(){
 
  xv    *=    -1;
  yv    *=    -1;
  f.xv  *=    -1;
  f.yv  *=    -1;
  }
  void allume (){
 
 c = color(150,50);
 xd = x - f.x;
 yd = y - f.y;
 
 
  }
 
   boolean approche() {
 
 float distance = dist(x,y,f.x,f.y);
 
   calculDistance(x, y, f.x, f.y);
     if (d < 2*r + 2*f.r) {
     return true;
   } else {
     return false;
   }
 }
 
  boolean intersect() {
 
   calculDistance(x, y, f.x, f.y);
     if (d < r + f.r) {
     return true;
   } else {
     return false;
   }
 }
 
 void dessine () {
 
  noStroke();
  fill(c);
  ellipse(x,y,r*2,r*2);
  c = color(0,0,0,128);
     }
     
float calculDistance(float x1, float y1, float x2, float y2){
 xd = x1 - x2;
 yd = y1 - y2;
 d = sqrt(xd * xd + yd * yd);
 return d;
 
}


float calculAngle ( float x1, float y1, float x2, float y2){
   float  xd = x1 - x2  ;
   float  yd = y1 - y2   ;
 
float t = atan2 (yd,xd);
float a =(180 + (-(180*t) / PI));
return a;
}
}

waaaaa shame on me -_- I forget a }, it was too late yesterday to work for me , thanks a lot dude ! and thanks also for your advices !

trop de cafe tue le cafe (et la tete avec ^^)

It seems to me that instead of using arrays for x, y, r, and m, these should be members of your Boule class.

Also, no that's not how you define a class method, or any function for that matter.

In the parameter list (the stuff between the parentheses) you first give a type and then a name that you will refer to the variable as.  So in your case it would look like:

void appliquerGravite(Boule some_boule){

}

obviously you can change some_boule to whatever you want to call it.

i suggest you read a tutorial on OOP. here is one:
http://java.sun.com/docs/books/tutorial/java/concepts/index.html