hello list, im trying to understand oop in processing... and im having some problems....
i trying to create an animated dot using oop, i want that everytime i create an object an animated dot appears in my sketch with a random position , but it doesnt work, my dot always appear in the same position, can anybody explain me why is this happening and how can i fix this? many thanx in advance... here is the code:

punto objeto;

void setup()
{
 size(200, 200);
 stroke(255);
 framerate(30);

objeto=new punto(200,200);
}
void draw()
{
background(51);
objeto.display();
}
class punto
 {
   int x;
   int y;
punto( int xa, int ya){
float xf=random(xa);
float yf=random(ya);
int x= int(xf);
int y= int(yf);
print(x);

   }
 
 void display(){
    x = x - 1;
 if (x < 0) {
   x = height;
 }
   point(x,y);
   }  

}