I have been to the wikipedia page, researched it within the processing website, and looked at examples. I cannot figure this problem out. My goal is to make multiple "fireworks" when I click the mouse, but I keep getting an error that something is wrong with the array, but it looks like all of the examples I have looked at!

I am trying to make multiple "fireworks" where ever I click the mouse, but it says I am missing a semicolon. I have tried comparing it to other things alike the mousePressed I am trying to use, but it is not working. Am I missing something that someone else can see?

1. int numParticles = 200;
   
   GenParticle [] p = new GenParticle[numParticles];
   //GenParticle [] p = new GenParticle[1];
   
   float r=170;
   float g=150;
   float b=85;
   
   void setup(){
     size(500,500);
     noStroke();
     smooth();
     frameRate(30);
     for (int i=0; i<p.length; i++){
       float velX = random(-1,1);
       float velY = -i;
       //Inputs: x,y,x-velocity,y-velocity,
       //radius,origin x,origin y
       p[i]=new GenParticle(width/2,height/2,velX,velY,5.0,width/2,height/2);
     }
   }
   
   void draw(){
     fill(0,20);
     rect(0,0,width,height);
    
     fill(255,60);
     for(int i=0; i<p.length; i++){
       p[i].update();
       p[i].regenerate();
       p[i].display();
     }
   }
    
   void mousePressed() {
       GenParticle gp = new GenParticle(mouseX,mouseY,float velx,float vely,5.0,mouseX,mouseY);
       p = (GenParticle[]) append(gp,p);
   }
2. class GenParticle extends Particle{
     float originX,originY;
   
    
     GenParticle(int xIn,int yIn,float vxIn,float vyIn,float r,float ox,float oy){
       super(xIn, yIn, vxIn, vyIn, r);
       originX=ox;
       originY=oy;
     }
    
     void regenerate(){
       if ((x>width+radius) || (x<-radius) || (y>height+radius) || (y<-radius)){
         x=originX;
         y=originY;
         vx=random(-1.0,1.0);
         vy=random(-4.0,-2.0);
       }
     }
   }
3. class Particle{
     float x, y;
     float vx,vy;
     float radius;
     float gravity=0.1;
     float r=0;
     float g=0;
     float b=0;
    
     Particle(int xpos,int ypos,float velx,float vely,float r){
       x=xpos;
       y=ypos;
       vx=velx;
       vy=vely;
       radius=r;
     }
    
     void update(){
       vy=vy+gravity;
       y += vy;
       x += vx;
     }
    
     void display(){
       fill(r,g,b);
       ellipse(x, y, radius*3,radius*3);
    
     if(mouseX>width/2){
       r=r+9;
        }else{
         g=g+6;
        }
   
     if(mouseY>height/2){
       b=b+7;
        }else{
         b=b-3;
        }
    
     if(keyPressed) {
       g=g+1;
        }else{
         g=g-5;
        }
   
     r=constrain(r,0,255);
     g=constrain(g,0,255);
     b=constrain(b,0,255);
     }
   }