Hero theHero;
public Bullet[] bullets = new Bullet[10000];
public static int bulletCount = 0;
void setup(){
  size(300,600);
  theHero = new Hero(color(255,0,0),mouseX,mouseY);
}

void draw(){
background(255);
for(int i = 1; i <= bulletCount;i++){
  bullets[i].updatePos();
  bullets[i].displayb();
}
theHero.move();
theHero.display();
}

class Hero {
 color c;
 float xpos;
 float ypos;

Hero(color tempC,float tempXpos, float tempYpos){
  c = tempC;
  xpos = tempXpos;
  ypos = tempYpos;
}

 void display() {
  stroke(0);
  fill(c);
  rectMode(CENTER);
  rect(xpos, ypos, 20, 10);
}

void move() {
 xpos = mouseX;
 ypos = 580;
 }
}

public class Bullet {
color c;
float xpos;
float ypos;
float yspeed;

void displayb() {
   stroke(0);
   fill(c);
   rectMode(CENTER);
   rect(xpos, ypos, 5, 5);
}

public Bullet(color tempC, float tempXpos, float tempYpos, float tempYspeed) {
  c = tempC;
  xpos = tempXpos;
  ypos = tempYpos;
  yspeed = tempYspeed;
}

public void updatePos(){
  ypos+= yspeed;
}

}
  void mouseClicked(){
        bulletCount++;
        float startX = theHero.xpos;
        bullets[bulletCount] = new Bullet(color(255,0,0),startX,theHero.ypos, -5 /*YSPEED*/);

  }