处理过程中出现大括号问题

当我运行代码时,我的代码返回一个错误,告诉我“有太多的{个字符没有一个}与之匹配”,但我已经检查了一遍,再次检查了三遍,甚至让其他人为我检查,但都无济于事。

class Ball {
  //Global Vars
  //float x=0;
  //float y=0;
  //float speedx = random(-5,5);
  //float speedy = random(-1,1);

  Vec3D loc = new Vec3D (0, 0, 0);
  Vec3D speed = new Vec3D (random(-4, 4), random(-1, 1), 0);

  Vec3D acc = new Vec3D();

  Vec3D grav = new Vec3D (0, random(0.05, 0.25), 0);

  //construct
  Ball(Vec3D _loc) {

    loc = _loc;
  }

  //functions
  void run() {
    display();
    move();
    bounce();
    //  gravity();
    lineBetween();
    flock();
  }

  void display() {
    stroke(0);
    ellipse(loc.x, loc.y, 20, 20);
  }


  void move() {
    // x += speedx;
    // y += speedy;

    speed.addSelf(acc);
    speed.limit(6);
    loc.addSelf(speed);
    acc.clear();
  }

  void bounce() {
    if (loc.x > width) {
      speed.x = speed.x*-1;
    }
    if (loc.x < width-width) {
      speed.x = speed.x*-1;
    }
    if (loc.y > height) {
      speed.y = speed.y*-1;
    }
    if (loc.y < height-height) {
      speed.y = speed.y*-1;
    }
  }

  void gravity() {
    //speedy += 0.15;

    speed.addSelf(grav);
  }

  void lineBetween() {
    //ballCollection
    for (int i=0; i<ballCollection.size();i++) {
      Ball other = (Ball) ballCollection.get(i);
      float distance = loc.distanceTo(other.loc);
      if (distance > 0 && distance < 80) {
        stroke(255, 0, 255);
        strokeWeight(0.2);
        line(loc.x, loc.y, other.loc.x, other.loc.y);
      }
    }
  }

  void flock() {
    separate();
    // cohesion();
    // align();
  }

  void separate(float magnitude) {
    Vec3D steer = new Vec3D();
    int count = 0;

    for (int i=0; i<ballCollection.size();i++) {
      Ball other = (Ball) ballCollection.get(i);
      float distance = loc.distanceTo(other.loc);
      if (distance > 0 && distance < 40) {

        Vec3D diff = loc.sub(other.loc);
        diff.normalizeTo(1.0/distance);

        steer.addSelf(diff);
         count++;
      }
    }
  }

  if (count>0) {
    steer.scaleSelf(1.0/count);
  }

  steer.scaleSelf(magnitude);
  acc.addSelf(steer);
}

错误消息突出显示行106;

if (count>0) {

我在另一台机器上重新创建了该错误,但在教程视频中看到的代码没有任何问题。非常感谢您的任何帮助:)