在處理中加上大括號時出現問題

Question

當我運行它時，我的代碼返回一個錯誤，告訴我「有太多的{字符沒有}來匹配它」，但我已經檢查並重新檢查，重新檢查，甚至有別人檢查我，無濟於事。

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); 
} 

該錯誤消息突出線106;

if (count>0) { 

我在另一臺機器上重新創建了錯誤，但看到了教程視頻中使用的代碼沒有任何問題。任何和所有的幫助將不勝感激:)

Answer 1

count變量是局部變量，但是，您已經在函數之外使用了它。 steer和acc也相同。如下更新它;

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); 
    } 

Answer 2

我認爲你的問題是在103行，還有一個}。 if（count> 0）行在方法之外。

Answer 3

如果你使用一個想法，你可以很容易找到的編譯錯誤，如果（計數> 0），超出的方法，看來你錯此語句前加上一個「}」。

Answer 4

你已經完成了很好的縮進，所以你的大括號的位置是正確的（你可能使用過編輯，自動格式）。我建議我的編程的學生，他們發表評論「結束」大括號，以防止此類問題：

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++; 
    } // end if distance 
    } // end for 
} // end separate method