Fill function in an array of objects

In you Ball class add in :

public class Ball {
   color ballFill;

   Ball (color bF) {
      ballFill = bF;
   }

   void display() {
      fill(ballFill);
   }
}

// and when creating a Ball
balls[i] = new Ball(random(0.1, 5), 0, 0, color(random(255), random(255), random(255));
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