java/examples/Topics/Simulate/Flocking/applet/Flock.pde

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+// The Flock (a list of Boid objects)
+
+class Flock {
+  ArrayList boids; // An arraylist for all the boids
+
+  Flock() {
+    boids = new ArrayList(); // Initialize the arraylist
+  }
+
+  void run() {
+    for (int i = 0; i < boids.size(); i++) {
+      Boid b = (Boid) boids.get(i);  
+      b.run(boids);  // Passing the entire list of boids to each boid individually
+    }
+  }
+
+  void addBoid(Boid b) {
+    boids.add(b);
+  }
+
+}
+