Java, Simulation, Programming, Science, Coding.
has changed its velocity and direction. public Event(double t, Particle a, Particle b) { time = t; this.a = a; this.b = b; if (a != null) countA = a.count(); else countA = -1; if (b != null) countB = b.count(); else countB = -1; } Initially, we maintain a collision count in two different variables