Exercise Set 1, question 4

/** Constructs a fish at the specified location in a given environment.
 *  The Fish is assigned a random direction, random color, a constant
 *  probability of breeding, and a constant probability of dying.
 *  (Precondition: parameters are non-null; <code>loc</code> is valid
 *  for <code>env</code>.)
 *  @param env	environment in which fish will live
 *  @param loc	location of the new fish in <code>env</code>
 **/
public Fish(Environment env, Location loc)
{
  initialize(env, loc, env.randomDirection(),
               randomColor(), 1.0/7.0, 1.0/5.0);
}