Review

class CMAESOptimizer {
    /**
     * Pushes the current best fitness value in a history queue.
     *
     * @param vals History queue.
     * @param val Current best fitness value.
     */
    private static void push(double[] vals, double val) {
        for (int i = vals.length-1; i > 0; i--) {
            vals[i] = vals[i-1];
        }
        vals[0] = val;
    }

}