Probabilistic choice

Given a mapping between items and their required probability of occurrence, generate a million items randomly subject to the given probabilities and compare the target probability of occurrence versus the generated values.

The total of all the probabilities should equal one. (Because floating point arithmetic is involved this is subject to rounding errors).

package NonUnitTest;

class Probabilistic {
    static long TRIALS = 1000000;
    static Expv[] items =
            { new Expv("aleph", 0, 0.0, 0.0), new Expv("beth", 0, 0.0, 0.0),
              new Expv("gimel", 0, 0.0, 0.0),
              new Expv("daleth", 0, 0.0, 0.0), new Expv("he", 0, 0.0, 0.0),
              new Expv("waw", 0, 0.0, 0.0),
              new Expv("zayin", 0, 0.0, 0.0), new Expv("heth", 0, 0.0, 0.0) };

    //~--- METHODS 

    public static void main(String[] args) {
        int i, j;
        double rnum,
                tsum = 0.0;

        for (i = 0, rnum = 5.0; i < 7; i++, rnum += 1.0) {
            items[i].expect = 1.0 / rnum;
            tsum += items[i].expect;
        }

        items[7].expect = 1.0 - tsum;
        items[0].mapping = 1.0 / 5.0;

        for (i = 1; i < 7; i++) {
            items[i].mapping = items[i - 1].mapping + 1.0 / ((double) i + 5.0);
        }

        items[7].mapping = 1.0;

        for (i = 0; i < TRIALS; i++) {
            rnum = Math.random();

            for (j = 0; j < 8; j++) {
                if (rnum < items[j].mapping) {
                    items[j].probcount++;

                    break;
                }
            }
        }

        System.out.printf("Trials: %d\n", TRIALS);
        System.out.printf("Items:          ");

        for (i = 0; i < 8; i++) {
            System.out.printf("%-8s ", items[i].name);
        }

        System.out.printf("\nTarget prob.:   ");

        for (i = 0; i < 8; i++) {
            System.out.printf("%8.6f ", items[i].expect);
        }

        System.out.printf("\nAttained prob.: ");

        for (i = 0; i < 8; i++) {
            System.out.printf("%8.6f ",
                              (double) (items[i].probcount) / (double) TRIALS);
        }

        System.out.printf("\n");
    }

    //~--- INNER CLASSES 

    private static class Expv {
        public double expect;
        public double mapping;
        public String name;
        public int probcount;

        //~--- CONSTRUCTORS 

        public Expv(String name, int probcount, double expect, double mapping) {
            this.name = name;
            this.probcount = probcount;
            this.expect = expect;
            this.mapping = mapping;
        }
    }
}