public class DiceTally {

    int minimum;
    int numberOfDice = 2;
    int numberOfSides = 6;
    int minimumRoll = numberOfDice;
    int numberofCombinations = numberOfDice * numberOfSides - minimumRoll + 1;
    int[] tallies = new int[numberofCombinations];

    public DiceTally(int min) {
        minimum = min;
    }

    public void tallyAndReport() {
        clearTallies();
        doTallies();
        doReport();
    }

    private void clearTallies() {
        for (int i = 0; i < numberofCombinations; ++i) {
            tallies[i] = 0;
        }
    }

    private void doTallies() {
        while (!isDoneTallying()) {
            doTally();
        }
    }

    private boolean isDoneTallying() {
        return getMinimumTally() >= minimum;
    }

    private int getMinimumTally() {
        int min = Integer.MAX_VALUE;
        for (int i = 0; i < numberofCombinations; ++i) {
            min = Math.min(min, tallies[i]);
        }
        return min;
    }

    private void doTally() {
        incrementTally(convertDiceRollToIndex(rollDice()));
    }

    private int rollDice() {
        int sum = 0;
        for (int i = 0; i < numberOfDice; ++i) {
            sum += rollDie();
        }
        return sum;
    }

    private int rollDie() {
        return 1 + (int) (Math.random() * numberOfSides);
    }

    private int convertDiceRollToIndex(int roll) {
        return roll - minimumRoll;
    }

    private void incrementTally(int tally) {
        tallies[tally]++;
    }

    private void doReport() {
        for (int i = 0; i < numberofCombinations; ++i) {
            reportCombination(i);
        }
    }

    private void reportCombination(int n) {
        System.out.println(n + minimumRoll + " " + tallies[n]);
    }
}