ZCW-DiceyLab/src/main/java/Simulation.java

public class Simulation {

    int numOfDice, numOfTosses;
    Dice dice;
    Bins bin;

    Simulation(int numDice, int numToss){
        this.numOfDice = numDice;
        this.numOfTosses = numToss;
        dice = new Dice(numDice);
        bin = new Bins(numDice);
    }

    public int getRoll(){ return dice.tossSum(); }

    public void simulate(){
        for(int i = 0; i< this.numOfTosses; i++){
            bin.incrementBin(getRoll());
        }
    }

    public double toPercent(int diceVal){
        double result = (double)bin.binResults.get(diceVal)/this.numOfTosses;
        return result;
    }

    public String getStars(double percent) {
        String output = new String();
        int numOfStars = (int)(percent*100);
        for(int i = 0; i < numOfStars; i++){
            output += "*";
        }
        return output;
    }

    public void printResults(){
        System.out.println("***********************************************");
        System.out.println("Simulation of " + this.numOfDice + " dice tossed for " + this.numOfTosses + " times.");
        System.out.println("***********************************************\n");
        for(Integer num : bin.binResults.keySet()) {
            String output = String.format("%3d : %9d -> %6.2f %-5s", num, bin.binResults.get(num),
                    toPercent(num), getStars(toPercent(num)));
            System.out.println(output);
        }
    }
}