Thread: Java Nest Loop ( Dice Stimulation)

I'm currently creating a Dice Roll stimulation with nest loop, but my code seem kind of long, any idea on how I can shorten it?

import java.util.Random;
import java.util.Scanner;
public class DiceProbability
{
    public static void main(String[] args)
    {
        //Declare and initialize variables and objects
        Scanner inRoll = new Scanner(System.in);
        Random randNum = new Random();
 
        int match = 0; //Number of times sum of dice matches the current sum
        int die1, die2; //Random generated numbers
        int nRoll ;
        int nSides = 11;
 
        int totalCount = 0;
        int count2 = 0;
        int count3 = 0;
        int count4 = 0;
        int count5 = 0;
        int count6 = 0;
        int count7 = 0;
        int count8 = 0;
        int count9 = 0;
        int count10 = 0;
        int count11= 0;
        int count12= 0;
        int count13 = 0;
        int count14 = 0;
        int count15 = 0;
        int count16 = 0;
        int count17 = 0;
        int count18 = 0;
        int count19 = 0;
        int count20 = 0;
        int count21 = 0;
        int count22 = 0;
 
 
 
        //Input: ask user for number of rolls and number of sides on a die
        System.out.println("Enter the number of rolls: ");
        nRoll = inRoll.nextInt();
 
 
        //Print heading for output table
        System.out.println("Number of rolls: "+ nRoll);
 
        //***************************************************************************************
        //Using nested loops, cycle through the possible sums of the dice.
        //Roll the dice the given number of times for each sum.
        //Count how many times the sum of the dice match the current sum being looked for.
        //***************************************************************************************
 
        //Loop to increment through the possible sums of the dice 
        for(int sum = 2; sum <=2*nSides;sum++)
        {
            for(int roll = 0; roll < nRoll;roll++)
            {
                Random randNumList= new Random();
                int randNum1 = randNumList.nextInt(nSides)+1;
                int randNum2 = randNumList.nextInt(nSides)+1;
                int sumOf = randNum1 + randNum2;
 
                {totalCount++;
                if(randNum1 + randNum2 == 2)
                count2++;
                else if(sumOf ==3)
                count3++;
                else if(sumOf ==4)
                count4++;
                else if(sumOf ==5)
                count5++;
                else if(sumOf ==6)
                count6++;
                else if(sumOf ==7)
                count7++;
                else if(sumOf ==8)
                count8++;
                else if(sumOf ==9)
                count9++;
                else if(sumOf ==10)
                count10++;
                else if(sumOf ==11)
                count11++;
                else if(sumOf ==12)
                count12++;
                else if(sumOf ==13)
                count13++;
                else if(sumOf ==14)
                count14++;
                else if(sumOf ==15)
                count15++;
                else if(sumOf==16)
                count16++;
                else if(sumOf ==17)
                count17++;
                else if(sumOf ==18)
                count18++;
                else if(sumOf ==19)
                count19++;
                else if(sumOf ==20)
                count20++;
                else if(sumOf ==21)
                count21++;
                else
                count22++;
            }
            }
 
        }
 
        System.out.println("Sum of Dice:"+ "\t Probability");
        System.out.println("2s:"+ " \t\t"+((double)count2/totalCount)*100+" %");
        System.out.println("3s:"+ " \t\t"+((double)count3/totalCount)*100+" %");
        System.out.println("4s:"+ " \t\t"+((double)count4/totalCount)*100+" %");
        System.out.println("5s:"+ " \t\t"+((double)count5/totalCount)*100+" %");
        System.out.println("6s:"+ " \t\t"+((double)count6/totalCount)*100+" %");
        System.out.println("7s:"+ " \t\t"+((double)count7/totalCount)*100+" %");
        System.out.println("8s:"+ " \t\t"+((double)count8/totalCount)*100+" %");
        System.out.println("9s:"+ " \t\t"+((double)count9/totalCount)*100+" %");
        System.out.println("10s:"+ " \t\t"+((double)count10/totalCount)*100+" %");
        System.out.println("11:"+ " \t\t"+((double)count11/totalCount)*100+" %");
        System.out.println("12:"+ " \t\t"+((double)count12/totalCount)*100+" %");
        System.out.println("13:"+ " \t\t"+((double)count13/totalCount)*100+" %");
        System.out.println("14:"+ " \t\t"+((double)count14/totalCount)*100+" %");
        System.out.println("15:"+ " \t\t"+((double)count15/totalCount)*100+" %");
        System.out.println("16:"+ " \t\t"+((double)count16/totalCount)*100+" %");
        System.out.println("17:"+ " \t\t"+((double)count17/totalCount)*100+" %");
        System.out.println("18:"+ " \t\t"+((double)count18/totalCount)*100+" %");
        System.out.println("19:"+ " \t\t"+((double)count19/totalCount)*100+" %");
        System.out.println("20:"+ " \t\t"+((double)count20/totalCount)*100+" %");
        System.out.println("21:"+ " \t\t"+((double)count21/totalCount)*100+" %");
        System.out.println("22:"+ " \t\t"+((double)count22/totalCount)*100+" %");

Quick answer #1: use an array of ints rather than 22+ int variables. Then you can loop through the array with ease should you desire.

Oh I forgot to include that I can't use array Thanks though!

Originally Posted by maple1100

Oh I forgot to include that I can't use array Thanks though!

Well if you can't use other collections such as an ArrayList, I think that you're stuck with what you have. Bummer.

Thank you . Also, looking at my code, if I wanted to do the number of sides base on the user input instead of 11, do you think there any way I can compare the sum of any given side then have a count on that? For example let say it I roll the dice and get 30 and 30 which would give me a sum of 60. In the code you see that I hardcore the if/else if to compare it to a number from 2-22 ( Because I hardcore in 11 sides so the max number of sum is 22). ** Sorry if question is unclear.

First time helping, here we go!

Arrays:
Arrays (The Java™ Tutorials > Learning the Java Language > Language Basics)
ArrayLists:
10 example of using ArrayList in Java >>> Java ArrayList Tutorial

That's all I can help you with, arrays are really simple and so are arraylists. Try them out!

/Adzox