Question

objective: create methods that receive arrays as arguments. Problem Statement: Roll a 6-side die a user specified number of times and keep track of the number of times each value appears. Simulate rolling the die by generating a random number in the range of 1 to 6. After rolling the die the needed number of rolls, display a histogram of the distribution of roll values See the sample output below How many times o you want to ro the die Max value s 1 00 TRY AGAIN! Hou many times do you want to roll the die? [Max value is 100] 15 Let's get rolling The number of 1's 4 The number of 2's The number of 3's The number of 4 The number of 5's: 4 The number of 6's: 2 To begin, create a new project called Lab9-RollDie'. Download and add the Roll Diejava starter code provided on Blackboard.

the RollDie.java:

import java.util.Random;
import java.util.Scanner;

/*
 *   HEADER HERE !!
 */
public class RollDie {

        public static void main(String[] args) {
                
                Scanner scnr = new Scanner(System.in);
                
                // Step 1: Declare and initialize array and 
                //   initialize random number generator
                int[] rollValueCounts = new int[7]; 
                Random randGen = new Random();

        
                // Step 2: Determine the number of rolls 
                System.out.print("How many times do you want to roll the die?");
                System.out.print(" [Max value is 100] ");
                int numRolls = scnr.nextInt();
                // TODO: Check that user provided value is valid 
                //  (i.e., in the range 0-100) and if not reprompt
                
                System.out.println("Let's get rolling...");
                
                // Step 3: Generate numRolls random values between 1-6
                for(int i = 0; i < numRolls; i++) {
                        int rollValue = randGen.nextInt(6) + 1;
                        /* The rollValue will serve as the index and at that
                           location in the array we will keep the number of rolls 
                           for that value. 
                         */
                        rollValueCounts[rollValue]++;
                }
                
                // TODO:
                // Step 4: Display the roll counts as a histogram
                
                //printTable(rollValueCounts);
                
        }
        
        // FOR LAB, CREATE A NEW METHOD TO DISPLAY THE ROLL COUNTS
        //  AS A HISTOGRAM.  BE SURE TO STATE STEPS IN THE METHOD AND
        //  PROVIDE A HEADER
        
        
        /**************************************************************************
         * printTable - Prints the contents of an integer array as a table
         * 
         * int[] data - The data to be displayed on the screen
         */
        public static void printTable(int[] data) {
                


                for(int i = 0; i < data.length + 1; i++) {
                           System.out.print("-----");
                }
                System.out.print("\nIndex");
                for(int i = 0; i < data.length; i++) {
                        System.out.printf("|%4d", i);
                }
                System.out.print("\nValue");
                for(int i = 0; i < data.length; i++) {
                        System.out.printf("|%4d", data[i]);
                }
                System.out.println();
                for(int i = 0; i < data.length+1; i++) {
                        System.out.print("-----");
                }
        }

}

Answer 1

package com.company;
import java.util.Random;
import java.util.Scanner;

/*
 *   HEADER HERE !!
 */
public class RollDie {

    public static void main(String[] args) {

        Scanner scnr = new Scanner(System.in);

        // Step 1: Declare and initialize array and
        //   initialize random number generator
        int[] rollValueCounts = new int[7];
        Random randGen = new Random();
        int numRolls;
        // Step 2: Determine the number of rolls

 //  (in the range 0-100) and if not reprompt

        while(true) {
            System.out.print("How many times do you want to roll the die?");
            System.out.print(" [Max value is 100] ");
             numRolls = scnr.nextInt();
            if(numRolls>100)
                System.out.println("Try Again!");
            else
                break;
        }

          

            System.out.println("Let's get rolling...");

            // Step 3: Generate numRolls random values between 1-6
            for (int i = 0; i < numRolls; i++) {
                int rollValue = randGen.nextInt(6) + 1;
                        /* The rollValue will serve as the index and at that
                           location in the array we will keep the number of rolls
                           for that value.
                         */
                rollValueCounts[rollValue]++;


            }

           
            // Step 4: Display the roll counts as a histogram

            printTable(rollValueCounts);
        }


    /**************************************************************************
     * printTable - Display the roll counts as a histogram

     *
     * int[] data - The data to be displayed on the screen
     */

    public static void printTable(int[] data) {


        System.out.print("The number of 0's :" +data[0]);
        for (int i = 0; i <data[0] ; i++) {

            System.out.print(" *");
        }
        System.out.println();
System.out.print("The number of 1's :" +data[1]);
        for (int i = 0; i <data[1] ; i++) {

            System.out.print(" *");
        }
        System.out.println();
        System.out.print("The number of 2's :" +data[2] );
        for (int i = 0; i <data[2] ; i++) {

            System.out.print(" *");
        }
        System.out.println();
        System.out.print("The number of 3's :" +data[3] );
        for (int i = 0; i <data[3] ; i++) {

            System.out.print(" *");
        }
        System.out.println();
        System.out.print("The number of 4's :" +data[4] );
        for (int i = 0; i <data[4] ; i++) {

            System.out.print(" *");
        }
        System.out.println();
        System.out.print("The number of 5's :" +data[5]);
        for (int i = 0; i <data[5] ; i++) {

            System.out.print(" *");
        }
        System.out.println();
        System.out.print("The number of 6's :" +data[6] );
        for (int i = 0; i <data[6] ; i++) {

            System.out.print(" *");
        }
        System.out.println();
    }
}

output:-->

How many times do you want to roll the die? [Max value is 100] 200 Try Again! How many times do you want to roll the die? [Max value is 100] 150 Try Agair! How many times do you want to roll the die? [Max value is 100] 15 Let's get rolling... The number of O's:0 The number of 1's:0 The number of 2's:4**** The number of 3's:3*** The number of 4's:2* * The number of 5's :5** The number of 6's:1* Process finished with exit code 0