Question

I created this program using the Java-oriented programming application known as Eclipse for a lottery system, however it's not giving me the output I want. The output should look something like this:

Trial Sum Count of Occurrence

3 150

4 170

5 1100

6 1460

...

83 240

84 90

Any help with the following program would be appreciated

/* Simulate a Pick 3 lottery system and conduct 100,000 independent lottery trials* reporting out aggregate statistical data based on your results. The lottery pool consists of numbers 0-29* (with no duplicates occurring in any given trial). You must use ArrayList to solve this problem.*/

importjava.util.ArrayList;

importjava.util.Random;

public class Lottery

{

Random rando;

ArrayList pool;

ArrayList storage;

ArrayList countholder;

ArrayList neostorage;

publicLottery()

{

neostorage= newArrayList<>();

countholder= newArrayList<>();

storage= newArrayList<>();

pool= newArrayList<>();

for(int i=0; i<30; i++)

{

pool.add(i);

}

rando= newRandom();

}

public void run Lottery()

{

int counter= 0;

int sum= 0;

boolean same= true;

for(int i=0; i<1000; i++)

{

int store1= rando.nextInt(pool.size()-1);

int store2= rando.nextInt(pool.size()-1);

int store3= rando.nextInt(pool.size()-1);

while(same)

{

if(store1== store2|| store2== store3|| store1== store3)

{

store1= rando.nextInt(pool.size()-1);

store2= rando.nextInt(pool.size()-1);

store3= rando.nextInt(pool.size()-1);

}

else

{

same= false;

}

}

same=true;

while(same)

{

if(sum<3 && sum>84)

{

store1= rando.nextInt(pool.size()-1);

store2= rando.nextInt(pool.size()-1);

store3= rando.nextInt(pool.size()-1);

}

else

{

same= false;

}

}

sum= store1+store2+store3;

storage.add(sum);

for(int k= 0; k

{

counter= 1;for(int j= k; j

{

if(storage.get(j) == storage.get(k))

{

counter++;

}

}

countholder.add(counter);

neostorage.add(storage.get(k));

}

}

System.out.println("Trial Sum Count of Occurences ");

for(int i= 0; i

{

System.out.println(neostorage.get(i) + " "+ countholder.get(i));

}

}

public static void main (String[] args)

{

Lottery lot= newLottery();

lot.runLottery();

}

}

Answer 1

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;

public class Lottery {

        private Random rando;

        private int maxElement;
        private int numExperiments;

        public Lottery() {
                maxElement = 29;
                numExperiments = 100000;
                rando = new Random();
        }

        public void runLottery() {
                boolean same = true;
                
                HashMap<Integer, Integer> sumCounts = new HashMap<>();

                for (int i = 0; i < numExperiments; i++) {
                        same = true;
                        int store1=0, store2=0, store3=0;
                        while (same) {
                                if (store1 == store2 || store2 == store3 || store1 == store3) {
                                        store1 = rando.nextInt(maxElement + 1);
                                        store2 = rando.nextInt(maxElement + 1);
                                        store3 = rando.nextInt(maxElement + 1);
                                } else {
                                        same = false;
                                }
                        }

                        int sum = store1 + store2 + store3;

                        sumCounts.put(sum, 1 + sumCounts.getOrDefault(sum, 0));
                }

                // now print the counts of each sum.
                System.out.printf("%-20s%-20s\n", "Trial Sum", "Count of Occurrence");
                for (int sum = 3; sum <= 84; sum++) {
                        if (sumCounts.containsKey(sum)) {
                                System.out.printf("%-20d%-20d\n", sum, sumCounts.get(sum));
                        }
                }

        }

        public static void main(String[] args)  {
                Lottery lot = new Lottery();
                lot.runLottery();

        }

}

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