How to output using Arrays.sort

Question

I'm trying to print 10,000 random numbers in ascending and descending order using Arrays.sort then output it. If I try it as this, it does not give the right output.

import java.util.*;
import java.util.Random;

public class QuestionFour 
{
    public static void main(String[] args) 
    {
        int arr[] = new int[10000];
        Random rand = new Random();

        for (int i=0; i<10000; i++)
        {
            arr[i] = rand.nextInt( 100 ) + 1;
            Arrays.sort(arr);
            System.out.println(arr);
        }
    }

}

Answer 1

Arrays.sort() does not have anything related with output, it only sorts an array

Let your loop fill the array, and after that sort and print it with Arrays.toString()

int arr[] = new int[10000];
Random rand = new Random();

for (int i=0; i<10000; i++){
    arr[i] = rand.nextInt( 100 ) + 1;
}
Arrays.sort(arr);
System.out.println(Arrays.toString(arr));

---

Reverse order sort :

1. You could use Arrays.sort(arr, Comparator.reverseOrder());, but this requires an array of objects, it would requires a Integer arr[] = new Integer[10000]; rather than int

2. Use a List<Integer> instead of en array, it would be easier to manipulate

   List<Integer> list = new ArrayList<>();
   Random rand = new Random();
   for (int i = 0; i < 10000; i++) {
       list.add(rand.nextInt(100) + 1);
   }
   list.sort(Comparator.reverseOrder());
   System.out.println(list);             //[100, 100, 100, 100, 100, 100, 100, 100 ... 
   

Answer 2

you need to put Arrays.sort(arr); outside your for loop and create another loop for printing the array after it had been sorted. your code should be as follows :

import java.util.*;
import java.util.Random;

public class QuestionFour 
{
    public static void main(String[] args) 
    {
        int arr[] = new int[10000];
        Random rand = new Random();

        for (int i=0; i<10000; i++)
        {
            arr[i] = rand.nextInt( 100 ) + 1;

        }

        Arrays.sort(arr);

        for (int i = 0; i < arr.length; i++) {

            System.out.println(arr[i]);
        }
    }

}