Java:Sorting an array

//This program will take some random values and sort them in ascending order

import static java.lang.Math.abs;
import java.util.*;

public class SortingAnArray {

    public static void main(String[] args) {

        Scanner obj=new Scanner(System.in);
        int n;
        n=obj.nextInt();
        int a[]=new int[n];
        Random ob=new Random();
        for(int i=0;i<n;i++)
        {
            a[i]=ob.nextInt()%9;
            if(a[i]<0)
                a[i]=abs(a[i]);
        }
        System.out.println("Elements before sorting");
        for(int i:a)
        {
            System.out.printf("%d ",i);
        }
        System.out.println();
        Arrays.sort(a);
        System.out.println("Elements after sorting");
        for(int i:a)
        {
            System.out.printf("%d ",i);
        }
        System.out.println();
    }
   
}