Casting Array vs Normal Array

import java.util.Random;

public class JustATest {

    private class None {
        int someNumber;
        None (int someNumber) {
            this.someNumber=someNumber;
        }
        int get() {
            return someNumber;
        }
        None modify() {
            //here normally happens something
            return this;
        }
    }

    int n;
    int sqrtn;
    Random R = new Random();
    None[] normalArray;
    Object[] castingArray;

    JustATest(int n) {
        this.n=n;
        this.sqrtn=(int)Math.sqrt(n);
        normalArray=new None[n];
        castingArray=new None[n];
        for (int i=0; i<n; i++) {
            None N = new None(R.nextInt(1000));
            normalArray[i]=N;
            castingArray[i]=N;
        }
    }

    public int test1(int j) {
        int counter=0;
        None backup = (None)castingArray[j];
        for (int i=n-1; i>=j; i--) castingArray[i]=((None)castingArray[i-j]).modify();
        for (int i=j-1; i>0; i--) castingArray[i]=((None)castingArray[n+i-j]).modify();
        castingArray[0]=backup.modify();
        for (int i=0; i<sqrtn; i++) {
            if (((None)castingArray[i]).get()==((None)castingArray[i*i]).get()) counter++;
        }
        return counter;
    }

    public int test2(int j) {
        int counter=0;
        None backup = normalArray[j];
        for (int i=n-1; i>=j; i--) normalArray[i]=normalArray[i-j];
        for (int i=j-1; i>0; i--) normalArray[i]=normalArray[n+i-j];
        normalArray[0]=backup;
        for (int i=0; i<sqrtn; i++) {
            if (normalArray[i].get()==normalArray[i*i].get()) counter++;
        }
        return counter;
    }


    public static void main(String[] args) {
        int n = 30000;
        JustATest J = new JustATest(n);
        long totalCounter1=0;
        long totalCounter2=0;
        long a = System.currentTimeMillis();
        for (int i=0; i<n; i++) totalCounter1+=J.test1(i);
        long b = System.currentTimeMillis();
        for (int i=0; i<n; i++) totalCounter2+=J.test2(i);
        long c = System.currentTimeMillis();
        System.out.println("Normal array: "+(c-b)+" ms");
        System.out.println("With casting: "+(b-a)+" ms");
        System.out.println("Desired result: "+totalCounter1+" = "+totalCounter2+".");
    }
}