Randomize and shuffle array of numbers in Java

import java.util.Arrays;
import java.util.Random;
public class Demo {
	public static void main(String[] args) {
		int[] arr = { 20, 40, 60, 80,100, 120, 140, 160, 180, 200};
		System.out.println("The integer array = "+Arrays.toString(arr));
		Random rand = new Random();
		for(int i = 0; i<arr.length; ++i) {
			int index = rand.nextInt(arr.length - i);
			int tmp = arr[arr.length - 1 - i];
			arr[arr.length - 1 - i] = arr[index];
			arr[index] = tmp;
		}
		System.out.println("Shuffle integer array = "+Arrays.toString(arr));
	}
}