Alternate Number differences in Java

package sda;
import java.util.*;
public class AlterNateSumDiff {
	public static void main(String[] args) {
	Scanner sc=new Scanner(System.in);
	int no=sc.nextInt();
	int arr[]=new int[no];
	int diff=0,sum=0;
		for(int i=0;i<no;i++) {
			arr[i]=sc.nextInt();
		}
		for(int i=0;i<no/2;i++) {
			diff=arr[i]-arr[no-i-1];
			sum+=diff;
		}
	System.out.println(sum);
	}
}