reverse an array without using another array in java

1// Reverse an array without using another array in java
2import java.util.Scanner;
3public class ReverseWithoutArray 
4{
5      public static void main(String[] args) 
6      {
7         int number, temp, a;
8         Scanner sc = new Scanner(System.in);
9         System.out.print("Please enter number of elements in the array: ");
10         number = sc.nextInt();
11         int[] arrayNumbers = new int[number];
12         System.out.println("Please enter " + number + " number elements.");
13         for(a = 0; a < number; a++)
14         {
15             arrayNumbers[a] = sc.nextInt();
16         }
17         for(a = 0; a < number; a++, number--)
18         {
19             temp = arrayNumbers[a];
20             arrayNumbers[a] = arrayNumbers[number - 1];
21             arrayNumbers[number - 1] = temp;
22         }
23         System.out.println("Reverse of an array is : ");
24         for(a = 0; a < arrayNumbers.length; a++)
25         {
26             System.out.println(arrayNumbers[a]);
27         }
28         sc.close();
29      }
30}