To develop a java program to print's that call by address

import java.util.Scanner;

public class reference
{
   public static void main(String args[])
   {
     int number;
     Scanner sayed=new Scanner(System.in);
     //printing before update
     System.out.println("Number:");
     number=sayed.nextInt();
     System.out.println("\nBefore update number:"+number);
     // update funcation return
     number=update (number);
     System.out.println("\nAfter update number:"+number);
   }
   public static int update (int number)
   {
     number=number+2;
     return number;
   }
}