java code to print alternate prime numbers in reverse order

Question

The following is my java code to print 'n' prime no.s but i want to modify it such that i can print alternate prime numbers in reverse order.

import java.util.Scanner;

class PrimeNumberDemo
{
   public static void main(String args[])
   {
      int n;
      int status = 1;
      int num = 3;
      //For capturing the value of n
      Scanner scanner = new Scanner(System.in);
      System.out.println("Enter the value of n:");
      //The entered value is stored in the var n
      n = scanner.nextInt();
      if (n >= 1)
      {
         System.out.println("First "+n+" prime numbers are:");
         //2 is a known prime number
         System.out.println(2);
      }

      for ( int i = 2 ; i <=n ;  )
      {
         for ( int j = 2 ; j <= Math.sqrt(num) ; j++ )
         {
            if ( num%j == 0 )
            {
               status = 0;
               break;
            }
         }
         if ( status != 0 )
         {
            System.out.println(num);
            i++;
         }
         status = 1;
         num++;
      }         
   }
}

Answer 1

As per your code I have made some modification and below is how I achieve Alternate Prime numbers in reverse order

public static void main(String args[])
   {
      int n;
      int status = 1;
      int num = 3;
      List<Integer> primeNumberList=new ArrayList<Integer>();
      //For capturing the value of n
      Scanner scanner = new Scanner(System.in);
      System.out.println("Enter the value of n:");
      //The entered value is stored in the var n
      n = scanner.nextInt();
      if (n >= 1)
      {
         System.out.println("First "+n+" prime numbers are:");
         //2 is a known prime number
         System.out.println(2);
         primeNumberList.add(2);
      }

  for ( int i = 2 ; i <=n ;  )
  {
     for ( int j = 2 ; j <= Math.sqrt(num) ; j++ )
     {
        if ( num%j == 0 )
        {
           status = 0;
           break;
        }
     }
     if ( status != 0 )
     {
        System.out.println(num);
        primeNumberList.add(num);
        i++;
     }
     status = 1;
     num++;
  }

  //reversing collection 
  Collections.reverse(primeNumberList);
   System.out.println("\n");
  System.out.println("Alternate Prime numbers in reverse order \n");
  for(int k=0;k<primeNumberList.size();k++){
     if((k%2)==0)
          System.out.println(""+primeNumberList.get(k));
  }

}

Result Output

Enter the value of n:
10
First 10 prime numbers are:
2
3
5
7
11
13
17
19
23
29


Alternate Prime numbers in reverse order 

29
19
13
7
3