Fibonacci generator and gives the number back as output

I have a program that i need to complete. I wrote the first one (FibonacciGenerator) with stated variables - everything worked fine
I now want to split it up so that the user can give a number and the program gives the correct number back. (ie, fib(5)=5 AND NOT fib(5)=2)
Please help as I know what i need to do but the how escapes me.

constructor portion

Code :

  /*
   Class used to generate a Fibonacci number with a given input
*/
    public class FibonacciGenerator
   {
   /**
      Construct a FibonacciGenerator object to
         generate a Fibonacci number
   */
       public FibonacciGenerator()
      {
         initialize();
      }
 
   	/**
   	Initializes the FibonacciGenerator object. Allows
   	the object to be reset and reused.
   	*/   	
 
       public void initialize()
      {
         fold1 = 1;
         fold2 = 1;
         fnew = 1;
         count = 0;
      }   
   /**
      Method used to calculate a fibonacci number
      @return fnew the fibonacci number
   */
       public int nextNumber()
      {
         if(count < 2)
         {
            count++;
            return 1;
         }
         else
         {
           	fnew = fold1 + fold2;
 
            fold2 = fold1;
            fold1 = fnew;
 
            return fnew;
         }
      }
 
      private int fold1;
      private int fold2;
      private int count;
      private int fnew;
   }

Test Program (I know i need to return the input to the constructor file but how??)

Code :

  import javax.swing.JOptionPane;
 
/**
   Test driver class for FibonacciGenerator class
*/
public class FibonacciGeneratorTester
{
   public static void main(String[] args)
   {
      String input = JOptionPane.showInputDialog(
         "Enter a Number or hit ''Cancel'' to exit:");
      int n = Integer.parseInt(input);
 
      FibonacciGenerator fg = new FibonacciGenerator();
 
      int next = n;
 
      if (n < 2)
         next = 1;
      else
      {
         for (int i = 3; i <= n; i++)
         {
            next = fg.nextNumber();
         }
      }
 
      System.out.println("fib(" + n + ") = " + next);
 
      System.exit(0);
   }
}

Any help is appreciated