[Java] CH6 Fibonacci Number Calculator

/**
    the fibonacci sequence is defined by the following rule. the first two values in the sequence are 1 and 1. Every subsequent value is the sum of the two values preceding it. For example, the third value is 1 + 1 = 2, the fourth value is 1+2=3, and the fifth is 2+3 =5. If fn denotes the n the value in the fibonacci sequence, then
    f1 = 1
    f2 = 1
    fn = fn-1 + f2-2 if n > 2
    write a programing that prompts the user for n and prints the first n values in the fibonacciGenerator with a methof nextNumber.
Hint: there is no need to store all values for fn you only need the last two values to compute the next one in the series:
    fold1 = 1;
    fold2 = 1;
    fnew = fold1 + fold2
    after that, discard fold2,which is no longer needed, and set fold2 to fold1 and fold1 to fnew.
    your generator class will be tested with this runner program:
 
    public class FibonacciRunner
    {
        public static void main(String[] srgs)
        {
            Scanner in = new Scanner(System.in);
            System.out.println("Enter n : ");
            int n = in.nextInt();
            fibonacciGenerator fg = fibonacciGenerator();
 
            for(int i = 1; i<= n; i++)
                System.out.println(fg.nextNumber());
        }
    }
*/
import java.util.Scanner;                
 
public class Fib
{
 
    public static int fold1;
    public static int fold2;
    public static int fnew;
 
    public Fib()
    {
        fold1 = 0;
        fold2 = 1;
    }
 
    public static int nextNumber()
    {
        fnew = fold1 + fold2;
        return fnew;
    }    
 
    public static void deleteNumber()
    {
        fold1 = fold2;
        fold2 = fnew;
    }
 
    public static void main(String[] srgs)
    {
        Fib fb = new Fib();
        Scanner in = new Scanner(System.in);
        System.out.println("Enter n : ");
        int n = in.nextInt();
        System.out.println("*** Fibonacci Numbers ***");
        for(int i = 1; i<= n; i++)
        {   
            int nextNum = nextNumber();
            System.out.println(nextNum);
            deleteNumber();
        }
 
    }
}