import java.util.Scanner;

public class Test{
	
	public static void main (String[]args){
		Scanner in=new Scanner(System.in);
		//System.out.println("Inserisci l'n-mo numero di Fibonacci che vuoi calcolare\nn= ");
		System.out.println("Witch Fibonacci's number do you want calcolate: ");
		int n;
		n=in.nextInt();
		
		Fibonacci fib=new Fibonacci(n);
		System.out.println("Fibonacci's("+n+")= "+fib.calcolate(n));
		

	}
}

import java.util.Scanner;

public class Test{
	
	public static void main (String[]args){
		Scanner in=new Scanner(System.in);
		//System.out.println("Inserisci l'n-mo numero di Fibonacci che vuoi calcolare\nn= ");
		System.out.println("Witch Fibonacci's number do you want calcolate: ");
		int n;
		n=in.nextInt();
		if(n<0){
			System.out.println("Insert a positive number");
		}else{
			Fibonacci fib=new Fibonacci(n);
			System.out.println("Fibonacci's("+n+")= "+fib.calcolate(n));
		}

	}
}

Update Test.java