java fractions

This program is two files!!
I get this error constructor rational in class Rational cannot be applied to given types;
Rational foo = new Rational();
required: int, int
found no arguement
reason actual and formal argument differ in lenght

import java.util.Scanner;
public class RationalTest
{
    public static void main (String args [])
    {
        double num1 = 0;
        double den1 = 0;
        double num2 = 0;
        double den2 = 0;
        int choice;
        int dec;
        Rational foo = new Rational();

        // ask user to enter the values for the fractions
        Scanner input = new Scanner (System.in);

        System.out.print(" this program will do basic math with fractions");

        do{
            System.out.print("please enter the numaortor for the first fraction\n");
            num1 = input.nextDouble();

            System.out.print("Please enter the denominator for the frist fraction\n");
            den1 = input.nextDouble();
            Rational rational1 = new Rational(num1, den1);
            // takes num1 and num2 to create a rational

            System.out.print("Please enter the numeraotor for the second fraction\n");
            num2 = input.nextDouble();

            System.out.print("Please enter the denominator for the second fraction\n");
            den2 = input.nextDouble();

            System.out.print ("please enter the precision\n");
            dec = input.nextInt();

            Rational rational2 = new  Rational (num2, den2);


                System.out.println("1  add fractions\n");
                System.out.println("2 subtract fractions\n");
                System.out.println("3 divide fractions\n");
                System.out.println("4 muliply fractions\n");

                choice = input.nextInt();
                Rational result;
                switch( choice)
                {
                    case 1:
                        result = rational1.getaddfract(rational2);
                        break;

                    case 2:
 result = rationa1.getsubfract(rational2);
                        break;

                    case 3:
                        result = rational1.gettimesfract(rational2);
                        break;

                    case 4:
                        result = rational1.getdividedfract(rational2);
                        break;

                    case 0:
                        System.out.print("Thank you for using this program");
                        break;
                }
            }
            while (choice !=0);

        }
    }

********* 
public class Rational

{
    int numerator; //1
    int denominator; //4
    public Rational(int n, int d)
    {
       this. numerator = n;
       this.denominator = d;
    }

    public Rational  getaddfract (Rational r)
    {
        int num = (numerator * r.denominator)+(r.numerator * denominator);
        // r. = rational from second rational
        int den = (denominator*r.denominator);
        Rational result = new Rational(num, den);
        return result;



    } // end add method
    public  Rational getsubfract( Rational r)
    {
        int num = (numerator * r.denominator)+(r.numerator * denominator);
        int den = (denominator * r.denominator);
        Rational result = new Rational(num,den);
        return result;
    } // end sutraction method

    public Rational gettimesfract (Rational r)
    {
        int num = ( numerator * r.numerator);
        int den = ( denominator * r.denominator);
        Rational result = new Rational (num,den);
        return result;

    } // end times method
    public  Rational getdividedfract (Rational r)
    {
      //  double total =0;
      //  total = ((num1 /num2) / (num2/den2));
      //  return total;
        int num = (numerator / r.denominator);
        int den = (denominator / r.numerator);
        Rational result = new Rational (num,den);
        return result;
    }// end divide method


    public String toString()
    {
        return numerator+"/"+denominator+"\n";
    }

/*    public String toString(int dec)
    {
        return String.format("%."+dec+"f\n",double(numerator)/double(denominator));
    }