Modify the below program that the input values representing fractions are stored with denominators that are positive integers. You cannot require the user to only enter a positive denominator value; the user should not be inconvenienced by such a restriction. For example, whilst values of 1 / -2 are acceptable inputs for a fraction, the output representation should be -1 / 2. Your solution should check the denominator input; if it is negative, swap the sign of both numerator and denominator instance variables.    //Import the essential package import java.util.ArrayList; import java.util.Scanner; //Define the class Fraction class Fraction {         private int n, d;       public Fraction()     {         //Initialize the values         this.n = this.d = 0;     }     public Fraction(int n, int d)     {         //Initialize the variables         this.n = n;         this.d = d;     }     //Define the getter function getNum() that returns the numerator     public int getNum()     {         //Returns numerator         return n;     }     //Define the getter function getDen() that returns the denominator      public int getDen()     {         //Returns denominator         return d;     }     //Define the boolean function isZero() that returns 0 if numerator is 0 and denominator is not equals to zero     public boolean isZero()     {         return (getNum() == 0 && getDen() != 0);     }     //Define the function getSimplifiedFraction() that returns the simplified fraction     public String getSimplifiedFraction()     {         //Decalre the string variable result to store the result         String result = "";         //if the numerator and denominator both are zero         if(getNum() == 0 && getDen() == 0)             //result is zero             result = "0";         //if the numerator is zero and denominator is non-zero         else if(isZero())             //result is zero             result = "0";         //if the numerator is non-zero and denominator is zero         else if(getNum() != 0 && getDen() == 0)             //result is Undefined             result = "Undefined";         //for a defined and non-zero fraction         else         {             //if the remainder is zero             if(getNum() % getDen() == 0)                 result = (getNum() / getDen()) + "";             //if the numerator and denominator both are greater than zero             else if(getNum() < 0 && getDen() < 0)                 result = (getNum() * -1) + "/" + (getDen() * -1);             //if any of them is zero             else if(getNum() < 0 || getDen() < 0)             {                 //if the numerator is greater than zero                 if(getNum() < 0)                     result = "- (" + (getNum() * -1) + "/" + getDen() + ")";                 //if the denominator is zero                             else                     result = "- (" + getNum() + "/" + (getDen() * -1) + ")";             }             //both are non-zero             else                 result = (getNum() + "/" + getDen());         }         //return the result         return result;     }     //Define the method display() that displays the resultant fraction     public void display()     {         //Call and display the fraction         System.out.println(getSimplifiedFraction());     } } //Define the class TestFraction class TestFraction {     //Define the main method     public static void main(String[] args)     {         //Declare the variables to store the numerator and denominator         int num, den;         //Declare an ArrayList to store the results         ArrayList fractions = new ArrayList<>();         //Create the object for scanner class         Scanner sc = new Scanner(System.in);         //use the do-while loop to iterate test the conditions         do         {             //Prompts the user to enter the numerator             System.out.print("Enter the num: ");             //Store the Integer part only             num = Integer.parseInt(sc.nextLine().trim());             //If the numerator is less than zero             if(num < 0)                 //Break from loop                 break;             //Prompts the user to enter the denominator             System.out.print("Enter the den: ");             //store the integer part only             den = Integer.parseInt(sc.nextLine().trim());             //Create the object of Fraction class             Fraction fraction = new Fraction(num, den);             //Add the resultant fractions into the ArrayList             fractions.add(fraction);             //Display the resultant fraction             System.out.println("Fraction added to list as: " + fraction.getSimplifiedFraction() + "\n");         }while(num >= 0);         //Display all fractions that are stored in the ArrayList         System.out.println("\nDISPLAYING ALL FRACTIONS:\n"         + "-------------------------");         //Use the loop to display the values stored in the ArrayList         for(Fraction fr : fractions)                fr.display();             //to print the new line             System.out.println();     } }