Change the Fraction class so that its instance variables (numerator and denominator) are hidden (i.e. private). Check that the client class (after this change) will now not compile. Why does it  not compile? Provide the changes to the Fraction class and the TestFraction class such that the program can work with the private instance variables by implementing appropriate accessor and mutator methods. import java.util.Scanner; //test program public class te

Change the Fraction class so that its instance variables (numerator and denominator) are hidden (i.e. private). Check that the client class (after this change) will now not compile. Why does it  not compile?

Provide the changes to the Fraction class and the TestFraction class such that the program can work with the private instance variables by implementing appropriate accessor and mutator methods.

import java.util.Scanner;
//test program
public class testfraction{
public static void main(String[] args) {
//create a Scanner object
Scanner in = new Scanner(System.in);
//create new fraction
Fraction frac = new Fraction();
//declare numerator and denominator
int n=1,d;
System.out.print("Enter Fraction's Numerator: ");
//input numerator
n = in.nextInt();
System.out.print("Enter Fraction's Denominator: ");
//input denominator
d = in.nextInt();
//loop execute until the numerator is negative
while(n>=0){
//call input with n and d
frac.input(n, d);
//call display
frac.display();
System.out.print("Enter Fraction's Numerator: ");
//input numerator
n = in.nextInt();
System.out.print("Enter Fraction's Denominator: ");
//input denominator
d = in.nextInt();
}
}
}

//Import the essential package

import java.util.ArrayList;

import java.util.Scanner;

//Define the class Fraction

class Fraction

{

//Declare the variables to store the numerator and denominator

private int n, d;

//Define the default constructor

public Fraction()

{

//Initialize the values

this.n = this.d = 0;

}

//Define the parameterized constructor

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<Fraction> 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();

}

}