Creating a class "Rational.java":

• Import required package.
• Define the class "Rational".
  • Declare the private variables "the_numerator", and "the_denominator".
  • Define parameterized constructor.
    • Assign "numerator" to "the_numerator".
    • Check if the value of "denominator" is equal to 0.
      • Throw "Arithmetic Exception".
    • Assign "denominator" to "the_denominator".
  • Give mutator methods to set numerator and denominator.
  • Give accessor methods to get the value of numerator and denominator.
  • Give function definition for "value ()".
    • Return the value produced by "the_numerator / the_denominator".
  • Given function "toString ()".
    • Return the string "the_numerator / the_denominator".
  • Define the "main ()" method.
    • Create an object for "Scanner" class.
    • Declare the variables "n", and "d".
    • Get the numerator and denominator from the user.
    • Call the constructor by passing "n", and "d".
    • Call the function "value".
    • Call the function to get the numerator and denominator.
    • Print new line.

Program:

Rational.java:

import java.util.Scanner;

//Define a class

public class Rational

{

//Declare required variables

private int the_numerator;

private int the_denominator;

//Parameterized constructor

public Rational(int numerator, int denominator)

{

//Assign the value of numerator

the_numerator = numerator;

//check if the value is equal to 0

if(denominator == 0)

//Throw an exception with a message

throw new ArithmeticException("Denominator of rational is zero");

//Assign the value of denominator

the_denominator = denominator;

}

//Function to set the value of numerator

public void setNumerator(int numerator)

{

//Set the value

the_numerator = numerator;

}

//Function to set the denominator

public void setDenominator(int denominator)

{

//Check if the value of denominator is equal to 0

if(denominator == 0 )

//Throw an exception

throw new ArithmeticException("Denominator of rational is zero");

...