Make the Rational class work with the GUI. Handling exceptions must be included.

If you do not use the Rational class I will get a 0 and you will get thumbs down.

Use eclipse

Code for Rational.java:

package edu.pupr.rational;

import java.util.Scanner;

public class Rational {

private int num;

private int den;

public Rational() {

num = 1;

den = 2;

}

public Rational(int num, int den) {

int g = gcd(num,den);

this.num = num/g;

this.den = den/g;

}

public int getNumerator() {

return num;

}

public void setNumerator(int numerator) {

this.num = numerator;

}

public int getDenominator() {

return den;

}

public void setDenominator(int denominator) {

this.den = denominator;

}

public Rational multiply(Rational r) {

int nume = num * r.num;

int denom = den * r.den;

return new Rational(nume, denom);

}

public Rational divide(Rational r) {

int nume = num * r.den;

int denom = den * r.num;

return new Rational(nume, denom);

}

public Rational add(Rational r) {

int nume = num * r.den + r.num * den;

int denom = den * r.den;

return new Rational(nume, denom);

}

public Rational subtract(Rational r) {

int nume = num * r.den - r.num * den;

int denom = den * r.den;

return new Rational(nume, denom);

}

public static int gcd(int a, int b){

if(b==0)return a;

return gcd(b,a%b);

}

public void ask() throws RationalException {

@SuppressWarnings("resource")

Scanner input = new Scanner(System.in);

System.out.print("Enter the numerator: ");

num = input.nextInt();

System.out.print("Enter the denominator(greater than 0): ");

den = input.nextInt();

if(den == 0) {

throw new RationalException("0 is not a valid denominator.");

}

}

public String toString() {

return "(" + num + "/" + den + ")";

}

}

Code for Rational_GUI.java:

package edu.pupr.edu;

import java.awt.BorderLayout;

import java.awt.EventQueue;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

import javax.swing.JLabel;

import java.awt.FlowLayout;

import java.awt.CardLayout;

import javax.swing.JTextField;

import javax.swing.JRadioButton;

import javax.swing.JButton;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import javax.swing.JTextArea;

public class Rational_GUI extends JFrame {

private JPanel contentPane;

private JTextField textField;

private JTextField textField_1;

/**

* Launch the application.

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

Rational_GUI frame = new Rational_GUI();

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

//Create the frame.

public Rational_GUI() {

int number1;

int number2;

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 450, 300);

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

contentPane.setLayout(null);

JLabel lblNewLabel = new JLabel("Rational #1:");

lblNewLabel.setBounds(12, 32, 71, 16);

contentPane.add(lblNewLabel);

JLabel lblRational = new JLabel("Rational #2:");

lblRational.setBounds(12, 70, 71, 16);

contentPane.add(lblRational);

textField = new JTextField();

textField.setBounds(95, 29, 116, 22);

contentPane.add(textField);

textField.setColumns(10);

textField_1 = new JTextField();

textField_1.setBounds(95, 67, 116, 22);

contentPane.add(textField_1);

textField_1.setColumns(10);

JRadioButton rdbtnNewRadioButton = new JRadioButton("Addition");

rdbtnNewRadioButton.setSelected(true);

rdbtnNewRadioButton.setBounds(245, 32, 75, 25);

contentPane.add(rdbtnNewRadioButton);

JRadioButton rdbtnNewRadioButton_1 = new JRadioButton("Multiplication");

rdbtnNewRadioButton_1.setBounds(245, 61, 103, 25);

contentPane.add(rdbtnNewRadioButton_1);

JRadioButton rdbtnNewRadioButton_2 = new JRadioButton("Subtract");

rdbtnNewRadioButton_2.setBounds(355, 32, 77, 25);

contentPane.add(rdbtnNewRadioButton_2);

JRadioButton rdbtnDivision = new JRadioButton("Division");

rdbtnDivision.setBounds(355, 61, 77, 25);

contentPane.add(rdbtnDivision);

JButton btnGetResults = new JButton("Get Result");

btnGetResults.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent arg0) {

}

});

btnGetResults.setBounds(20, 113, 408, 25);

contentPane.add(btnGetResults);

JTextArea textArea = new JTextArea();

textArea.setEditable(false);

textArea.setBounds(20, 151, 408, 89);

contentPane.add(textArea);

}

}

Code for Exception Handling (Rational_Exception.java):

package edu.pupr.rational;

@SuppressWarnings("serial")

public class RationalException extends Exception {

public RationalException() {

}

public RationalException(String message) {

super(message);

}

public RationalException(String message, Throwable cause) {

super(message, cause);

}

public RationalException(Throwable cause) {

super(cause);

}

public RationalException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {

super(message, cause, enableSuppression, writableStackTrace);

}

@Override

public String toString() {

return "Rational Exception: " + getMessage() + " Cause: " + getCause();

}

}

Rational Rational #1: 1/4 Addtion O Subtract O Multiplication Division Rational #2: 1/2 Get Result 3/4