Question

I need a Java application with a GUI that includes the following requirements:

• Three classes minimum
• At least one class must use inheritance
• At least one class must be abstract
• Utilization of “get set” method. (get; set; =  is related to how variables are passed between different classes. The get method is used to obtain or retrieve a particular variable value from a class. A set value is used to store the variables. The whole point of the get and set is to retrieve and store the data values accordingly). See below for example of the get set method. V V V V V V V V V V V V V V V
• toString method
• polymorphism
• JavaFX front end – as you will see, JavaFX will allow you to create a GUI user interface.
• The User Interface must respond to events.
• If the application requires a data backend, you can choose to use a database or to use text files. I would prefer text files.
• Error handling - The application should be able to handle invalid data.

I was thinking of something with an ordering system for a restaurant, or something with a school, students, instructors, ID’s, grades, and GPA’s.  

The deliverables needed will be the code and GUI, along with a UML that shows the classes.

Example of get; set; method.

{
abstract class Photo
{
public double Height { get; set; }
public double Width { get; set; }

public double Price { get; set; }

public abstract void DisplayPhotoInfo();

}
}

Answer 1

There are a total of 6 Files:-

Model Classes:-

1.Food.java

2.Drinks.java

Abstract Class

3.Price.java

Controller File

4.FXMLDocumentController.java

FXML frontend FXML File

5.FXMLDocument.fxml

.Main File

6.MyRestaurantFX.java

Below are the codes of the above files:-

1.Food.java

package myrestaurantfx;
public class Food extends Price{
  
private String foodName;

public String getFoodName() {
return foodName;
}

public void setFoodName(String foodName) {
this.foodName = foodName;
}

public float getPrice() {
return price;
}

public void setPrice(float price) {
this.price = price;
}
   
}

2.Drinks.java

package myrestaurantfx;
public class Drinks extends Price{
  
private String drinksName;

public String getDrinksName() {
return drinksName;
}

public void setDrinksName(String drinksName) {
this.drinksName = drinksName;
}

public float getPrice() {
return price;
}

public void setPrice(float price) {
this.price = price;
}
  
}

3.Price.java

package myrestaurantfx;
public class Drinks extends Price{
  
private String drinksName;

public String getDrinksName() {
return drinksName;
}

public void setDrinksName(String drinksName) {
this.drinksName = drinksName;
}

public float getPrice() {
return price;
}

public void setPrice(float price) {
this.price = price;
}
  
}

4.FXMLDocumentController.java

package myrestaurantfx;

import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;

public class FXMLDocumentController implements Initializable {
  
  
// Linking textfields, buttons and textarea with frontend
  
@FXML
private Label label;
  
@FXML
TextField foodTF,drinksTF;
  
@FXML
Button orderFoodBtn,orderDrinksBtn;
  
@FXML
TextArea orderTextArea;
  
  
  
@Override
public void initialize(URL url, ResourceBundle rb) {

}
  
  
@FXML
public void orderFood(ActionEvent ev)
{
Food food=new Food();
String foodName=foodTF.getText();
food.setFoodName(foodName);
ordersPlaced(food);
System.out.print("orderDrink");
  
}

@FXML
public void orderDrinks(ActionEvent ev)
{
Drinks drinks=new Drinks();
String drinksName=drinksTF.getText();
drinks.setDrinksName(drinksName);
ordersPlaced(drinks);
System.out.print("orderDrink");
}


public void ordersPlaced(Object item)
{
String items="";

if(item instanceof Food)
{
items=((Food) item).getFoodName();
}
else if(item instanceof Drinks)
{
items=((Drinks) item).getDrinksName();

}

orderTextArea.setText(orderTextArea.getText()+"\n"+"Your order of "+ items +" is placed"+ "\n");


}
  
  
}

5.FXMLDocument.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="myrestaurantfx.FXMLDocumentController">
<children>
<Label layoutX="218.0" layoutY="36.0" prefHeight="17.0" prefWidth="109.0" style="-fx-background-color: #9ef59d;" text="MY RESTAURANT" textAlignment="RIGHT" />
<Label layoutX="115.0" layoutY="86.0" style="-fx-background-color: #f5bc42;" text="FOOD" />
<Label layoutX="355.0" layoutY="86.0" style="-fx-background-color: #f5bc42;" text="DRINKS" />
<TextField fx:id="foodTF" layoutX="74.0" layoutY="121.0" />
<TextField fx:id="drinksTF" layoutX="316.0" layoutY="121.0" />
<Button fx:id="orderFoodBtn" layoutX="98.0" layoutY="167.0" mnemonicParsing="false" onAction="#orderFood" prefHeight="25.0" prefWidth="102.0" style="-fx-background-color: #9dd4f5;" text="ORDER FOOD" />
<Button fx:id="orderDrinksBtn" layoutX="346.0" layoutY="167.0" mnemonicParsing="false" onAction="#orderDrinks" prefHeight="25.0" prefWidth="109.0" style="-fx-background-color: #9dd4f5;" text="ORDER DRINKS" />
<TextArea fx:id="orderTextArea" layoutX="88.0" layoutY="251.0" prefHeight="102.0" prefWidth="368.0" />
<Label layoutX="206.0" layoutY="219.0" prefHeight="17.0" prefWidth="109.0" style="-fx-background-color: #d89df5;" text="YOUR ORDERS" />
<Label layoutX="75.0" layoutY="103.0" prefHeight="17.0" prefWidth="135.0" style="-fx-background-color: #42f5ce;" text="Bread | Omlette | Chicken" />
<Label layoutX="323.0" layoutY="103.0" prefHeight="17.0" prefWidth="135.0" style="-fx-background-color: #42f5ce;" text="Coke| Whiskey| Wine" />
</children>
</AnchorPane>

MyRestaurantFX .java

package myrestaurantfx;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class MyRestaurantFX extends Application {
  
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
  
Scene scene = new Scene(root);
stage.setTitle("MyRestaurant JavaFx Project");
stage.setScene(scene);
stage.show();
}

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
  
}

Package Structure:

GUI screen

UML Diagram:

The Project is written in Netbeans IDE using Gluon SceneBuilder.