Question

You will be designing and creating a Java GUI-based course application.

Create a “Student” class. You need to have at least 3 instance variables (student characteristics like name,…), at least 2 constructors (1 should be a no-arg constructor), set and get methods.

Create a “Course” class that consists of 2 instance variables: the course name and an array of Students (using your Student class).

Design and create a JavaFX-based GUI interface that allows you to :

INPUT information for Course and Students taking the course—you will use your Student and Course classes to save this info and then

OUTPUT all this information in another section of the GUI window (Do not use a JOptionPane) when the user selects a particular course and wants to see the students in the course.

SAVE the information you input into an external file.

NOTE: You can design this window anyway you want … please do not use JOptionPane to do any of this GUI interface … use the JavaFX library.

Answer 1

//Gui.fxml

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

<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane prefHeight="586.0" prefWidth="631.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.GuiController">
<children>
<TextField fx:id="ciTF" layoutX="190.0" layoutY="259.0" prefHeight="39.0" prefWidth="288.0" />
<Label layoutX="43.0" layoutY="196.0" prefHeight="27.0" prefWidth="56.0" text="Credits" />
<Label layoutX="45.0" layoutY="265.0" text="Course Name" />
<TextField fx:id="snTF" layoutX="190.0" layoutY="69.0" prefHeight="39.0" prefWidth="288.0" />
<TextField fx:id="cTF" layoutX="190.0" layoutY="190.0" prefHeight="39.0" prefWidth="288.0" />
<Label layoutX="43.0" layoutY="75.0" text="Student Name" />
<Label layoutX="44.0" layoutY="138.0" text="Division" />
<TextField fx:id="dTF" layoutX="190.0" layoutY="132.0" prefHeight="39.0" prefWidth="288.0" />
<Button layoutX="243.0" layoutY="369.0" mnemonicParsing="false" onAction="#saveInfo" text="Save Information" />
<Button layoutX="76.0" layoutY="369.0" mnemonicParsing="false" onAction="#saveToFile" text="Save to File" />
<MenuBar onMouseClicked="#showDialogBox">
<menus>
<Menu mnemonicParsing="false" text="Show Information" />
</menus>
</MenuBar>
</children>
</AnchorPane>

//Dialog.fxml

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

<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane prefHeight="608.0" prefWidth="613.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.GuiController">
<children>
<ComboBox fx:id="cnCB" promptText="Choose" layoutX="185.0" layoutY="56.0" onAction="#loadStudentName" prefHeight="39.0" prefWidth="228.0" />
<ComboBox fx:id="snCB" promptText="Choose" layoutX="185.0" layoutY="112.0" onAction="#loadStudentInfo" prefHeight="39.0" prefWidth="228.0" />
<Label layoutX="34.0" layoutY="62.0" text="Course Name" />
<Label layoutX="34.0" layoutY="118.0" text="Student Name" />
<Label layoutX="34.0" layoutY="182.0" text="Division" />
<TextField fx:id="cnTF" layoutX="185.0" layoutY="176.0" prefHeight="39.0" prefWidth="228.0" />
<Label layoutX="34.0" layoutY="235.0" text="Class" />
<TextField fx:id="divTF" layoutX="186.0" layoutY="229.0" prefHeight="39.0" prefWidth="228.0" />
</children>
</AnchorPane>

//Main.java

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

public class Main extends Application {
   @Override
   public void start(Stage primaryStage) {
       try {
           Parent root = FXMLLoader.load(getClass().getResource("Gui.fxml"));
           Parent root1 = FXMLLoader.load(getClass().getResource("DialogBox.fxml"));
           Scene scene = new Scene(root,500,500);
           scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
           primaryStage.setScene(scene);
           primaryStage.setTitle("Student-Course Information");
           primaryStage.show();
       } catch(Exception e) {
           e.printStackTrace();
       }
   }
  
   public static void main(String[] args) {
       launch(args);
   }
}

//GuiController.java

package application;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;
import java.util.LinkedList;
import java.util.List;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.TextField;
import javafx.scene.input.MouseEvent;
import javafx.stage.Stage;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.ButtonType;
import javafx.scene.control.ComboBox;

public class GuiController {

   @FXML
   private TextField snTF, cTF, dTF, ciTF, divTF,cnTF;
   @FXML
   private ComboBox<String> cnCB, snCB;

   public static List<Course> list;
  

   @FXML
   protected void saveToFile(ActionEvent event) throws IOException {
  
       BufferedWriter bw = null;
       FileWriter fw = null;
       try {
          
           fw = new FileWriter("C:\\avg\\gui.txt");
           bw = new BufferedWriter(fw);
          
           for(Course c : list) {
               bw.write(c.courseName);
               bw.newLine();
               for(Student s : c.students) {
                   bw.write(s.getName());
                   bw.newLine();
                   bw.write(s.getCredits());
                   bw.newLine();
                   bw.write(s.getDiv());
                   bw.newLine();
               }
           }
           bw.flush();
          
       } catch(Exception e) {
          
       }
      
       fw.close();
       bw.close();
   }
  
   @FXML
   protected void loadStudentInfo(ActionEvent event) {
      
       String course = cnCB.getSelectionModel().getSelectedItem();
       String student = snCB.getSelectionModel().getSelectedItem();

       for (Course c : list) {
           if (c.courseName.equals(course)) {              
               for (Student s : c.students) {
                   if(s.getName().equals(student)) {
                       cnTF.setText(String.valueOf(s.getCredits()));
                       divTF.setText(s.getDiv());
                   }
                  
               }              
           }
       }  
      
   }

   @FXML
   protected void showDialogBox(MouseEvent event) {

       try {
           Stage primaryStage = new Stage();
           FXMLLoader loader = new FXMLLoader(getClass().getResource("DialogBox.fxml"));
           Parent root = (Parent)loader.load();
           GuiController cont = loader.<GuiController>getController();
          
           Scene scene = new Scene(root, 500, 500);
           scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
           primaryStage.setScene(scene);
           primaryStage.setTitle("Student-Course Information");
          
           List<String> courseL = new LinkedList<String>();
           for (Course l : list) {
               courseL.add(l.courseName);
           }
           snTF.getText();
           ObservableList<String> courseList = FXCollections.observableArrayList(courseL);
           cont.cnCB.setItems(courseList);          
           primaryStage.show();          

       } catch (Exception e) {
           e.printStackTrace();
       }
   }

   @FXML
   protected void loadStudentName(ActionEvent event) {  

       String course = cnCB.getSelectionModel().getSelectedItem();

       for (Course c : list) {
           if (c.courseName.equals(course)) {
               List<String> stdName = new LinkedList<>();
               for (Student s : c.students) {
                   stdName.add(s.getName());
               }
               snCB.setItems(FXCollections.observableArrayList(stdName));
           }
       }
   }

   @FXML
   protected void saveInfo(ActionEvent event) {

       if (snTF.getText().equals("")) {

           Alert a = new Alert(AlertType.ERROR);
           a.setTitle("Error");
           a.setContentText("Please enter Student Name");
           a.showAndWait().ifPresent(rs -> {
               if (rs == ButtonType.OK) {

               }
           });
       } else if (cTF.getText().equals("")) {

           Alert a = new Alert(AlertType.ERROR);
           a.setTitle("Error");
           a.setContentText("Please enter Credits");
           a.showAndWait().ifPresent(rs -> {
               if (rs == ButtonType.OK) {

               }
           });
       } else if (ciTF.getText().equals("")) {

           Alert a = new Alert(AlertType.ERROR);
           a.setTitle("Error");
           a.setContentText("Please enter Coure Name");
           a.showAndWait().ifPresent(rs -> {
               if (rs == ButtonType.OK) {

               }
           });
       } else if (dTF.getText().equals("")) {

           Alert a = new Alert(AlertType.ERROR);
           a.setTitle("Error");
           a.setContentText("Please enter Division");
           a.showAndWait().ifPresent(rs -> {
               if (rs == ButtonType.OK) {

               }
           });
       } else {

           Student s = new Student();
           s.setName(snTF.getText());
           s.setDiv(dTF.getText());
           s.setCredits(Integer.parseInt(cTF.getText()));

           Course c = new Course();
           c.courseName = ciTF.getText();
           c.students.add(s);

           if(list == null) {
               list = new LinkedList<Course>();
               list.add(c);
           }
              
          
           else {
               boolean flag = false;
               for(Course co:list) {
                   if(co.courseName.equalsIgnoreCase(c.courseName))
                   {
                       co.students.add(s);
                       flag = true;
                       break;
                   }
               }
               if(!flag)
                   list.add(c);
           }
          
          

           snTF.setText("");
           dTF.setText("");
           cTF.setText("");
           ciTF.setText("");
       }

   }

}

//student.java

package application;

public class Student {

   private String name;
   private String div;
   private int credits;
  
   public Student() {
       name ="";
       div = "";
       credits = 0;         
   }
  
   public Student(String n, String d, int c) {
       name = n;
       div = d;
       credits = c;
   }

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getDiv() {
       return div;
   }

   public void setDiv(String div) {
       this.div = div;
   }

   public int getCredits() {
       return credits;
   }

   public void setCredits(int credits) {
       this.credits = credits;
   }
  
}

//Course.java

package application;

import java.util.LinkedList;
import java.util.List;

public class Course {

   String courseName;
   List<Student> students = new LinkedList<Student>();
  
}

//Create JavaFx project and put all files there