I need help Completing the Programming of a JavaFX Application Using Lambda Expr

ID: 3916324 • Letter: I

Question

I need help Completing the Programming of a JavaFX Application
Using Lambda Expressions
I need help completing the programming of a lambda expression event handler of
a JavaFX application. The application registers students for courses in a term of study. The
application does compile and does run, but it does not produce the expected result as stated in
its requirements.
The code needs to :
• Validate the user course selection for registration against the given registration business
rules
• Display either an error with explanation or a registration confirmation message based on
your validation of user selection
• Update and display the current list of valid registered courses and their total credit hours
The requirements of this application are as follows. The application is register students for
courses in a term of study.
The assumptions used by the application are:
• Each course carries 3 credit hours
• The program terminates only when the student closes it
The program must follow these registration business rules:
• No registration more than once for the same course
• No registration for more than 9 credit hours (e.g. no more than 3 courses)
The application uses the JavaFX GUI platform for its implementation. Students select from a
JavaFX ComboBox menu of courses for which they wish to register.
The program use a lambda expression event handler to validate user selection and act
accordingly. If the user selection is valid against the registration business rules, the program
displays a registration confirmation message to the student for the selected course. Otherwise,
the program displays an error message explaining the reason of the invalidation of the selection.
The application maintains and displays a current list of registered courses. Additionally, the
application maintains and displays a cumulative total credit hours the student has registered for
thus far.
Use these course codes, in this order, to test your application:
• IT2230
• IT3349
• IT2230
• IT4782
• IT4784
2
Success of this assignment will display a valid message or an invalid message,
with reason, for the selected course code. In addition, the application should display and
update current list of registered courses and their cumulative total credit hours. Your program
interaction should look like the sample interaction video, “JAVA FX Register for Course” in the
Resources.

The code I have to use is:

Course.java

*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package u4a1_javafxregisterforcourse;

/**
*
* @author omora
*/
public class Course {

private String code = "";
private boolean isRegisterdFor = false;

public Course(String code){
this.code = code;
}

public void setCode(String code){
this.code = code;
}

public String getCode() {
return this.code;
}


public void setIsRegisteredFor(boolean trueOrFalse){
this.isRegisterdFor = trueOrFalse;
}

public boolean getIsRegisteredFor() {
return this.isRegisterdFor;
}

@Override
public String toString(){
return this.getCode();
}

}

JavaFxRegisterforCourse.java
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package u4a1_javafxregisterforcourse;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.scene.layout.GridPane;
import javafx.geometry.Insets;
import javafx.scene.control.Label;
import javafx.scene.text.Font;
import javafx.scene.text.FontPosture;
import javafx.scene.text.FontWeight;
import javafx.scene.image.ImageView;
import javafx.scene.paint.Color;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.scene.layout.RowConstraints;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TextField;

/**
*
* @author omora
*/
public class U4A1_JavaFXRegisterForCourse extends Application {


GridPane grid = new GridPane();
Label selectPromptLabel = new Label("Please select a course for which you want to register");
ComboBox<Course> coursesComboBox = new ComboBox<>();
Label confirmPromptLabel = new Label("");
Label registeredCoursesPromptLabel = new Label("You are currently registered for");
Label creditHourPromptLabel = new Label("Current total Credit Hours");
Label registeredCoursesLabel = new Label("");
Label creditHoursLabel = new Label("0");

Course choice;
int totalCredit = 0;

@Override
public void start(Stage primaryStage) {

/*
grid.setHgap(0);
grid.setVgap(500);

grid.setGridLinesVisible(true);
*/
RowConstraints row0 = new RowConstraints();
RowConstraints row1 = new RowConstraints();
RowConstraints row2 = new RowConstraints();
RowConstraints row3 = new RowConstraints();
RowConstraints row4 = new RowConstraints();

row0.setPercentHeight(5);
row1.setPercentHeight(50);
row2.setPercentHeight(10);
row3.setPercentHeight(5);
row4.setPercentHeight(15);

grid.getRowConstraints().addAll(row0, row1,row2, row3, row4);

grid.setAlignment(Pos.CENTER);

grid.setHgap(5);
grid.setVgap(5);

grid.add(selectPromptLabel, 0, 0);
grid.setHalignment(selectPromptLabel, HPos.LEFT);

grid.add(coursesComboBox, 0, 1);
grid.setValignment(coursesComboBox, VPos.TOP);

confirmPromptLabel.setTextFill(Color.RED);
grid.add(confirmPromptLabel, 0, 2);
grid.setHalignment(confirmPromptLabel, HPos.LEFT);
grid.setValignment(confirmPromptLabel, VPos.TOP);

grid.add(registeredCoursesPromptLabel, 0, 3);
grid.setHalignment(registeredCoursesPromptLabel, HPos.LEFT);
grid.setValignment(registeredCoursesPromptLabel, VPos.TOP);


grid.add(creditHourPromptLabel, 1, 3);
grid.setHalignment(creditHourPromptLabel, HPos.LEFT);
grid.setValignment(creditHourPromptLabel, VPos.TOP);


grid.add(registeredCoursesLabel, 0, 4);
grid.setHalignment(registeredCoursesLabel, HPos.LEFT);
grid.setValignment(registeredCoursesLabel, VPos.TOP);
registeredCoursesLabel.setStyle("-fx-background-color: #fff600;");

grid.add(creditHoursLabel, 1, 4);
grid.setHalignment(creditHoursLabel, HPos.LEFT);
grid.setValignment(creditHoursLabel, VPos.TOP);
creditHoursLabel.setStyle("-fx-background-color: #fff600;");

Scene scene = new Scene(grid, 500, 500, Color.RED);

primaryStage.setTitle("JavaFX Register for Course");
primaryStage.setScene(scene);
primaryStage.show();


coursesComboBox.setOnAction(e -> {

choice = coursesComboBox.getValue();

// TO DO - Add Code to:
// Validate user selection (the choice Course object)
// Display a confirmation or error message accordingly
// Update display of registered courses and the total credit hours as appropriate

});

}

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

}

Explanation / Answer

here is your modified Code : ----------->>>>>>>>>>>

GridPane grid = new GridPane();
Label selectPromptLabel = new Label("Please select a course for which you want to register");
ComboBox<Course> coursesComboBox = new ComboBox<>();
Label confirmPromptLabel = new Label("");
Label registeredCoursesPromptLabel = new Label("You are currently registered for");
Label creditHourPromptLabel = new Label("Current total Credit Hours");
Label registeredCoursesLabel = new Label("");
Label creditHoursLabel = new Label("0");
Course choice;
int totalCredit = 0;

@Override
public void start(Stage primaryStage) {
/*
grid.setHgap(0);
grid.setVgap(500);
grid.setGridLinesVisible(true);
*/
RowConstraints row0 = new RowConstraints();
RowConstraints row1 = new RowConstraints();
RowConstraints row2 = new RowConstraints();
RowConstraints row3 = new RowConstraints();
RowConstraints row4 = new RowConstraints();

row0.setPercentHeight(5);
row1.setPercentHeight(50);
row2.setPercentHeight(10);
row3.setPercentHeight(5);
row4.setPercentHeight(15);

grid.getRowConstraints().addAll(row0, row1,row2, row3, row4);
grid.setAlignment(Pos.CENTER);
grid.setHgap(5);
grid.setVgap(5);

grid.add(selectPromptLabel, 0, 0);
grid.setHalignment(selectPromptLabel, HPos.LEFT);

coursesComboBox.getItems().addAll(
new Course("IT4782"),
new Course("IT4784"),
new Course("IT4786"),
new Course("IT4789"),
new Course("IT2230"),
new Course("IT3345"),
new Course("IT3349") );
coursesComboBox.setMaxWidth(Double.MAX_VALUE);
grid.add(coursesComboBox, 0, 1);
grid.setValignment(coursesComboBox, VPos.TOP);
confirmPromptLabel.setTextFill(Color.RED);
grid.add(confirmPromptLabel, 0, 2);
grid.setHalignment(confirmPromptLabel, HPos.LEFT);
grid.setValignment(confirmPromptLabel, VPos.TOP);

grid.add(registeredCoursesPromptLabel, 0, 3);
grid.setHalignment(registeredCoursesPromptLabel, HPos.LEFT);
grid.setValignment(registeredCoursesPromptLabel, VPos.TOP);

grid.add(creditHourPromptLabel, 1, 3);
grid.setHalignment(creditHourPromptLabel, HPos.LEFT);
grid.setValignment(creditHourPromptLabel, VPos.TOP);

grid.add(registeredCoursesLabel, 0, 4);
grid.setHalignment(registeredCoursesLabel, HPos.LEFT);
grid.setValignment(registeredCoursesLabel, VPos.TOP);
registeredCoursesLabel.setStyle("-fx-background-color: #fff600;");

grid.add(creditHoursLabel, 1, 4);
grid.setHalignment(creditHoursLabel, HPos.LEFT);
grid.setValignment(creditHoursLabel, VPos.TOP);
creditHoursLabel.setStyle("-fx-background-color: #fff600;");

Scene scene = new Scene(grid, 500, 500, Color.RED);

primaryStage.setTitle("JavaFX Register for Course");
primaryStage.setScene(scene);
primaryStage.show();

coursesComboBox.setOnAction(e -> {

choice = coursesComboBox.getValue();
if(choice.getIsRegisteredFor()){
registeredCoursesPromptLabel.setText("You already registered for this "+choice.toString()+" Course");
}else{
if(totalCredit+3 > 9){
  registeredCoursesPromptLabel.setText("Registration Canceled due to too much Credit Hour.");
}else{
  choice.setIsRegisteredFor(true);
  totalCredit += 3;
  registeredCoursesPromptLabel.setText("Registration successfull for "+choice.toString()+" Course");
}
}
creditHoursLabel.setText(""+totalCredit);
// TO DO - Add Code to:
// Validate user selection (the choice Course object)
// Display a confirmation or error message accordingly
// Update display of registered courses and the total credit hours as appropriate
});

}

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

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