$1.$ Write a Passenger class with private data for passenger name and priority $(1,2)$ with natural ordering

from the Comparable interface defined by the priority level.

$2.$ Fill in the missing code in the App.java program to fill the priority queue with passenger data,

complete the GUI form showing seats, and fill in remaining code as marked by the $//$ TODO: comments.

Be sure to test your code on both data sets, passengers$1.$txt and passengers$2.$txt$.$ You do not have to

do data validation unless you wish so can assume normal and valid data. Code for InitalApp class: package school.assg;

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.control.Label;

import javafx.scene.control.Button;

import javafx.scene.control.TextField;

import javafx.scene.layout.BorderPane;

import javafx.scene.layout.StackPane;

import javafx.scene.layout.GridPane;

import javafx.scene.layout.VBox;

import javafx.stage.Stage;

import javafx.geometry.Pos;

import javafx.geometry.Insets;

import javafx.scene.text.Font;

import javafx.scene.text.FontWeight;

import javafx.scene.paint.Color;

import javafx.scene.layout.Background;

import javafx.scene.layout.BackgroundFill;

import java.io$.*$;

import java.util.PriorityQueue;

import java.util.Scanner;

public class AppInitial extends Application $\{$

$//$ priority queue of passengers

$//$ priority $1$ is first class, priority $2$ is economy

private PriorityQueue passengers $=$ new PriorityQueue$<>()$;

private Button $[][]$ seats $=$ null; $//2$D array of buttons that represent the seats

private TextField passengerTextField; $//$ displays passenger name

private final int WIDTH $=15$; $//$ width of text for button

private int nrows, ncolumns; $//$ number of rows and columns

private String blankString; $//$ string of WIDTH spaces

@Override

public void start$($Stage stage$)\{$

Scanner filescan $=$ null;

try

$\{$ filescan $=$ new Scanner $($new File$("$passengers$1.$txt$"))$;

$\}$

catch $($IOException e$)$

$\{$ System.out.println $("$open error"$)$;

System.exit$(1)$;

$\}$

nrows $=$ filescan.nextInt$()$; $//$ number of rows

ncolumns $=$ filescan.nextInt$()$; $//$ number of columns

filescan.nextLine$()$; $//$ extract newline

$//$ fonts for the buttons and top label

Font fontlabel $=$ Font.font$("$Monospaced$",$ FontWeight.EXTRA$\_$BOLD, $25)$;

Font fontbutton $=$ Font.font$("$Monospaced$",$ FontWeight.EXTRA$\_$BOLD, $12)$;

seats $=$ new Button $[$nrows$][$ncolumns$]$; $//$ make the $2$D array of buttons

blankString $="".$repeat$($WIDTH$)$; $//$ string of blanks

$//$ make the buttons

for $($int r$=0$; r $\{$ processPassenger$()$; $\})$;

passengerTextField $=$ new TextField$()$;

passengerTextField.setEditable$($false$)$;

$//$ exit button

Button exitButton $=$ new Button $("$Exit$")$;

exitButton.setOnAction$($event $->\{$ System.exit$(0)$; $\})$;

$//$ add content to left pane

leftPane.getChildren$().$add$($processButton$)$;

leftPane.getChildren$().$add$($passengerTextField$)$;

leftPane.getChildren$().$add$($exitButton$)$;

leftPane.setAlignment$($Pos$.$TOP$\_$CENTER$)$;

leftPane.setPadding$($new Insets$(25,25,25,25))$;

$//$ add the left pane to the outer pane

outerpane.setLeft$($leftPane$)$;

$//$ center pane is a GridPane

GridPane centerPane $=$ new Gri