Part I Write a class PassengerListException that extends Exception with the foll

Question

Part I

Write a class PassengerListException that extends Exception with the following constructors:

- A default constructor that gives the error message "Too many passengers."

- A constructor that takes a string and uses this for the error message

Part II

Write a class PassengerCar with the following attributes:

-Two instance variables (with corresponding getters and setters):

-model - a String for the model of the passenger car.

-passengers - an array of Strings with length 4, holding the names of the passengers the Car holds.

-A default constructor that initializes name to be "NoName".

-A constructor that takes a String to set the model of the car

Two methods:

-assignPassengers (no input parameters or return values) - This method should ask a user to input passenger from the console window until the user enters an empty line, which indicates the end of the array. If the user enters more than 4 passengers, throw a PassengerListException

-writeCar (no input parameters or return values) - writes the model of the car and the names of the cars's passengers to the console window

Part III

Write a class Coupe, a subclass of PassengerCar, for cars which can hold at most 2 passengers. The class should include the following:

-A default constructor that invokes the superclass constructor

-A constructor that takes a String to set the model of the Coupe

-An overridden assignPassengers that throws a PassengerListException when a user tries to assign more than 2 passengers to a Coupe.

Part IV

Write a class TestCar that does the following:

1. Creates a car with the model Ford Mustang

2. Assigns some Passengers to the Ford Mustang

3. Writes the information about the Ford Mustang to the console window

4. Creates a Coupe with the name Deuce Coupe

5. Assigns passengers to the Deuce Coupe

6. Writes the information about the Deuce Coupe to the console

Explanation / Answer

Solution:

package com.nancy.chegg.exception.example;

public class PassengerListException extends Exception {

   private static final long serialVersionUID = 1L;
   String msg = null;
   public PassengerListException() {
       super();
       msg = "Too many passengers.";
       System.out.println("********************");
       System.out.println("ERROR : " + msg);
       System.out.println("********************");
   }

   public PassengerListException(String msg) {
       super(msg);
       this.msg = msg;
       System.out.println("********************");
       System.out.println("ERROR : " + msg);
       System.out.println("********************");
   }
}

______________________________________________

package com.nancy.chegg.exception.example;

import java.util.Scanner;

public class PassengerCar {
   String model;
   String[] passengers = new String[4];

   PassengerCar() {
       this.model = "NoName";
   }

   PassengerCar(String name) {
       this.model = name;
   }

   public void assignPassengers() throws PassengerListException {

       System.out.println("Please assign some passengers to " + this.model);
       Scanner scan = new Scanner(System.in);
       int counter = 0;
       while (counter <= 4) {
           System.out.println("Enter passengers name : ");
           passengers[counter] = scan.nextLine();
           if (passengers[counter].equals("")) {
               break;
           }
           counter++;
           if (counter == 4) {
               throw new PassengerListException();
           }
       }
   }

   public void writeCar() {
       System.out.println("Model : " + model);
       System.out.println("passengers details : ");
       for (int i = 0; i < 4 && passengers[i] != null
               && !passengers[i].equals(""); i++) {
           System.out.println((i + 1) + ". " + passengers[i]);
       }

   }
}

___________________________________________________________

package com.nancy.chegg.exception.example;

import java.util.Scanner;

public class Coupe extends PassengerCar{
  
   Coupe(){
       super();
   }
  
   Coupe(String name){
       this.model = name;
   }
   @Override
   public void assignPassengers() throws PassengerListException {
       System.out.println("Please assign passengers to " + this.model);
       Scanner scan = new Scanner(System.in);
       int counter = 0;
       while (counter <= 2) {
           System.out.println("Enter passengers name : ");
           passengers[counter] = scan.nextLine();
           counter++;
           if(counter == 2) {
               throw new PassengerListException();
           }
       }
   }

}

____________________________________________________

package com.nancy.chegg.exception.example;

public class TestCar {

   public static void main(String[] args) {
      
       PassengerCar stu1 = new PassengerCar("Ford Mustang");
       try {
           stu1.assignPassengers();
       } catch (PassengerListException e) {
       }
       stu1.writeCar();
      
       Coupe stu2 = new Coupe("Deuce Coupe");
       try {
           stu2.assignPassengers();
       } catch (PassengerListException e) {
       }
       stu2.writeCar();

   }

}

Sample run :

Please assign some passengers to Ford Mustang
Enter passengers name :
nancy
Enter passengers name :
menu
Enter passengers name :
meku
Enter passengers name :

Model : Ford Mustang
passengers details :
1. nancy
2. menu
3. meku
Please assign passengers to Deuce Coupe
Enter passengers name :
manir
Enter passengers name :
many
********************
ERROR : Too many passengers.
********************
Model : Deuce Coupe
passengers details :
1. manir
2. many

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