Question

Activity 1: 

Review Chapter 8 and All Inheritance examples.

Build an application that handles setting up vacation plans.

Create an abstract superclass called Vacation

Instance Variables

destination - String

budget - double 

Constructors - default and parameterized to set all instance variables

Access and mutator methods

budgetBalance method - abstract method that returns the amount the vacation is under or over budget.  Under budget is a positive number and over budget is a negative number.

Create a concrete class called AllInclusive that is a subclass of Vacation and represents an all inclusive vacation like Sandals or Club Med.

Instance Variables

brand - String,  such as Sandals , Club Med etc

rating - int,  representing number of stars such as 5 star rating.

price - double,  the total cost of the vacation 

Constructor - default and parameterized to set all instance variables 

Accessor and mutator methods

Overwritten budgetBalance method.

Create a concrete class called ALaCarte that is a subclass of Vacation and represents a vacation that requires payment for each activity separately

Instance Variables

hotelName - String

roomCost - double

airline - String

airfare - double

meals - double - estimated total meal expenses.

Constructor - default and parameterized to set all instance variables 

Accessor and mutator methods

Overwritten budgetBalance method.

Create a VacationTester class

Test all methods.

Polymorphically call the budgetBalance method by creating at least 2 object of each Vacation subclass, and place those object in a collection of the Vacation object.

Answer 1

JAVA PROGRAM

//////////////////Vacation.java////////////////////////////

package test.vacation;
//Abstract superclass: Vacation
public abstract class Vacation {
   private String destination;
   private double budget;
  
   //default constructor
   public Vacation(){
       this.destination = "";
       this.budget = 0;
   }
   //parameterized constructor
   public Vacation(String destination, double budget) {
       this.destination = destination;
       this.budget = budget;
   }
  
   //getters and setters
   public String getDestination() {
       return destination;
   }
   public void setDestination(String destination) {
       this.destination = destination;
   }
   public double getBudget() {
       return budget;
   }
   public void setBudget(double budget) {
       this.budget = budget;
   }
  
   /**
   * returns the amount the vacation is under or over budget.
   * Under budget is a positive number and over budget is a negative number.
   * Has to be implemented in the concrete class extending the abstract Vacation class
   */
   public abstract double budgetBalance();

}

//////////////////AllInclusive.java/////////////////////////////////////

package test.vacation;

/**
* a concrete class called AllInclusive that is a subclass of Vacation
* and represents an all inclusive vacation like Sandals or Club Med
*/
public class AllInclusive extends Vacation {
   //private fields
   private String brand;
   private int rating;
   private double price;
  
   //default constructor
   public AllInclusive() {
       super(); //default constructor of Vacation is called here
       this.brand = "";
       this.rating = 0;
       this.price = 0;
   }
  
   //parameterized constructor
   public AllInclusive(String destination,double budget, String brand, int rating, double price) {
       super(destination,budget); //parameterized constructor of Vacation is called here
       this.brand = brand;
       this.rating = rating;
       this.price = price;
   }
  
   //getters and setters
   public String getBrand() {
       return brand;
   }
   public void setBrand(String brand) {
       this.brand = brand;
   }
   public int getRating() {
       return rating;
   }
   public void setRating(int rating) {
       this.rating = rating;
   }
   public double getPrice() {
       return price;
   }
   public void setPrice(double price) {
       this.price = price;
   }
  
  
  
   @Override
   //overridden budgetBalance method
   public double budgetBalance() {
       double budget = getBudget();
       return this.price - budget;
   }

}

/////////////////ALaCarte.java/////////////////////////

package test.vacation;

/**
*
* a concrete class called ALaCarte that is a subclass of Vacation
* and represents a vacation that requires payment
* for each activity separately
*
*/
public class ALaCarte extends Vacation {
   //private fields
   private String hotelName;
   private double roomCost;
   private String airline;
   private double airfare;
   private double meals;  
  
   //default constructor
   public ALaCarte() {
       super();//default constructor of Vacation is called here
       this.hotelName = "";
       this.roomCost = 0;
       this.airline = "";
       this.airfare = 0;
       this.meals = 0;
   }
  
   //parameterized constructor
   public ALaCarte(String destination, double budget, String hotelName, double roomCost,
           String airline, double airfare, double meals) {
       super(destination,budget);//parameterized constructor of Vacation is called here
       this.hotelName = hotelName;
       this.roomCost = roomCost;
       this.airline = airline;
       this.airfare = airfare;
       this.meals = meals;
   }
  
  
   //getters and setters
   public String getHotelName() {
       return hotelName;
   }

   public void setHotelName(String hotelName) {
       this.hotelName = hotelName;
   }

   public double getRoomCost() {
       return roomCost;
   }

   public void setRoomCost(double roomCost) {
       this.roomCost = roomCost;
   }

   public String getAirline() {
       return airline;
   }

   public void setAirline(String airline) {
       this.airline = airline;
   }

   public double getAirfare() {
       return airfare;
   }

   public void setAirfare(double airfare) {
       this.airfare = airfare;
   }

   public double getMeals() {
       return meals;
   }

   public void setMeals(double meals) {
       this.meals = meals;
   }

   @Override
   //overridden budgetBalance method
   public double budgetBalance() {
       double budget = getBudget();
       double totalPrice = this.roomCost + this.airfare + this.meals;
       return totalPrice - budget;
   }

}

//////////////////////VacationTester.java/////////////////////////////////

package test.vacation;

import java.util.ArrayList;
import java.util.List;
//Testers class for Vacation
public class VacationTester {
  
   public static void main(String[] args){
       //create array list of vacations
       List<Vacation> vacations = new ArrayList<Vacation>();
      
       //Create AllInclusive instance using default constructor
       //and then set fields using setters
       AllInclusive va1 = new AllInclusive();
       va1.setBudget(1500);
       va1.setDestination("Europe");
       va1.setBrand("Sandals");
       va1.setRating(3);
       va1.setPrice(1350);
      
       vacations.add(va1); //add the instance into the vacations list
      
       //Create ALaCarte instance using default constructor
       //and then set fields using setters
       ALaCarte vc1 = new ALaCarte();
       vc1.setBudget(1500);
       vc1.setDestination("Europe");
       vc1.setAirline("Emirates");
       vc1.setAirfare(795);
       vc1.setHotelName("The KingPlace");
       vc1.setRoomCost(300);
       vc1.setMeals(596);
      
       vacations.add(vc1); //add the instance into the vacations list
      
       //Create AllInclusive instance using parametrized constructor
       AllInclusive va2 = new AllInclusive("Mexico",1200,"Club Med", 4, 1350);
       vacations.add(va2); //add the instance into the vacations list
      
       //Create ALaCarte instnce using parameterized constructor
       ALaCarte vc2 = new ALaCarte("Mexico", 1200, "Holiday Inn", 469, "KLM", 469, 516);
       vacations.add(vc2); //add the instance into the vacations list
      
      
       int counter = 0;
       //Traverse the vacations list
       for(Vacation v : vacations){
           System.out.println("\nVacation#"+ ++counter); //print the vacation number
           System.out.println("========================");
           if(v instanceof AllInclusive){
               //If current vacation is a AllInclusive
               AllInclusive ai = (AllInclusive)v; //cast it
               //print data using getters
               System.out.println("Destination: "+ai.getDestination());
               System.out.println("Budget: "+ai.getBudget()+"USD");
               System.out.println("Brand: "+ai.getBrand());
               System.out.println("Rating: "+ai.getRating());
               System.out.println("Price: "+ai.getPrice());
           }else if(v instanceof ALaCarte){
               //If current vacation is a ALaCarte
               ALaCarte ac = (ALaCarte)v; //cast it
               //print data using getters
               System.out.println("Destination: "+ac.getDestination());
               System.out.println("Budget: "+ac.getBudget()+"USD");
               System.out.println("Hotel name: "+ac.getHotelName());
               System.out.println("Airfare: "+ac.getAirfare()+"USD");
               System.out.println("Meals : "+ac.getMeals()+"USD");
           }
           //get budgetBalance using polymorphism
           //i.e actual instance and its budgetBalance behaviour is decided at runtime
           double budgetBalance = v.budgetBalance();
          
           //print the value and whether the vacation is over or under budget
           System.out.println("Budget balance: "+budgetBalance+"USD");
           if(budgetBalance > 0){
               System.out.println("THe vacation is in Over Budget");
           }else{
               System.out.println("The vacation is Under Budget");
           }
       }
      
   }

}

================================

OUTPUT

================================

Vacation#1
========================
Destination: Europe
Budget: 1500.0USD
Brand: Sandals
Rating: 3
Price: 1350.0
Budget balance: -150.0USD
The vacation is Under Budget

Vacation#2
========================
Destination: Europe
Budget: 1500.0USD
Hotel name: The KingPlace
Airfare: 795.0USD
Meals : 596.0USD
Budget balance: 191.0USD
THe vacation is in Over Budget

Vacation#3
========================
Destination: Mexico
Budget: 1200.0USD
Brand: Club Med
Rating: 4
Price: 1350.0
Budget balance: 150.0USD
THe vacation is in Over Budget

Vacation#4
========================
Destination: Mexico
Budget: 1200.0USD
Hotel name: Holiday Inn
Airfare: 469.0USD
Meals : 516.0USD
Budget balance: 254.0USD
THe vacation is in Over Budget