Question

Section 0

Problem Background A local entrepreneur has investments in property and vehicles. Recently business has boomed and she needs object-oriented software to keep track of her current and past assets. As an OOP expert, you are tasked to write a program that keeps track of these assets. You are recommended to read through the requirements of all sections before attempting any coding.

Section 1: Basic Classes

• A House class with instance variables erfNumber, location, noOfRooms, etc. • Mandatory properties: status(is the asset owned or sold), number of years owned, selling price, and buying price. • At least two overloaded constructors that can be used to instatiate House objects. • Getter and setter methods for all properties you have created. • A method checkProfitOrLoss() that returns the profit or loss that can be made if the property is sold (sellingPrice-buyingPrice). • A custom toString() method to print out all the properties of a House object. • A static counter to keep track of the number of each object created. • At least 5 more property or vehicle classes such as Farm, Flat, Bakkie, RentalCar, etc.

Section 2: Driver Class

• A driver class named AssetManager. • An array of five House objects. The same applies to other classes created in Section 1.

• Methods to add (remember to keep the sizes of the arrays in mind), sell assets (sets the status of an asset at a given index of an array to sold), and print the contents of each of the objects for each array. Each method to have proper Javadoc comments.

• Code to enter from input five of each of the assets into respective arrays using the add methods just created.

• Printing out the contents of all the arrays using the print methods you have created to provide an initial asset report.

• Change the current value of at least 10 objects from the arrays using the getter and setter methods.

• Print out the contents of the assets that can be sold at a profit using the checkProfitOrLoss method and the methods you have provided an asset sales report.

Section 3: Advanced Requirements

Writing to a file is better that using volatile memory. Inheritance allows code reuse, thus saving time.

Exceptions are handy when dealing with issues that may disrrupt normal program. Your creativity is expected to demonstrate deep understanding of OOP concepts you learned this semester. This can be achieved by redesigning Sections 1 and 2 to solve the problem in Section 0. Note that Section 1 and 2 were given you to have a general understanding of what your program solution should do.

Your final solution should have at least a 3 level hierarchy of inheritance, an abstract class, two interfaces, polymorphism, aggregation, and composition, apart from writing to files and using exception handling. A UML class diagram denoting your design will be required as well.

Answer 1

/****************************Asset.java*******************/

/**
* The Class Assest.
*/
public abstract class Assest {

   /** The owner name. */
   private String ownerName;

   /** The assest id. */
   private int assestId;

   /** The number of assest. */
   private static int numberOfAssest = 0;

   /**
   * Instantiates a new assest.
   *
   * @param ownerName the owner name
   * @param assestId the assest id
   */
   public Assest(String ownerName, int assestId) {
       super();
       this.ownerName = ownerName;
       this.assestId = assestId;
       numberOfAssest++;
   }

   /**
   * Gets the owner name.
   *
   * @return the owner name
   */
   public String getOwnerName() {
       return ownerName;
   }

   /**
   * Sets the owner name.
   *
   * @param ownerName the new owner name
   */
   public void setOwnerName(String ownerName) {
       this.ownerName = ownerName;
   }

   /**
   * Gets the assest id.
   *
   * @return the assest id
   */
   public int getAssestId() {
       return assestId;
   }

   /**
   * Sets the assest id.
   *
   * @param assestId the new assest id
   */
   public void setAssestId(int assestId) {
       this.assestId = assestId;
   }

   /**
   * Gets the number of assest.
   *
   * @return the number of assest
   */
   public static int getNumberOfAssest() {
       return numberOfAssest;
   }

   /**
   * Check profit or loss.
   *
   * @return the double
   */
   public abstract double checkProfitOrLoss();

   /**
   * Prints the.
   */
   public abstract void print();

   /*
   * (non-Javadoc)
   *
   * @see java.lang.Object#equals(java.lang.Object)
   */
   @Override
   public boolean equals(Object obj) {

       if (this.ownerName.equalsIgnoreCase(((Assest) obj).ownerName) && this.assestId == ((Assest) obj).assestId) {

           return true;
       } else {
           return false;
       }
   }

}
/************************************House.java**********************/

/**
* The Class House.
*/
public class House extends Assest {

   /** The erf number. */
   private int erfNumber;

   /** The location. */
   private String location;

   /** The no of rooms. */
   private int noOfRooms;

   /** The status. */
   private String status;

   /** The no of years owned. */
   private int noOfYearsOwned;

   /** The selling price. */
   private double sellingPrice;

   /** The buying price. */
   private double buyingPrice;

   /** The number of houses. */
   private static int numberOfHouses;

   /**
   * Instantiates a new house.
   *
   * @param status the status
   * @param noOfYearsOwned the no of years owned
   * @param sellingPrice the selling price
   * @param buyingPrice the buying price
   * @param ownerName the owner name
   */
   public House(String status, int noOfYearsOwned, double sellingPrice, double buyingPrice, String ownerName,
           int assestId) {
       super(ownerName, assestId);
       this.status = status;
       this.noOfYearsOwned = noOfYearsOwned;
       this.sellingPrice = sellingPrice;
       this.buyingPrice = buyingPrice;
       numberOfHouses++;
   }

   /**
   * Instantiates a new house.
   *
   * @param erfNumber the erf number
   * @param location the location
   * @param noOfRooms the no of rooms
   * @param status the status
   * @param noOfYearsOwned the no of years owned
   * @param sellingPrice the selling price
   * @param buyingPrice the buying price
   * @param ownerName the owner name
   */
   public House(int erfNumber, String location, int noOfRooms, String status, int noOfYearsOwned, double sellingPrice,
           double buyingPrice, String ownerName, int assestId) {
       super(ownerName, assestId);
       this.erfNumber = erfNumber;
       this.location = location;
       this.noOfRooms = noOfRooms;
       this.status = status;
       this.noOfYearsOwned = noOfYearsOwned;
       this.sellingPrice = sellingPrice;
       this.buyingPrice = buyingPrice;
       numberOfHouses++;
   }

   /**
   * Gets the erf number.
   *
   * @return the erf number
   */
   public int getErfNumber() {
       return erfNumber;
   }

   /**
   * Sets the erf number.
   *
   * @param erfNumber the new erf number
   */
   public void setErfNumber(int erfNumber) {
       this.erfNumber = erfNumber;
   }

   /**
   * Gets the location.
   *
   * @return the location
   */
   public String getLocation() {
       return location;
   }

   /**
   * Sets the location.
   *
   * @param location the new location
   */
   public void setLocation(String location) {
       this.location = location;
   }

   /**
   * Gets the no of rooms.
   *
   * @return the no of rooms
   */
   public int getNoOfRooms() {
       return noOfRooms;
   }

   /**
   * Sets the no of rooms.
   *
   * @param noOfRooms the new no of rooms
   */
   public void setNoOfRooms(int noOfRooms) {
       this.noOfRooms = noOfRooms;
   }

   /**
   * Gets the status.
   *
   * @return the status
   */
   public String getStatus() {
       return status;
   }

   /**
   * Sets the status.
   *
   * @param status the new status
   */
   public void setStatus(String status) {
       this.status = status;
   }

   /**
   * Gets the no of years owned.
   *
   * @return the no of years owned
   */
   public int getNoOfYearsOwned() {
       return noOfYearsOwned;
   }

   /**
   * Sets the no of years owned.
   *
   * @param noOfYearsOwned the new no of years owned
   */
   public void setNoOfYearsOwned(int noOfYearsOwned) {
       this.noOfYearsOwned = noOfYearsOwned;
   }

   /**
   * Gets the selling price.
   *
   * @return the selling price
   */
   public double getSellingPrice() {
       return sellingPrice;
   }

   /**
   * Sets the selling price.
   *
   * @param sellingPrice the new selling price
   */
   public void setSellingPrice(double sellingPrice) {
       this.sellingPrice = sellingPrice;
   }

   /**
   * Gets the buying price.
   *
   * @return the buying price
   */
   public double getBuyingPrice() {
       return buyingPrice;
   }

   /**
   * Sets the buying price.
   *
   * @param buyingPrice the new buying price
   */
   public void setBuyingPrice(double buyingPrice) {
       this.buyingPrice = buyingPrice;
   }

   /**
   * Gets the number of houses.
   *
   * @return the number of houses
   */
   public static int getNumberOfHouses() {
       return numberOfHouses;
   }

   /*
   * (non-Javadoc)
   *
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {
       return "House [erfNumber=" + erfNumber + ", location=" + location + ", noOfRooms=" + noOfRooms + ", status="
               + status + ", noOfYearsOwned=" + noOfYearsOwned + ", sellingPrice=" + sellingPrice + ", buyingPrice="
               + buyingPrice + "]";
   }

   /*
   * (non-Javadoc)
   *
   * @see Assest#checkProfitOrLoss()
   */
   public double checkProfitOrLoss() {

       return sellingPrice - buyingPrice;
   }

   /*
   * (non-Javadoc)
   *
   * @see Assest#print()
   */
   @Override
   public void print() {

       System.out.println(this.toString());

   }

}
/************************************Vehicle.java***********************/

/**
* The Class Vehicle.
*/
public class Vehicle extends Assest {

   /** The make. */
   private String make;

   /** The model. */
   private String model;

   /** The year. */
   private String year;

   /** The price. */
   private double price;

   /** The sellig price. */
   private double selligPrice;

   /** The buying price. */
   private double buyingPrice;

   /**
   * Instantiates a new vehicle.
   *
   * @param make the make
   * @param model the model
   * @param year the year
   * @param ownerName the owner name
   */
   public Vehicle(String make, String model, String year, String ownerName, int assestId) {
       super(ownerName, assestId);
       this.make = make;
       this.model = model;
       this.year = year;
   }

   /**
   * Instantiates a new vehicle.
   *
   * @param make the make
   * @param model the model
   * @param year the year
   * @param price the price
   * @param ownerName the owner name
   */
   public Vehicle(String make, String model, String year, double price, String ownerName, int assestId) {
       super(ownerName, assestId);
       this.make = make;
       this.model = model;
       this.year = year;
       this.price = price;
   }

   /**
   * Gets the make.
   *
   * @return the make
   */
   public String getMake() {
       return make;
   }

   /**
   * Sets the make.
   *
   * @param make the new make
   */
   public void setMake(String make) {
       this.make = make;
   }

   /**
   * Gets the model.
   *
   * @return the model
   */
   public String getModel() {
       return model;
   }

   /**
   * Sets the model.
   *
   * @param model the new model
   */
   public void setModel(String model) {
       this.model = model;
   }

   /**
   * Gets the year.
   *
   * @return the year
   */
   public String getYear() {
       return year;
   }

   /**
   * Sets the year.
   *
   * @param year the new year
   */
   public void setYear(String year) {
       this.year = year;
   }

   /**
   * Gets the price.
   *
   * @return the price
   */
   public double getPrice() {
       return price;
   }

   /**
   * Sets the price.
   *
   * @param price the new price
   */
   public void setPrice(double price) {
       this.price = price;
   }

   /**
   * Gets the sellig price.
   *
   * @return the sellig price
   */
   public double getSelligPrice() {
       return selligPrice;
   }

   /**
   * Sets the sellig price.
   *
   * @param selligPrice the new sellig price
   */
   public void setSelligPrice(double selligPrice) {
       this.selligPrice = selligPrice;
   }

   /**
   * Gets the buying price.
   *
   * @return the buying price
   */
   public double getBuyingPrice() {
       return buyingPrice;
   }

   /**
   * Sets the buying price.
   *
   * @param buyingPrice the new buying price
   */
   public void setBuyingPrice(double buyingPrice) {
       this.buyingPrice = buyingPrice;
   }

   /*
   * (non-Javadoc)
   *
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {
       return "Vehicle [make=" + make + ", model=" + model + ", year=" + year + ", price=" + price + "]";
   }

   /*
   * (non-Javadoc)
   *
   * @see Assest#checkProfitOrLoss()
   */
   @Override
   public double checkProfitOrLoss() {

       return selligPrice - buyingPrice;
   }

   /*
   * (non-Javadoc)
   *
   * @see Assest#print()
   */
   @Override
   public void print() {

       System.out.println(this.toString());

   }

}
/*******************************AssestManager.java*********************/

/**
* The Class AssetManager.
*/
public class AssetManager {

   /** The assests. */
   private Assest[] assests;

   /** The capacity. */
   private int capacity;

   /** The index. */
   private int index;

   /**
   * Instantiates a new asset manager.
   */
   public AssetManager() {
       this.index = 0;
       this.capacity = 5;
       assests = new Assest[capacity];
   }

   /**
   * Adds the assest.
   *
   * @param asset the asset
   */
   public void addAssest(Assest asset) {

       if (index == capacity) {
           capacity = 2 * capacity;
           resize(2 * capacity);
       }

       assests[index] = asset;
       index++;

   }

   /**
   * Resize.
   *
   * @param i the i
   */
   private void resize(int i) {

       Assest[] assestsCopy = new Assest[i];
       for (int j = 0; j < assests.length; j++) {

           assestsCopy[j] = assests[j];
       }
       assests = assestsCopy;
   }

   /**
   * Sell assest.
   *
   * @param assest the assest
   */
   public void sellAssest(Assest assest) {

       int loc = 0, flag = 0;
       try {
           for (int i = 0; i < assests.length; i++) {

               if (assests[i].equals(assest)) {

                   loc = i;
                   flag = 1;
               }
           }
       } catch (Exception e) {

       }

       if (flag == 1) {

           System.arraycopy(assests, loc + 1, assests, loc, assests.length - 1 - loc);

       } else {

           System.out.println("Assest not found!");
       }
   }

   /**
   * Prints the array.
   */
   public void printArray() {

       try {
           for (Assest assest : assests) {

               assest.print();
           }
       } catch (Exception e) {

       }
   }
}
/*****************************TestAssest.java*****************/

// TODO: Auto-generated Javadoc
/**
* The Class TestAsset.
*/
public class TestAsset {

   /**
   * The main method.
   *
   * @param args the arguments
   */
   public static void main(String[] args) {

       AssetManager mngr = new AssetManager();
       House house = new House("owned", 5, 5000, 4000, "JKS", 101);
       mngr.addAssest(house);
       mngr.addAssest(new House("owned", 5, 5000, 4000, "MS", 102));
       mngr.addAssest(new House("owned", 5, 5000, 4000, "Virat", 103));
       mngr.addAssest(new House("sold", 5, 5000, 4000, "JKS", 104));
       mngr.addAssest(new House("owned", 5, 5000, 4000, "JKS", 105));
       mngr.addAssest(new Vehicle("Hero", "top model", "2019", "MS", 106));
       mngr.addAssest(new Vehicle("Bajaj", "top model", "2018", "JKS", 107));
       mngr.addAssest(new Vehicle("Hero", "top model", "2017", "MS", 108));
       mngr.addAssest(new Vehicle("Hero", "top model", "2018", "Virat", 109));
       mngr.addAssest(new Vehicle("Hero", "top model", "2019", "JKS", 110));

       mngr.printArray();

       System.out.println("\nAfter selling\n");
       mngr.sellAssest(house);
       mngr.printArray();
   }
}
/**********************output***************/

House [erfNumber=0, location=null, noOfRooms=0, status=owned, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
House [erfNumber=0, location=null, noOfRooms=0, status=owned, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
House [erfNumber=0, location=null, noOfRooms=0, status=owned, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
House [erfNumber=0, location=null, noOfRooms=0, status=sold, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
House [erfNumber=0, location=null, noOfRooms=0, status=owned, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
Vehicle [make=Hero, model=top model, year=2019, price=0.0]
Vehicle [make=Bajaj, model=top model, year=2018, price=0.0]
Vehicle [make=Hero, model=top model, year=2017, price=0.0]
Vehicle [make=Hero, model=top model, year=2018, price=0.0]
Vehicle [make=Hero, model=top model, year=2019, price=0.0]

After selling

House [erfNumber=0, location=null, noOfRooms=0, status=owned, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
House [erfNumber=0, location=null, noOfRooms=0, status=owned, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
House [erfNumber=0, location=null, noOfRooms=0, status=sold, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
House [erfNumber=0, location=null, noOfRooms=0, status=owned, noOfYearsOwned=5, sellingPrice=5000.0, buyingPrice=4000.0]
Vehicle [make=Hero, model=top model, year=2019, price=0.0]
Vehicle [make=Bajaj, model=top model, year=2018, price=0.0]
Vehicle [make=Hero, model=top model, year=2017, price=0.0]
Vehicle [make=Hero, model=top model, year=2018, price=0.0]
Vehicle [make=Hero, model=top model, year=2019, price=0.0]

Please let me know if you have any doubt or modify the answer, Thanks :)