Question

Write a class Store which includes the attributes: store name, city. Write another class encapsulating an Art Gallery, which inherits from Store. An Art Gallery has the following additional attributes: how many paintings are sold every year and the number of artists submitting artwork.

Code the constructor, accessors, mutators, toString and equals method of the super class Store. Code the constructor, accessors and mutators for the subclass Art Gallery. In the Art Gallery class, also code a method returning the average number of paintings per artist for a year.

You should create a test class which creates 2 Art Gallery objects, then calls your set methods, get methods, toString and equals methods and the method to calculate the average paintings per artist for the Art Gallery objects.

please explain the equal methods too. I don't understand the equal method. how to write, why to write, and what does it do. thank you

Answer 1

Answer;

class Store
{
private String storeName;
private double taxRate;

public Store(String storeName,double taxRate)// constructor
{
  this.storeName = storeName;
  this.taxRate = taxRate;
}

public String toString()
{
  return "Store Name : "+storeName + " Tax Rate : "+taxRate;
}

public boolean equals(Store s)
{
if(this.getStoreName() == s.getStoreName() && this.taxRate == s.taxRate)
return true;
else
return false;
}

//get and set methods
public String getStoreName()
{
  return storeName;
}
public void setStoreName(String storeName)
{
  this.storeName = storeName;
}
public double getTaxRate()
{
  return taxRate;
}

public void setTaxRate(double taxRate)
{
  this.taxRate = taxRate;
}
}

class BookStore extends Store
{
private int booksSold;
private double avgPrice;

public BookStore(String name,double taxRate,int booksSold,double avgPrice)
{
super(name,taxRate); // call to base class constructor
this.booksSold = booksSold;
this.avgPrice = avgPrice;
}

public String toString()
{
return "Book"+super.toString() + " Number of books sold : "+booksSold +"   Average price per book : $"+avgPrice;

}

//get and set methods
public int getBooksSold()
{
return booksSold;
}

public void setBooksSold(int booksSold)
{
this.booksSold = booksSold;
}
public double getAvgPrice()
{
return avgPrice;
}
public void setAvgPrice(double avgPrice)
{
this.avgPrice = avgPrice;
}
public boolean equals(BookStore b)
{
if(this.getStoreName() == b.getStoreName() && this.getTaxRate() == b.getTaxRate() && this.booksSold == b.booksSold && this.avgPrice == b.avgPrice)
return true;
else
return false;
}

public double avgTaxPerYear()
{
return booksSold * getTaxRate();
}
}
class Test
{
public static void main (String[] args)
{
  Store store = new Store("More",18.5);
  System.out.println(store);
  
  BookStore bs1 = new BookStore("A Novel Idea",4.56,2000,123.65);
  System.out.println(bs1);
  
  BookStore bs2 = new BookStore("BookBerries",3.28,3005,99.45);
  System.out.println(bs2);
  
  System.out.println("Average tax per year : $"+ bs2.avgTaxPerYear());
  
  if(bs1.equals(bs2))
  System.out.println("Both book stores are same");
  else
  System.out.println("Book stores are not same ");
}
}

Output:

Store Name : More Tax Rate : 18.5
BookStore Name : A Novel Idea Tax Rate : 4.56 Number of books sold : 2000   Average price per book : $123.65
BookStore Name : BookBerries Tax Rate : 3.28 Number of books sold : 3005   Average price per book : $99.45
Average tax per year : $9856.4
Book stores are not same

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