Question

The Exercise Write a Java program that stores and retrieves details about a ``basket'' of items bought in a supermarket. Items should have a code, a name, and a price. Once created, it should be possible to change the price of an item, but not its name or code.

1. Write a class for individual items. Do not forget to include constructors, accessors and mutator methods as required.

2. Create another class to store a list of items (the shopping basket).This should include the use of a single collection for the storage of all individual items. This class should have a methods to:

a. add an item to the collection (this method should have multiple parameters - one per Item attribute);

b. return the total number of items in the basket;

c. print the index, name, item code, and price of each item to the console window.

3. Write a method to calculate and return the total cost of the shopping (the total price of all items in the basket).

4. Write a method that removes all items whose price is greater than some maximum (a parameter to the method).

Answer 1

SOURCE CODE:

/*package whatever //do not write package name here */

import java.util.*;

class Item
{
    final String itemName;
    final int code;
    double price;
    Item(String name,int code,double price)
    {
        this.itemName=name;
        this.code=code;
        this.price=price;
    }
  
}
class Basket
{
    ArrayList<Item> list=new ArrayList<Item>();
    public void add(String name,int code,double price)
    {
        list.add(new Item(name,code,price));
    }
  
    public int countItems()
    {
        return list.size();
    }
    public void printItems()
    {
        int index=1;
        for(Item i:list)
        {
            System.out.print("Index= "+index++);
            System.out.print(" Name= "+i.itemName);
            System.out.print(" Price= "+i.price);
            System.out.println(" CODE= "+i.code);
        }
    }
  
    public double totalCost()
    {
        double cost=0;
        for(Item i:list)
        {
            cost+=i.price;
        }
        return cost;
    }
  
    public void removeGT(double maxPrice)
    {
        for(int i=0;i<list.size();i++)
        {
           if(list.get(i).price>maxPrice)
            list.remove(i);
        }
    }
    public static void main(String[] args)
    {
        Basket b=new Basket();
        b.add("orange",123,10.00);
        b.add("grape",124,8.00);
        b.add("apple",125,40.50);
        b.add("banana",126,4.56);
        b.printItems();
      
      
        System.out.println("There are "+b.countItems()+" items in the basket");
        System.out.println("The total cost is "+b.totalCost());
        b.removeGT(20);
        System.out.println("Removed items greater than 20 rupees.");

        b.printItems();

    }
}

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SAMPLE OUTPUT:

Index= 1  Name= orange  Price= 10.0  CODE= 123
Index= 2  Name= grape  Price= 8.0  CODE= 124
Index= 3  Name= apple  Price= 40.5  CODE= 125
Index= 4  Name= banana  Price= 4.56  CODE= 126
There are 4 items in the basket
The total cost is 63.06
Removed items greater than 20 rupees.
Index= 1  Name= orange  Price= 10.0  CODE= 123
Index= 2  Name= grape  Price= 8.0  CODE= 124
Index= 3  Name= banana  Price= 4.56  CODE= 126

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SCREENSHOT FOR CODE:

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SCREENSHOT FOR OUTPUT:

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