Purpose To    review    abstract    classes    and    polymorphism Directions The    total    cost    of    a    group    of    items    at    a    grocery    store    is    based    on    the    sum    of    the     individual    product    prices    and    the    tax    (which    is    5.75%).    Products    that    are    considered     “necessities”    are    not    taxed,    whereas    products    that    are    considered    “luxuries”    are.     For    this    practice    problem you    will    need    to    download    Shopping    Trip    Starting     Code.zip    from    Pilot. The    Product    class    is    abstract,    and    it    has    a    method    called    getTotalPrice.    Your    task    is     to    create    two    subclasses    of    Product:    NecessaryProduct    and    LuxuryProduct    and     implement    the    getTotalPrice method    in    each    of    these    classes    appropriately.    Then     modify    the    driver    program    to    instantiate    four    products    (two    necessary    and    two     luxury)    and    store    them    in    the    product    array,    print    out    each    item    in    the    array,    and     display    the    total    cost    of    the    items. You    should    not    make    any    changes    at    all    to    Product.java,    and    you    should    only    add    to     ShoppingTripStartingCode.java.    Do    not    change    any    code    that    is    already    present. Example (Cheese    and    bread    are    necessities    and    soda    and    candy    are    luxuries) Cheese $1.50 Soda $3.50 Bread $2.25 Candy $2.00 The total cost is $9.57 The    computation    is    1.50    +    (3.50    *    1.0575)    +    2.25    +    (2.00    *    1.0575) =    9.57.    Note    that     the    price    displayed    next    to    each    product    is    the    price    without    tax. Keep    in    mind    that    to    receive    credit    your    code    needs    to    work    for    all    valid    inputs,    not     just    for    the    particular    example    shown    above. Given code: public abstract class Product {     private String name;     private double price;     public Product(String name, double price) {         this.name = name;         this.price = price;     }     @Override     public String toString() {         return String.format("%s $%.2f", name, price);     }     public double getPrice() {         return price;     }     public abstract double getTotalPrice(); }   public class ShoppingTripStartingCode {     public static void main(String[] args) {         Product[] products = new Product[4];         // TODO create two necessary and two luxury products and add them to         // the products array         double total = 0;         for (Product p : products) {             // TODO print out each product             total += p.getTotalPrice();         }         // TODO display the total cost, rounded to the nearest cent     } }

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Purpose
To    review    abstract    classes    and    polymorphism
Directions
The    total    cost    of    a    group    of    items    at    a    grocery    store    is    based    on    the    sum    of    the    
individual    product    prices    and    the    tax    (which    is    5.75%).    Products    that    are    considered    
“necessities”    are    not    taxed,    whereas    products    that    are    considered    “luxuries”    are.    
For    this    practice    problem you    will    need    to    download    Shopping    Trip    Starting    
Code.zip    from    Pilot.
The    Product    class    is    abstract,    and    it    has    a    method    called    getTotalPrice.    Your    task    is    
to    create    two    subclasses    of    Product:    NecessaryProduct    and    LuxuryProduct    and    
implement    the    getTotalPrice method    in    each    of    these    classes    appropriately.    Then    
modify    the    driver    program    to    instantiate    four    products    (two    necessary    and    two    
luxury)    and    store    them    in    the    product    array,    print    out    each    item    in    the    array,    and    
display    the    total    cost    of    the    items.
You    should    not    make    any    changes    at    all    to    Product.java,    and    you    should    only    add    to    
ShoppingTripStartingCode.java.    Do    not    change    any    code    that    is    already    present.
Example
(Cheese    and    bread    are    necessities    and    soda    and    candy    are    luxuries)
Cheese $1.50
Soda $3.50
Bread $2.25
Candy $2.00
The total cost is $9.57
The    computation    is    1.50    +    (3.50    *    1.0575)    +    2.25    +    (2.00    *    1.0575) =    9.57.    Note    that    
the    price    displayed    next    to    each    product    is    the    price    without    tax.
Keep    in    mind    that    to    receive    credit    your    code    needs    to    work    for    all    valid    inputs,    not    
just    for    the    particular    example    shown    above.

Given code:

public abstract class Product {

    private String name;
    private double price;

    public Product(String name, double price) {
        this.name = name;
        this.price = price;
    }

    @Override
    public String toString() {
        return String.format("%s $%.2f", name, price);
    }

    public double getPrice() {
        return price;
    }

    public abstract double getTotalPrice();
}
 
public class ShoppingTripStartingCode {

    public static void main(String[] args) {

        Product[] products = new Product[4];

        // TODO create two necessary and two luxury products and add them to
        // the products array
        double total = 0;
        for (Product p : products) {
            // TODO print out each product
            total += p.getTotalPrice();
        }

        // TODO display the total cost, rounded to the nearest cent
    }

}
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