Answered Essay: We will create a web-based application to maintain products for an online music catalog

Problem

We will create a web-based application to maintain products for an online music catalog. Your task is to create a Java Bean that adheres to the following conventions:

has a zero-argument constructor

has properties whose values can only be accessed by accessor methods

is Serializable, that is, implements the java.io.Serializable interface.

Specification

The bean must have the following features:

Project Name

aaannn_HW2_ProductMaint,

where aaa – your initials, nnn – last 3 digits of your tech ID

Package Prefix

classes you create must be in packages that begin with the prefix:
edu.metrostate.ics425.aaannn.prodmaint

where aaa – your initials, nnn – last 3 digits of your tech ID

note: per Java coding conventions characters in the package name should be all lower-case

Class

Name: ProductBean.java

Implements: edu.metrostate.ics.prodmaint.model.Product

Properties:

Property Name	Type	Access	Description/ Notes
Code	String	R/W	Unique to each catalog entry
Description	String	R/W	Title of album
Price	double	R/W	Price of album
Release Date	java.time.LocalDate	R/W	Date album was released note: uses new Java8 time class
Years Released	int	RO	number of whole years from release date, or -1 if future release; -2 if no release date is set (i.e. releaseDate == null)

Overrides:

equals(Object) : so that products with the same code are equal (Case insensitive)

hashCode() : should almost always be overridden to comply with relationship with equals (see Javadoc on Object)

toString() : for convenience have it display something meaningful about the product

Note: no main method is specified or required

Demo App (optional)

So you can test your bean without using a main method, I would recommend creating a demo application with the following use-case:

System	User
1. Displays Product Entry Form	2. Enters product information and presses submit button
3. System creates new product 4. System gets product information from request and sets product values 5. System displays Product Information Form displaying new product
end of use case

Note: no validation is required for this test app

Provided:

edu.metrostate.ics425.Product.java – the Product interface. Note: do not change its package.

NOTE: this is Java Netbeans

Expert Answer

PROGRAM CODE:

import java.io.Serializable;

import java.time.LocalDate;

//Class product bean

public class ProductBean implements Serializable{

//private members of the class

private String Code;

private String Description;

private double price;

private LocalDate ReleaseDate;

private int YearsReleased;

//constructor that initializes members to default values

public ProductBean() {

Code = “”;

Description = “”;

price = 0;

ReleaseDate = null;

YearsReleased = -2;

}

//Accessor and mutator methods

public String getCode() {

return Code;

}

public void setCode(String code) {

Code = code;

}

public String getDescription() {

return Description;

}

public void setDescription(String description) {

Description = description;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

public LocalDate getReleaseDate() {

return ReleaseDate;

}

public void setReleaseDate(LocalDate releaseDate) {

ReleaseDate = releaseDate;

//updating years based on the release date

if(releaseDate.isAfter(LocalDate.now()))

YearsReleased = -1;

else

{

YearsReleased = LocalDate.now().getYear() – releaseDate.getYear();

}

//only accessor

public int getYearsReleased() {

return YearsReleased;

}

@Override

public boolean equals(Object obj) {

ProductBean prod = (ProductBean)obj;

if(Code.equalsIgnoreCase(prod.getCode()))

return true;

else return false;

}

@Override

public int hashCode() {

return Code.hashCode();

}

@Override

public String toString() {

String result = “Code: ” + Code + “nDescription: ” + Description + “nPrice: $” + price + “nRelease Date: ”

+ ReleaseDate + “nYears Released: “;

if(YearsReleased == -1)

result += “Yet to be released”;

else if(YearsReleased == -2)

result += “NIL”;

else result += YearsReleased;

return result;

}

//only for testing

public static void main(String args[])

{

ProductBean bean = new ProductBean();

bean.setCode(“RFH203”);

bean.setDescription(“New Year’s Eve”);

bean.setPrice(23);

bean.setReleaseDate(LocalDate.of(2011, 02, 21));

System.out.println(bean);

}

OUTPUT:

Answered Essay: We will create a web-based application to maintain products for an online music catalog

Expert Answer

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