Question & Answer: You need to submit the solution to this UML (in Java). The driver must demonstrate, from all class…..

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RetailItem.java

public interface RetailItem {
/**
* Returns the retail price of this RetailItem object
* @return
*/
public double getRetailPrice();
}

Disc.java

/**
* The Disc represents any album by an artist and implements the RetailItem interface.
*
*/
public class Disc implements RetailItem {

private String title; //title of this disc
private String artist; //the artist of the album
private double retailPrice; //the retail price of the disc

/**
* Constructor to create the Disc object with the specified parameters
* @param title – the title of the album
* @param artist – the artist of the album
* @param retailPrice – the retail price of the disc
*/
public Disc(String title, String artist, double retailPrice)
{
this.title = title;
this.artist = artist;
this.retailPrice = retailPrice;
}

/**
* Returns the title of the disc
* @return the disc’s title
*/
public String getTitle()
{
return title;
}

/**
* Returns the artist of the album on disc
* @return – the name of the artist
*/

public String getArtist()
{
return artist;
}
@Override
public double getRetailPrice() {

return retailPrice;
}

}

Movie.java

/**
*
* A Movie class represent a movie on a DVD. The running time and price are stored
* along with the movie title. The running time is in mins.
* The Movie implements RetailItem interface
*
*/
public class Movie implements RetailItem {

private String title; //the title of the movie
private int runningTime; //the running time of movie in mins
private double retailPrice; //the retail price of the DVD

/**
* Constructor to initialize the Movie object
* @param dvdTitle – The title of the movie
* @param runTime – The running time of the movie in mins
* @param dvdPrice – The price of the DVD
*/
public Movie(String dvdTitle, int runTime, double dvdPrice)
{
this.title = dvdTitle;
this.runningTime = runTime;
this.retailPrice = dvdPrice;
}

/**
* Returns the title of the movie
* @return – movie title
*/
public String getTitle()
{
return title;
}

/**
* Returns the running time for the movie on DVD
* @return – running time in mins
*/
public int getRunningTime()
{
return runningTime;
}

@Override
public double getRetailPrice() {
return retailPrice;
}

}

RetailItemDemo.java

import java.util.Random;

public class RetailItemDemo {
/**
* Method to show the price of a RetailItem
* @param item – the retailItem object whose price should be displayed
*/
private static void showPrice(RetailItem item)
{
System.out.println(“Retail Price: $” + item.getRetailPrice());

}
public static void main(String[] args) {

Movie movie1 = new Movie(“Real Steel”, 127, 2.99);
Disc disc1 = new Disc(“Thriller”, “Michael Jackson”, 100);
System.out.println(“Displaying movie details-“);
System.out.println(“Movie Title: ” + movie1.getTitle());
showPrice(movie1);//since Movie implements RetailItem, we pass Movie object

System.out.println(“nDisplaying disc details-“);
System.out.println(“Disc Title: ” + disc1.getTitle());
System.out.println(“Artist: ” + disc1.getArtist());
showPrice(disc1);//since Disc implements RetailItem, we pass Disc object

//create 100,000 objects and time it
RetailItem[] items = new RetailItem[100000]; //RetailItem can store both Movie and Disc objects
Random random = new Random();

long startTime = System.currentTimeMillis();

//create 50000 movie objects
for(int i = 0; i < 50000; i++)
{
//create movies with running time between 60 – 120 mins and price 1.0 – 2.0
items[i] = new Movie(“Movie ” + i , 60 + random.nextInt(60), 1 + random.nextDouble());
}

//create 50000 movie objects
for(int i = 50000; i < 100000; i++)
{
//create discs with Artists0 – Artist9, and price between 1.0 – 2.0
items[i] = new Disc(“Disc ” + i , “Artist ” + random.nextInt(10), 1 + random.nextDouble());
}

long endTime = System.currentTimeMillis();
long elapsedTime = (endTime – startTime) ; //calculate elapsed time in milli secs
System.out.println(“nIt took ” + elapsedTime + ” milli secs to create 100,000 objects”);

}
}

output

Displaying movie details-
Movie Title: Real Steel
Retail Price: $2.99

Displaying disc details-
Disc Title: Thriller
Artist: Michael Jackson
Retail Price: $100.0

It took 84 milli secs to create 100,000 objects