Here is an update on my code since i havent posted here in a while.
My Product superclass. No compiler errors
package AssignmentTwo;
public abstract class Product{
protected String code;
protected String name;
protected double price;
protected String playingTime;
public Product(){
}
public Product(String code, String name, double price, String playingTime)
{
this.code = code;
this.name = name;
this.price = price;
this.playingTime = playingTime;
}
public void setCode(String c)
{
code = c;
}
public String getCode()
{
return code;
}
public void setName(String n)
{
name = n;
}
public String getName()
{
return name;
}
public void setPrice(double p)
{
price = p;
}
public double getPrice()
{
return price;
}
public void setPlayingTime(String t)
{
playingTime = t;
}
public String getPlayingTime()
{
return playingTime;
}
public String showInfo()
{
return this.code + "\t" + this.name + "\t" + this.price + "\t" + this.playingTime + "\t" ;
}
// protected abstract String showInfo();
My ProductList class. I get a compiler error at line 26. Saying the Product class cannot be instantiated. I know this, but how would I create a product then add it to the list if I can instantiate the Product class. I thought about doing it from the subclasses, either MusicCD or MovieDVD. But then I could only do one or the other, not both. I have marked the error in red.
package AssignmentTwo;
import java.util.*;
public class ProductList{
ArrayList products = new ArrayList();
public ProductList() {
}
public void add(Product p)
{//add a product to the list
String key = ((Product)p).getCode();
if(find(key) == null)
{
products.add(p);
}
}
public void add(String id, String name, double price, String playingTime)
{//create a Product and add it to the list
for(int i = 0 ; i<products.size(); i++)
{
Product prod1 = new Product(id,name,price, playingTime);//Cannot Instantiate Product
products.add(prod1);
}
}
public int size()
{//return how many are in the list
return products.size();
}
public Object get(int index)
{//return the Product at position index
return products.get(index);
}
public void remove(int index)
{//remove the Product at position index
products.remove(index);
}
public Object find(String find)
{//return a Product based on the ID#
Iterator it = products.iterator();
while(it.hasNext())
{
Product q = (Product)it.next();
if (q.getCode().equals(find))
{
return q;
}
}
return null;
}
public Iterator it()
{
return products.iterator();
}
public static void main(String[] args)
{
ProductList pr = new ProductList();
Product prod1 = new MusicCD("111","Highway to Hell",15,"1 Hour", "AC/DC", 11);
Product prod2 = new MusicCD("222","Back In Black",15,"3 Hours", "AC/DC", 17);
// Product prod3 = new MovieDVD("333","Rocky V",20,"2 Hours", "Stalone",);
pr.add(prod1);
pr.add(prod2);
// pr.add(prod3);
/*
Iterator it = pr.it();
while (it.hasNext())
{
Product p = (Product)it.next();
System.out.println(p.showInfo());
}*/
}
}
My MusicCD class. No compiler errors.
package AssignmentTwo;
public class MusicCD extends Product{
private String artist;
private int numberOfTracks;
public MusicCD()
{
artist="";
numberOfTracks = 0;
code= this.getCode();
name=this.getName();
price=this.getPrice();
playingTime=this.getPlayingTime();
}
public MusicCD(String code, String name, double price, String playingTime, String a, int n)
{
super(code, name, price , playingTime);
artist=a;
numberOfTracks = n;
}
public String getArtist()
{
return artist;
}
public void setArtist(String a)
{
artist=a;
}
public int getNumberOfTracks()
{
return numberOfTracks;
}
public void setNumberOfTracks(int n)
{
numberOfTracks = n;
}
public String showInfo(){
return this.getName() + " " + this.getPrice() + " " +
this.getPlayingTime()+ artist + " " + numberOfTracks + " " + this.getCode();
}
}
My MovieDVD class. No compiler errors.
package AssignmentTwo;
public class MovieDVD extends Product{
private String director;
private int scenes;
public MovieDVD()
{
director="";
scenes=0;
code= this.getCode();
name=this.getName();
price=this.getPrice();
playingTime=this.getPlayingTime();
}
public MovieDVD(String code, String name, double price, String playingTime, String d, int s)
{
super(code, name, price , playingTime);
director=d;
}
public String getDirector()
{
return director;
}
public void setDirector(String d)
{
director=d;
}
public int getScenes()
{
return scenes;
}
public void setScenes(int s)
{
scenes=s;
}
public String showInfo(){
return this.getCode()+" " + this.getName() + " " + this.getPrice() + " " +
this.getPlayingTime()+ director + " " + scenes ;
}
}
And finally my ProdTest class. No compiler errors.
package AssignmentTwo;
import java.util.*;
public class ProdTest {
public static void main(String[] args)
{
ProductList pr = new ProductList();
Iterator it = pr.it();
while (it.hasNext())
{
Product p = (Product)it.next();
System.out.println(p.showInfo());
}
}
}