Thread: Write a driver program implementing an ArrayList of CD object

I have written the CDException class and the CD class, and now I'm trying to write a driver class to run the other classes. I have to

Read the artist name from user
Read the album name from user
Read the price from user
Read how many in stock from user

And print what they wrote but only the valid entries. Other entries will be ignored upon printing if they just enter blanks.

Here's what I have for my CD class

import java.text.*;
public class CD {
 
private String sArtist;
private String sAlbum;
private double dPrice = 0;
private int inStock = 0;
String decimalFormats = "$##.##";   
 
    public CD(String sArtist, String sAlbum, double dPrice, int inStock) throws Exception{//constructors
 
        this.setArtist(sArtist);
        this.setAlbum(sAlbum);
        this.setPrice(dPrice);
        this.setinStock(inStock);
    }
        public String toString( ){//to string method
 
            DecimalFormat df = new DecimalFormat(decimalFormats);   //Formats the price
            String s = "Album: " + sAlbum + "\nArtist: " + sArtist +
                "\nPrice: " + df.format(dPrice);
 
            if(inStock == 0)
                return "Album: " + sAlbum + "\nArtist: " + sArtist +
                "\nPrice: $" + dPrice + "\nNot in Stock"; 
            else
                return s + "\nCurrently " + inStock + " in stock";
        }
 
        //mutator methods
        public void setArtist(String newArtist)throws Exception{
            if(newArtist.length( ) == 0){
                CDException cde = new CDException( );
                cde.setMessage("Artist name contains no characters" + "\nCannot create CD");
                throw cde;
            }
            else{
                this.sArtist = newArtist;
            }
        }
        public void setAlbum(String newAlbum) throws Exception{
            if(newAlbum.length( ) == 0){
                CDException cde = new CDException( );
                cde.setMessage("Album name contains no characters" + "\nCannot create CD");
                throw cde;
            }
            else{
                this.sAlbum = newAlbum;
            }
        }
        public void setPrice(double newPrice)throws Exception{
            if(newPrice < 0){
                CDException cde = new CDException( );
                cde.setMessage("CD Price cannot be negative" + "\nCannot create CD");
                throw cde;
            }
            else{
                this.dPrice = newPrice;
            }
        }
        public void setinStock(int newInStock)throws Exception{
            if(newInStock < 0){
                CDException cde = new CDException( );
                cde.setMessage("In stock cannot be negative" + "\nCannot create CD");
                throw cde;
            }
            else{
                this.inStock = newInStock;
            }
        }
 
 
 
        public String getsArtist( ){
            return this.sArtist;
        }
        public String getsAlbum( ){
            return this.sAlbum;
        }
        public double getdPrice( ){
            return this.dPrice;
        }
        public int getinStock( ){
            return this.inStock;
        }
 
    }   
}

And here is my Driver class, It needs to be modified so that way I can ask the user to enter the Artist name, album name, price of CD and how many in stock and wrap it up to add it into an ArrayList. If the user enters blanks, those will be ignored upon printing them. Only valid entries will be printed. I also have a CDException class that I wrote as well. This is frustrating me, any help would be much appreciated! I am very new to Java, so please bear with me as I may seem like I dont know what I'm talking about or doing.

 public class CDStore{
 
  public static void main (String[ ] arg) throws Exception{
 
   ArrayList (CD) CD = new ArrayList( );
 
   try{
         CD cd1 = new CD("Muse", "The Resistance", 11.99, 20);
         System.out.println(cd1.toString( ));
         System.out.println("=========================");
   }
   catch(CDException cde){
        System.out.println(cde.getMessage( ));
        System.out.println("=========================");
   }
 
  try{
       CD cd2 = new CD("Yanni", "The Live at the Acropolis", 11.99, 0);
       System.out.println(cd2.toString( ));
       System.out.println("=========================");
   }
  catch(CDException cde){
      System.out.println(cde.getMessage( ));
      System.out.println("=========================");
  }
 
 
  try{
       CD cd3 = new CD("Muse", "Black Holes and Revelations", 10.99, 15);
       System.out.println(cd3.toString( ));
       System.out.println("=========================");
   }
  catch(CDException cde){
       System.out.println(cde.getMessage( ));
       System.out.println("=========================");
 }
 
 try{ 
      CD cd4 = new CD("Paul Mc Cartney", "All the Best", -0.99, 12);
      System.out.println(cd4.toString( ));  
      System.out.println("=========================");
   }
 catch(CDException cde){
      System.out.println(cde.getMessage( ));
      System.out.println("=========================");
  }
 
  try{
      CD cd5 = new CD("Lady Gaga", "The Fame Monster", 14.99, 44);
      System.out.println(cd5.toString( ));
      System.out.println("=========================");
   }
  catch(CDException cde){
      System.out.println(cde.getMessage( ));
      System.out.println("=========================");
  }    
 
 
 
  try{
      CD cd6 = new CD("", "California Gurls", 1.29, 4);
      System.out.println(cd6.toString( ));
      System.out.println("=========================");
   }
  catch(CDException cde){
      System.out.println(cde.getMessage( ));
      System.out.println("=========================");
  }    
 
try{   
      CD cd7 = new CD("Pitbull", "", 11.99, 12);
      System.out.println(cd7.toString( ));
      System.out.println("=========================");
   }
 catch(CDException cde){
      System.out.println(cde.getMessage( ));
      System.out.println("=========================");
   }    
 
  }//main method ends
 
 } //program ends

I haven't learned what the JOptionPane is. I know I have to use the scanner. But I have three different classes, the exception, CD class, and the driver class. And I have my constructors in the CD class, but when I attempted to enter the questions in the driver such as

System.out.print("Enter Artist name: ");
sArtist = reader.nextLine( );

sArtist is the constructor in the CD class, and when I try to use it in the driver, it says it hasnt been declared or something like that. How do I link these all three classes, or how would I go about assigning the sArtist to what the user enters? Do i have to re-declare it in the driver as well even tho I done so in the CD class?

This is what pops up. I thought that all the classes would be linked? Hmm.

CDStore2.java:12: cannot find symbol
symbol : variable sArtist
location: class CDStore2
sArtist = reader.nextLine( );
^
Note: CDStore2.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error

----jGRASP wedge2: exit code for process is 1.

But my attempted modification looks like this, but isn't working. Should I declare new variables in this class and then wrap it up and then add it to the ArrayList?

import java.util.*;
public class CDStore2{
 
   public static void main (String[ ] arg) throws Exception{
 
		Scanner reader = new Scanner (System.in);
		ArrayList <CD> CD = new ArrayList( );
 
		System.out.print("Enter artist name: ");
		sArtist = reader.nextLine( );
 
 
 
   }//main method ends
 
} //program ends

Well, my class names are CD class, CDException and CDStore

The constructor names are sArtist, sAlbum, dPrice, and inStock

I cannot change the names, per my instructor.

Which is why I asked, those variables are declared in my CD class, and I'm trying to assign them a new name in the driver class with the user's input. Am i supposed to re-declare them in the driver class as well?

Well, like I stated before as well, I am very new to Java, this being my first course in it. So please bear with me as I may seem like I don't know what I'm doing or saying for that matter.

My two codes are posted up above.

So, what I would just have to do is declare the variables inside the driver class as well?