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.

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 hasn't 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

Here's what I have for my driver class.

Code:
 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