Need help displaying array of objects using a GUI

[sammyboy78]

I'm trying to display an array of objects using a GUI. My instructions are that the CD class and it's sublcass don't need to change I just need to modify class CDInventory to include the GUI. I'm not even sure if the way I've written this is going to work but anyway, I keep getting a compilation error that says:

C:\Documents and Settings\Sam\GUICDInventory.java:22: cannot find symbol
symbol : constructor JList(CDInventory)
location: class javax.swing.JList
cDJList = new JList( gUICDInventory );

Here's the code where I get the error:

// GUICDInventory.java
// uses CD class
import java.awt.FlowLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.JList;
import javax.swing.JScrollPane;
 
public class GUICDInventory extends JFrame
{
 
    CDInventory gUICDInventory = new CDInventory();
 
    private JList cDJList;
 
    public GUICDInventory()
    {
        super( "Compact Disc Inventory" );
        setLayout( new FlowLayout() );
 
        cDJList = new JList( gUICDInventory );
        cDJList.setVisibleRowCount( 25 );
 
        add( new JScrollPane( cDJList ) );
 
 
 
    }
 
    // executes application
  public static void main( String args[] )
    {
        GUICDInventory guICDInventory = new GUICDInventory();
        guICDInventory.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        guICDInventory.setSize( 500, 500 );
        guICDInventory.setVisible( true );
 
    } // end main
 
} // end class GUICDInventory

and the other classes:

// CDInventory.java
// uses CD class
 
public class CDInventory
{
 
    // executes application
    public static void main( String args[] )
    {
 
        CD completeCDInventory[] = new CD2[ 5 ]; // creates a new 5 element array
 
        // populates array with objects that implement CD
        completeCDInventory[ 0 ] = new CD2( "Sixpence None the Richer" , "D121401" , 12 , 11.99, 1990 );
        completeCDInventory[ 1 ] = new CD2( "Clear" , "D126413" , 10 , 10.99, 1998 );
        completeCDInventory[ 2 ] = new CD2( "NewsBoys: Love Liberty Disco" , "2438-51720-2" , 10 , 12.99, 1999 );
        completeCDInventory[ 3 ] = new CD2( "Skillet: Hey You, I Love Your Soul" , "D122966" , 9 , 9.99, 1998 );
        completeCDInventory[ 4 ] = new CD2( "Michael Sweet: Real" , "020831-1376-204" , 15 , 12.99, 1995 );
 
        double totalInventoryValue = CD.calculateTotalInventory( completeCDInventory ); //declares totalInventoryValue variable
 
        CD.displayTotalInventory( completeCDInventory ); //calls CD's display method
 
        System.out.println("Total Inventory Value is: " + totalInventoryValue);
 
        CD.sortedCDInventory( completeCDInventory ); // calls CD's sortedCDInventory method
 
        System.out.println("Total Inventory Value is: " + totalInventoryValue);
 
    } // end main
 
} // end class CDInventory

// CD2.java
// subclass of CD
 
public class CD2 extends CD
{
    protected int copyrightDate; // CDs copyright date variable declaration
    private double price2;
 
    // constructor
    public CD2( String title, String prodNumber, double numStock, double price, int copyrightDate )
    {
        // explicit call to superclass CD constructor
        super( title, prodNumber, numStock, price );
 
        this.copyrightDate = copyrightDate;
 
    }// end constructor
 
    public double getInventoryValue() // modified subclass method to add restocking fee
    {
        price2 = price + price * 0.05;
        return numStock * price2;
 
    } //end getInventoryValue
 
    public void displayInventory() // modified subclass display method
        {
 
            System.out.printf( "\n%-22s%s\n%-22s%d\n%-22s%s\n%-22s%.2f\n%-22s%s%.2f\n%-22s%s%.2f\n%-22s%s%.2f\n  \n" , "CD Title:", title, "Copyright Date:", copyrightDate, "Product Number:", prodNumber , "Number in Stock:", numStock , "CD Price:" , "$" , price , "Restocking fee (5%):", "$", price*0.05, "Inventory Value:" , "$" , getInventoryValue() );
 
        } // end method
 
 
}//end class CD2

// CD.java
// Represents a compact disc object
import java.util.Arrays;
 
class CD implements Comparable
{
    protected String title; // CD title (name of product)
    protected String prodNumber; // CD product number
    protected double numStock; // CD stock number
    protected double price; // price of CD
    protected double inventoryValue; //number of units in stock times price of each unit
 
 
    // constructor initializes CD information
    public CD( String title, String prodNumber, double numStock, double price )
    {
        this.title = title; // Artist: album name
        this.prodNumber = prodNumber; //product number
        this.numStock = numStock; // number of CDs in stock
        this.price = price; //price per CD
 
    } // end constructor
 
    public double getInventoryValue()
    {
        return numStock * price;
 
    } //end getInventoryValue
 
    public void displayInventory()
    {
 
        System.out.printf( "\n%s%35s\n%s%12s\n%s%9.2f\n%s%12s%.2f\n%s%.2f\n%s%5s%.2f\n  \n" , "CD Title:", title, "Product Number:", prodNumber , "Number in Stock:", numStock , "CD Price:" , "$" , price , "Restocking fee (5%):", price*0.05, "Inventory Value:" , "$" , getInventoryValue() );
 
    } // end method
 
    public static double calculateTotalInventory( CD completeCDInventory[] )
    {
        double totalInventoryValue = 0;
 
        for ( int count = 0; count < completeCDInventory.length; count++ )
        {
             totalInventoryValue += completeCDInventory[count].getInventoryValue();
 
        } // end for
 
        return totalInventoryValue;
 
    } // end calculateTotalInventory
 
 
    public static void displayTotalInventory( CD completeCDInventory[] )
    {
        System.out.printf( "\n%s\n" ,"Inventory of CDs (unsorted):" );
 
        for ( int count = 0; count < completeCDInventory.length; count++ )
        {
            System.out.printf( "%s%d", "Item# ", count + 1 );
 
            completeCDInventory[count].displayInventory();
 
        }// end for
 
    }// end displayTotalInventory
 
    public int compareTo( Object obj ) //overlaod compareTo method
    {
        CD tmp = ( CD )obj;
 
        if( this.title.compareTo( tmp.title ) < 0 )
        {
            return -1; //instance lt received
        }
        else if( this.title.compareTo( tmp.title ) > 0 )
        {
            return 1; //instance gt received
        }
 
        return 0; //instance == received
 
        }// end compareTo method
 
    public static void sortedCDInventory( CD completeCDInventory[] )
    {
           System.out.printf( "\n%s\n" ,"Inventory of CDs (sorted by title):" );
 
           Arrays.sort( completeCDInventory ); // sort array
 
           for( int count = 0; count < completeCDInventory.length; count++ )
           {
                System.out.printf( "%s%d", "Item# ", count + 1 );
 
                   completeCDInventory[count].displayInventory();}
           }
 
 
} // end class CD

[r035198x]

Read the docs for JList and see where you're doing it wrong. Notice especially it's constructors.

[sammyboy78]

I read about the constructors and it looks like I need this one:

public JList(Object[] listData) Constructs a JList that displays the elements in the specified array. This constructor just delegates to the ListModel constructor.

Parameters:
listData - the array of Objects to be loaded into the data model

But, I'm not sure how to use it. If I do this:

cDJList = new JList( Object[] gUICDInventory );
cDJList.setVisibleRowCount( 25 );

I get this error message:

C:\Documents and Settings\Sam\GUICDInventory.java:22: '.class' expected
cDJList = new JList( Object[] gUICDInventory );
^
C:\Documents and Settings\Sam\GUICDInventory.java:22: ';' expected
cDJList = new JList( Object[] gUICDInventory );
^
2 errors

[r035198x]

I read about the constructors and it looks like I need this one:

public JList(Object[] listData) Constructs a JList that displays the elements in the specified array. This constructor just delegates to the ListModel constructor.

Parameters:
listData - the array of Objects to be loaded into the data model

But, I'm not sure how to use it. If I do this:

cDJList = new JList( Object[] gUICDInventory );
cDJList.setVisibleRowCount( 25 );

I get this error message:

C:\Documents and Settings\Sam\GUICDInventory.java:22: '.class' expected
cDJList = new JList( Object[] gUICDInventory );
^
C:\Documents and Settings\Sam\GUICDInventory.java:22: ';' expected
cDJList = new JList( Object[] gUICDInventory );
^
2 errors

Don't try to guess how to use it, read the swing tutorial.