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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
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// uses CD class
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import java.awt.FlowLayout;
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import javax.swing.JFrame;
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import javax.swing.JLabel;
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import javax.swing.SwingConstants;
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import javax.swing.JList;
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import javax.swing.JScrollPane;
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public class GUICDInventory extends JFrame
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{
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CDInventory gUICDInventory = new CDInventory();
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private JList cDJList;
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public GUICDInventory()
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{
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super( "Compact Disc Inventory" );
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setLayout( new FlowLayout() );
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cDJList = new JList( gUICDInventory );
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cDJList.setVisibleRowCount( 25 );
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add( new JScrollPane( cDJList ) );
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}
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// executes application
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public static void main( String args[] )
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{
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GUICDInventory guICDInventory = new GUICDInventory();
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guICDInventory.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
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guICDInventory.setSize( 500, 500 );
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guICDInventory.setVisible( true );
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} // end main
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} // end class GUICDInventory
and the other classes: - // CDInventory.java
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// uses CD class
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public class CDInventory
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{
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// executes application
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public static void main( String args[] )
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{
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CD completeCDInventory[] = new CD2[ 5 ]; // creates a new 5 element array
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// populates array with objects that implement CD
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completeCDInventory[ 0 ] = new CD2( "Sixpence None the Richer" , "D121401" , 12 , 11.99, 1990 );
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completeCDInventory[ 1 ] = new CD2( "Clear" , "D126413" , 10 , 10.99, 1998 );
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completeCDInventory[ 2 ] = new CD2( "NewsBoys: Love Liberty Disco" , "2438-51720-2" , 10 , 12.99, 1999 );
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completeCDInventory[ 3 ] = new CD2( "Skillet: Hey You, I Love Your Soul" , "D122966" , 9 , 9.99, 1998 );
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completeCDInventory[ 4 ] = new CD2( "Michael Sweet: Real" , "020831-1376-204" , 15 , 12.99, 1995 );
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double totalInventoryValue = CD.calculateTotalInventory( completeCDInventory ); //declares totalInventoryValue variable
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CD.displayTotalInventory( completeCDInventory ); //calls CD's display method
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System.out.println("Total Inventory Value is: " + totalInventoryValue);
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CD.sortedCDInventory( completeCDInventory ); // calls CD's sortedCDInventory method
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System.out.println("Total Inventory Value is: " + totalInventoryValue);
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} // end main
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} // end class CDInventory
- // CD2.java
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// subclass of CD
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public class CD2 extends CD
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{
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protected int copyrightDate; // CDs copyright date variable declaration
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private double price2;
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// constructor
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public CD2( String title, String prodNumber, double numStock, double price, int copyrightDate )
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{
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// explicit call to superclass CD constructor
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super( title, prodNumber, numStock, price );
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this.copyrightDate = copyrightDate;
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}// end constructor
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public double getInventoryValue() // modified subclass method to add restocking fee
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{
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price2 = price + price * 0.05;
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return numStock * price2;
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} //end getInventoryValue
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public void displayInventory() // modified subclass display method
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{
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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() );
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} // end method
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}//end class CD2
- // CD.java
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// Represents a compact disc object
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import java.util.Arrays;
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class CD implements Comparable
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{
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protected String title; // CD title (name of product)
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protected String prodNumber; // CD product number
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protected double numStock; // CD stock number
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protected double price; // price of CD
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protected double inventoryValue; //number of units in stock times price of each unit
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// constructor initializes CD information
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public CD( String title, String prodNumber, double numStock, double price )
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{
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this.title = title; // Artist: album name
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this.prodNumber = prodNumber; //product number
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this.numStock = numStock; // number of CDs in stock
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this.price = price; //price per CD
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} // end constructor
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public double getInventoryValue()
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{
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return numStock * price;
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} //end getInventoryValue
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public void displayInventory()
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{
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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() );
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} // end method
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public static double calculateTotalInventory( CD completeCDInventory[] )
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{
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double totalInventoryValue = 0;
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for ( int count = 0; count < completeCDInventory.length; count++ )
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{
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totalInventoryValue += completeCDInventory[count].getInventoryValue();
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} // end for
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return totalInventoryValue;
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} // end calculateTotalInventory
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public static void displayTotalInventory( CD completeCDInventory[] )
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{
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System.out.printf( "\n%s\n" ,"Inventory of CDs (unsorted):" );
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for ( int count = 0; count < completeCDInventory.length; count++ )
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{
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System.out.printf( "%s%d", "Item# ", count + 1 );
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completeCDInventory[count].displayInventory();
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}// end for
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}// end displayTotalInventory
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public int compareTo( Object obj ) //overlaod compareTo method
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{
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CD tmp = ( CD )obj;
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if( this.title.compareTo( tmp.title ) < 0 )
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{
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return -1; //instance lt received
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}
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else if( this.title.compareTo( tmp.title ) > 0 )
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{
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return 1; //instance gt received
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}
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return 0; //instance == received
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}// end compareTo method
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public static void sortedCDInventory( CD completeCDInventory[] )
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{
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System.out.printf( "\n%s\n" ,"Inventory of CDs (sorted by title):" );
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Arrays.sort( completeCDInventory ); // sort array
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for( int count = 0; count < completeCDInventory.length; count++ )
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{
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System.out.printf( "%s%d", "Item# ", count + 1 );
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completeCDInventory[count].displayInventory();}
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}
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} // end class CD
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