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Posted 28 June 2007 - 06:41 PM
Here's an example using DVDs( I only need one of the two types of display, the easiest one!):
For my current code I have a CD class that represents a CD object, a CD2 subclass of CD I also have a CDInventory class that creates the CD objects and executes the methods in the CD class (driver class?). I have a hint about how to proceed from my instructor: "The CD and CD2 classes don't need to be modified, just the CDInventory class to include the GUI". In addition to the above mentioned classes I've created an additional class, GUICDInventory, to try and get the GUI to work but I keep getting this error:
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
I'm not sure why I'm getting the error or even if I'm headed in the right direction here...I'll work through it with anyone that wants to help me.
Here's my code:
// 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( Object[] gUICDInventory );
cDJList.setVisibleRowCount( 35 );
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, 800 );
guICDInventory.setVisible( true );
} // end main
} // end class GUICDInventory
// 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
This post has been edited by sammyboy78: 28 June 2007 - 06:45 PM
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