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Thread: Class Creating Help

  1. #1
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    Default Class Creating Help

    I just started a Java class a few weeks ago and we're learning to create our own classes. I think I understand it a little, but I cannot figure out why I can't get the class to multiply the price of an item by the quantity. It either always equals 0.00, or i get a <identifier> expected error. Any help would be great. Thanks!

    public class Invoice
    {
    	//Part Number
    	private String partNumber;
     
    	public void setPartNumber( String name )
    	{
    		partNumber = name;
    	}
    	public String getPartNumber()
    	{
    		return partNumber;
    	} //End Number
    	//Part Description
    	private String partDesc;
     
    	public void setPartDesc( String name )
    	{
    		partDesc = name;
    	}
    	public String getPartDesc()
    	{
    		return partDesc;
    	} //End Description
    	//Quantity
    	public int partQuantity;
     
    	public void setPartQuantity( int name )
    	{
    		partQuantity = name;
    	}
    	public int getPartQuantity()
    	{
    		return partQuantity;
    	} //End Quantity
    	//Part Price
    	public double partPrice;
     
    	public void setPartPrice( double name )
    	{
    		partPrice = name;
    	}
    	public double getPartPrice()
    	{
    		return partPrice;
    	} //End Price
    	//Calculate Invoice Amount
     
    	double amount = partQuantity * partPrice;
     
    	//End Amount
     
    	//Output
    	public void displayMessage()
    	{
    		System.out.printf("Part Number: %s\n", getPartNumber() );
    		System.out.printf("Part Description: %s\n", getPartDesc() );
    		System.out.printf("Part Quantity: %d\n", getPartQuantity() );
    		System.out.printf("Part Price: %.2f\n", getPartPrice() );
    		System.out.printf("Total Invoice Amount: %.2f\n", amount );	
    	}
    }


    import java.util.Scanner;
     
    public class InvoiceTest
    {
    	public static void main(String[] args)
    	{
    		Scanner input = new Scanner( System.in );
    		int theQuantity;
    		double thePrice;
     
    		Invoice myInvoice = new Invoice();
    		//Get and Set Part Number
    		System.out.println("Please enter the part number: ");
    		String theNum = input.nextLine();
    		myInvoice.setPartNumber( theNum );
    		//Get and Set Part Description
    		System.out.println("Please enter the part description: ");
    		String theDesc = input.nextLine();
    		myInvoice.setPartDesc( theDesc );
    		//Get and Set Part Quantity
    		System.out.println("Please enter the part quantity: ");
    		theQuantity = input.nextInt();
    		myInvoice.setPartQuantity( theQuantity );
    		//Get and Set Part Price
    		System.out.println("Please enter the part price: ");
    		thePrice = input.nextDouble();
    		myInvoice.setPartPrice( thePrice );
     
    		myInvoice.displayMessage();
    	}
    }


  2. #2
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    Default Re: Class Creating Help

    double amount = partQuantity * partPrice;

    You have that outside of a method. It's probably confused what to do with it.

    How about this:
     
    public double getAmount()
    {
    return (getPartPrice() * getPartQuantity());
    }

    And later in getMessage()

    System.out.printf("Total Invoice Amount: %.2f\n", getAmount() );
    Last edited by javapenguin; February 1st, 2011 at 11:29 PM.

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