Thread: 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();
	}
}