invoiceitem.java

Java程序设计技巧与开发实例附书源代码。

public class InvoiceItem
    extends Item
{
   protected double total;

   public InvoiceItem(InventoryItem item,
                      int _units)
   {
      super(item.ID);
      desc = item.desc;
      price = item.price;
      units = _units;
      total = price * units;
   }

   public String toString()
   {
      return super.toString() + " = " +
          Util.dollar(total) +
          "\t(" + desc + ")";
   }
}