inventoryitem.java

Java程序设计技巧与开发实例附书源代码。

public class InventoryItem
    extends Item
{
   public InventoryItem(String _ID,
                        String _desc, double _price, int _units)
   {
      super(_ID);
      desc = _desc;
      price = _price;
      units = _units;
   }

   public void remove(int num)
   {
      units -= num;
   }

   public void add(int num)
   {
      units += num;
   }

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