Остальная часть кода...

Листинг 4.3. Остальная часть кода класса ShoppingCart (ShoppingCart.java)

// remove an item from the cart by product id public CartItem removeById( String s ){ CartItem ret = (CartItem)itemsById.get( s );
if( ret == null ) return null ; itemsById.remove(s);
// remove by key items.removeElement( ret );
return ret ; } // remove all CartItem for which the numberOrdered is zero // returns the count of items left public int removeEmptyItems(){ Enumeration keys = itemsById.keys();
while( keys.hasMoreElements()){ String key = (String)keys.nextElement();
CartItem ci = (CartItem)itemsById.get(key);


if( ci.getNumberOrdered() == 0 ){ removeById( key );
} } return items.size();
} // mainly for debugging public String toString() { StringBuffer sb = new StringBuffer( "ShoppingCart has " + items.size() + " items.\r\n" ) ; Enumeration e = items.elements();
while( e.hasMoreElements()){ sb.append("Item: ");
sb.append( e.nextElement().toString() );
sb.append("\r\n");
} return sb.toString();
} }

Содержание раздела

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