JAVA设计模式english

				import java.util.*;
				
				public class productList extends JawtList
				{
				   public productList(Vector products)
				   {
				      super(products.size());    //for compatibility
				      for (int i = 0; i < products.size(); i++)
				      {
				         //take each strig apart and keep only
				         //the product names, discarding the quntities
				         String s = (String)products.elementAt(i);
				         int index = s.indexOf("--");  //separate qty from name
				         if(index > 0)
				            add(s.substring(0, index));
				         else
				            add(s);
				      }
				   }
				}