import java.util.*;
import java.io.*;
public class buyCar implements Serializable
{
 Hashtable myGoods=new Hashtable();
 public void buyCar()
 {}
 public void addGoods(String Goods_id,int Goods_Count)
 {
  if(myGoods.containsKey(Goods_id))
  {
   int Temp_Count=((Integer)myGoods.get(Goods_id)).intValue();
   Temp_Count=Temp_Count+Goods_Count;
   myGoods.put(Goods_id,new Integer(Temp_Count));
  }
  else
  {
   myGoods.put(Goods_id,new Integer(Goods_Count));
  }
 }
 public boolean minusGoods(String Goods_id,int Goods_Count)
 {
  if(myGoods.containsKey(Goods_id))
  {
   int Temp_Count=((Integer)myGoods.get(Goods_id)).intValue();
   Temp_Count=Temp_Count-Goods_Count;
   if(Temp_Count<=0)
     deleteGoods(Goods_id);
   else
     myGoods.put(Goods_id,new Integer(Temp_Count));
   return true;
  }
  else
  {
   return false;
  }
 }
 public Hashtable listMyGoods()
 {
  return myGoods;
 }
 public boolean deleteGoods(String Goods_id)
 {
  if(myGoods.remove(Goods_id)==null)
    return false;
  else
    return true;
  }
 }