Vector 问题

Question

package lesson;
import javax.servlet.http.*;
import java.util.Vector;
import java.util.Enumeration;public class Carts{ Vector v = new Vector();
String submit = null;
String item = null;
private void addItem(String name)
{
if(name!=null)
 v.addElement(name);
}private void removeItem(String name)
{
  v.removeElement(name);
}public void setItem(String name)
{
 item=name;
}public void setSubmit(String s)
{
submit=s;
}
public String[] getItems()
{
String[] s = new String[v.size()];
v.copyInto(s);
return s;
}public void processRequest(HttpServletRequest request)
{
 if(submit==null)
addItem(item);
else if(submit.equals("add"))
addItem(item);
else if(submit.equals("remove"))
removeItem(item);
reset();}private void reset()
{
submit=null;
item=null;
}
}
  警告：对作为普通类型 java.util.Vector 的成员的 addElement(E) 的调用未经检查
   v.addElement(name);
               ^
1:  警告求解

Answer 1

Vector<String> v = new Vector<String>();v.add((String)name);试试看