讨论hash键值的问题

C# code

Map map = new HashMap();
        map.put("www.aa.com", "www.aaa.com");
        map.put("b", "www.bbbb.com");
        Iterator<?> it = map.keySet().iterator();
        while(it.hasNext()){
            String s = (String)map.get(it.next());
            System.out.println(s);
        }
        map.remove("www.aa.com");
        while(it.hasNext()){
            String s = (String)map.get(it.next());
            System.out.println(s);
        }

www.bbbb.com作为键
为什么删不掉？

------解决方案--------------------
可以的

Map map = new HashMap();
map.put("www.aa.com", "www.aaa.com");
map.put("b", "www.bbbb.com");
Iterator<?> it = map.keySet().iterator();
while (it.hasNext())
{
String s = (String)map.get(it.next());
System.out.println("==" + s);
}

map.remove("www.aa.com");
it = map.keySet().iterator(); while (it.hasNext())
{
String s = (String)map.get(it.next());
System.out.println(s);
}