对哈希表执行包含操作

Question

I have a hashtable "listUserEvents' which is of the form string,vector. I am trying to see if the hashtable has some data for the given string or not.

listUserEvents = getUserInfo();
for (int i = 0; i < compareEventData.size(); i++) {
          EventData eventForExistingDate = (EventData) compareEventData.elementAt(i);
//here i want to check if listUserEvents  the hashtable has eventForExistingDate.getSummary() for string "hello"
}

how to perform this?

Answer 1

If I understand the question correctly, you just want:

if (listUserEvents.containsKey("hello"))
{
    ...
}

Your description isn't very clear though, as now we're not using eventForExistingDate ...

Note that if you use generic collections, you're unlikely to need the cast in the previous line.