Nice work. I'm to lazy to create a trivia plugin... I probaly could if i wanted to, but i'm to damb lazy lol
You should compile it in a .jar file and post it on a website.
EDIT:Try using a java.util.HashMap for score keeping. A simple bit of code like:
myhashmap.put(user, score);
Will let you keep their score, automaticly replacing the old score with the new one. When you want to access the score, try:
if (myhashmap.containsKey(user)) {
int score = (int)myhashmap.get(user);
sendText(user + "'s score is " + score);
} else {
sendText(user + " hasn't played trivia.");
}