Java Programming

while(childItr.hasNext()){
Peer child = childItr.next();

child.myClientSession.myPeers.add(contactMsg.source);
}

The code above gave me a Concurrent Modification Exception at line >>Peer child = childItr.next();
Then, I simply added the below line in between the two lines in the while
child = child;

The bug is fixed.. But it intrigues me..
What would have happened given that myPeers is a HashSet and this code runs within a method of the same 'Peer' class

thanks
vinoth