解决ArrayList的ConcurrentModificationException

for (String blackListUsername : blackListUsernames) {
if (blackListUsername.startsWith("zz")) {
blackListUsernames.remove(blackListUsername);
}
}

List<String> userList = new ArrayList<>();
for (String blackListUsername : blackListUsernames) {
if (blackListUsername.startsWith("zz")) {
// blackListUsernames.remove(blackListUsername);
userList.add(blackListUsername);
}
}
blackListUsernames.removeAll(userList);