mn cho e hỏi lỗi này là lỗi gì v ạ:
java.util.ConcurrentModificationException
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Nó là lỗi khi em sử dụng ArrayList hoặc HashMap hoặc HashSet để vừa đọc và vừa ghi trong môi trường đa luồng, để tránh lỗi này em có thể sử dụng CopyOnWriteArrayList hoặc ConcurrentHashMap hoặc var set = Collections.synchronizedSet(new HashSet()); nhé