Question asked by visitor varinder gupta. Not sure why you need proof for this -- the JavaDoc for ArrayList states that it is not synchronized. Vector is synchronized while ArrayList is not synchronized. Vector is synchronized means it's method are synchronized , while ArrayList is not synchronized it means its method not. There are two ways to synchronize explicitly: - Vector has a default size of size 10, where as ArrayList has no default size. 1) First and most common difference between Vector vs ArrayList is that Vector is synchronized and thread-safe while ArrayList is neither Synchronized nor thread-safe. First letâs talk about the fact that Vector is synchronized and ArrayList is not. As we are aware that ArrayList is non-synchronized and should not be used in multi-thread environment without explicit synchronization. Now, What does that mean? Ans:) 1) Synchronization - ArrayList is not thread-safe whereas Vector is thread-safe. Furthermore, whether something is synchronized, doesn't make it better. Synchronization and thread safe means at a time only one thread can access the code. There are two basic differences that distinguish ArrayList and Vector is that Vector belongs to Legacy classes that were later reengineered to support the collection classes whereas, an ArrayList is a standard collection class. And the JavaDoc for Vector states that it is synchronized. In Vector class each method like add (), get (int i) is surrounded with a synchronized block and thus making Vector class thread-safe. Threadsafe: Yes: No: Growth: double its size: half of its size: Vector grows to double in size of its array when exceeds its size while adding , while ArrayList grows half i.e. Synchronization is not necessary if ⦠50% of its size. We have already discussed a bit about synchronization when we shared the tutorial on Vector vs ArrayList. Could any one tell me why we say arraylist is not synchronized where as vector are.. what does it mean saying they are synchronized or not.. i know the concept of synchronization but what does it mean in case of vectors.. Difference between the two: The main difference between Vector and ArrayList is that Vector is synchronized while ArrayList is not. In Vector class each method like add(), get(int i) is surrounded with a synchronized block and thus making Vector ⦠ArrayList gives better performance as it is non-synchronized. It simply means that when working on concurrent applications, we can use Vector without any addtional synchronization control implemented by developer using synchronized keyword. 06 ⦠It means if multiple thread try to access Vector same time they can do that without compromising Vector's internal state. Another important point is the dynamic allocation of the Vector, which is different from the ArrayList. If you are working in a single threaded environment (or the list is limited to a thread and never shared), use ArrayList. Vector is a synchronized collection and ArrayList is not. This post is to discuss how to synchronize ArrayList in Java. Being synchronized means that every operation is thread safe - if you use the same vector from two threads at the same time, they can't corrupt the state. This means that if you have an application that needs to be thread-safe at some point, use Vector and you will be guaranteed of thread safety. 2) Data growth - Internally, both the ArrayList and ⦠Another important difference is that ArrayList is non-synchronized on the other hand; Vector is synchronized. However, this makes it slower. Vector operations gives poor performance as they are thread-safe, the thread which works on Vector gets a lock on it which makes other thread wait till the lock is released. Differences between ArrayList and Vector: - Vector is synchronized where as ArrayList is not. So, if multiple threads access an ArrayList concurrently then we must externally synchronize the block of code which modifies the list either structurally or simply modifies an element.
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