

ArrayList is unsynchronized and not thread-safe, whereas Vectors are.Note: ArrayList is preferable when there is no specific requirement to use vector. Applications: Most of the time, programmers prefer ArrayList over Vector because ArrayList can be synchronized explicitly using Collections.synchronizedList.Traversal: Vector can use both Enumeration and Iterator for traversing over vector elements, while ArrayList can only use Iterator for traversing.ArrayList increments 50% of the current array size if the number of elements exceeds its capacity, while vector increments 100% – essentially doubling the current array size. Data Growth: ArrayList and Vector both grow and shrink dynamically to maintain optimal use of storage – but the way they resize is different.

Since it is non-synchronized, while vector operations give slower performance since they are synchronized (thread-safe), if one thread works on a vector, it has acquired a lock on it, which forces any other thread wanting to work on it to have to wait until the lock is released. Setting the value of an existing element is not a structural modification. Structural modification means the addition or deletion of element(s) from the list.
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For example, if one thread is performing an add operation, then there can be another thread performing a remove operation in a multithreading environment.If multiple threads access ArrayList concurrently, then we must synchronize the block of the code which modifies the list structurally or allow simple element modifications.

ArrayListĢ) ArrayList increments 50% of current array size if the number of elements exceeds from its capacity. However, there are many differences between ArrayList and Vector classes that are given below. Difference between ArrayList and Vector in Java.Differences between ArrayList and Vector in Java.Difference between ArrayList and Vector.
