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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. Synchronization: Vector is synchronized, which means only one thread at a time can access the code, while ArrayList is not synchronized, which means multiple threads can work on ArrayList at the same time.Significant Differences between ArrayList and Vector: Vector is slow because it is synchronized, i.e., in a multithreading environment, it holds the other threads in a runnable or non-runnable state until the current thread releases the lock of the object.ĪrrayList uses the Iterator interface to traverse the elements. It is introduced in JDK 1.2.ĪrrayList is fast because it is non-synchronized. Vector increments 100% means doubles the array size if the total number of elements exceeds its capacity.ĪrrayList is not a legacy class. No.ĪrrayList increments 50% of the current array size if the number of elements exceeds ts capacity. Vector: Vector v = new Vector() Vector vs. Syntax: ArrayList: ArrayList al = new ArrayList() Vector is slow because it is synchronized, i.e., in a multithreading environment, it holds the other threads in runnable or non-runnable state until current thread releases the lock of the object.ĥ) ArrayList uses the Iterator interface to traverse the elements.Ī Vector can use the Iterator interface or Enumeration interface to traverse the elements.ĪrrayList and Vectors both implement the List interface, and both use (dynamically resizable) arrays for their internal data structure, much like using an ordinary array.

It is introduced in JDK 1.2.Ĥ) ArrayList is fast because it is non-synchronized. Vector increments 100% means doubles the array size if the total number of elements exceeds than its capacity.ģ) ArrayList is not a legacy class. 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.