#Tumblr vector code how to#

Only one thread can call methods on a Vector at a time, which is a slight overhead, but helpful when safety is a concern.

ArrayList is unsynchronized and not thread-safe, whereas Vectors are.

#Tumblr vector code how to#

(' Vector elements are:') Ĭode How to choose between ArrayList and Vector? Java Program to illustrate use of ArrayListĪl.add('') Traversal: Vector can use both Enumeration and Iterator for traversing over elements of vector 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.

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.ĭata Growth: ArrayList and Vector both grow and shrink dynamically to maintain optimal use of storage – but the way they resize is different. Performance: ArrayList is faster, since it is non-synchronized, while vector operations give slower performance since they are synchronized (thread-safe).Setting the value of an existing element is not a structural modification. Structural modification means addition or deletion of an element(s) from the list. If multiple threads access ArrayList concurrently, then we must synchronize the block of the code which modifies the list structurally or alternatively allows simple element modifications. For example, if one thread is performing an add operation, then there can be another thread performing a remove operation in a multithreading environment. 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.Major Differences between ArrayList and Vector: ArrayList and Vectors both implement the List interface and both use (dynamically resizable) arrays for its internal data structure, much like using an ordinary array.