Difference : ArrayList Vs Vector

Given below are the parameters on which ArrayList and Vector differs from each other :

1.      Synchronization :

ArrayList is non-synchronized. It is for same reason that multiple threads can operate on ArrayList at the same time.

Vector is synchronized. It is for same reason that two threads cannot get hold of a vector at the same time. If one thread is executing an operation on vector, other thread needs to wait till the executing thread releases it.

2.      Performance :

ArrayList is better performance-wise. As you know by now, ArrayList is non-synchronized so multiple threads can work on ArrayList at the same time.

Vector lags performance wise when compared to ArrayList. Vector is thread-safe. When a thread is performing any operation on Vector then it gets a lock. If other thread wants to perform operation on same Vector then it needs to wait until the Vector is unlocked (released) by thread in action.

3.      Size :

ArrayList grows by half of its size, if required.

Vector grows by double of its size, if required.

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