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Difference between Arraylist and Vector

Difference between Arraylist and Vector

There are a few key differences between Array lists and Vectors that you should know about before choosing which one to use in your program. The most important difference is that Array lists can grow and shrink as needed, while Vectors are fixed in size. This makes Arraylists a better choice for situations where you may not know how many items will be stored in the list. Additionally, Vector operations are generally faster than ArrayList operations, making them a better choice for high-performance applications. However, if memory usage is more important than performance, Arraylists are the better option.

What is Arraylist?

ArrayList is a part of the collection framework in Java. The arrayList class extends AbstractList and implements the List interface. ArrayList supports dynamic arrays that can grow as needed. A standard array in Java is a fixed-size array. After Array is created, we can not change the Array size. ArrayList in Java can be seen as similar to vector in C++. ArrayList implements the List interface so we can invoke all the methods defined in the List interface on ArrayList.

ArrayLists are created with an initial size. When this size is exceeded, the collection is automatically enlarged. When objects are removed, the array may be shrunk. ArrayList typically reduces the cost of insertion because it doesn’t force an extra copy when expanding capacity.ArrayList is not synchronized i.e. it is not suitable for use in a multithreaded environment unless that environment uses only a single thread for all access to ArrayLists.

What is Vector?

Vector is an exciting new technology that provides synchronized, real-time data across multiple devices. Vector delivers high-quality, low-latency data streams that are perfect for gaming, video conferencing, and other applications that require fast, accurate data. Vector is based on a unique peer-to-peer architecture that enables it to operate with minimal latency. Vector is also highly scalable, so it can easily support large numbers of users and devices. Vector is an ideal solution for any application that requires real-time data synchronization.

Difference between Arraylist and Vector

ArrayList and Vector both implement the List interface. ArrayList is backed by a dynamic array that can grow as needed, while Vector is backed by a synchronized array. ArrayList is not synchronized, while Vector is. ArrayList can only hold objects, while Vector can hold both objects and primitives. ArrayList is faster than Vector because ArrayList is not synchronized. Vector is slower than ArrayList because it is synchronized. ArrayList allows null elements, while Vector does not allow null elements. ArrayList uses an Iterator for traversal, while Vector uses an Enumeration for traversal. ArrayList is not legacy, while Vector is legacy. ArrayList can be used in the single-thread environment, while Vector cannot be used in a single-thread environment.


Array lists and vectors are both data structures that store a sequence of values. They have different performance characteristics, so it is important to choose the right one for your application. In general, array lists are better suited for applications that require frequent insertions and deletions, while vectors are better suited for applications that require fast random access.

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