What is the purpose of vector Java?

Answer 1

Vector is a type of collection object that Java has. Vector is a class that implements the AbstractList class and is often used as an alternative to arrays since it automatically extends the length of the list unlike arrays. A Vector can contain a collection of objects of any type. But it has fallen out of use due to the rise of the more convenient ArrayList class, but Vectors are still used for their security in multi threaded environment. Vectors are thread safe but array lists are not. An important fact to note is that Stack extends the Vector class.

Answer 2

it depends on the factor of usage patterns

Both the arraylist and vector are good for retrieving elements from a specific position in the container or for adding and removing elements from the end of the container. All of these operations can be performed in constant time -- O(1). However, adding and removing elements from any other position proves more expensive -- linear to be exact: O(n-i), where n is the number of elements and i is the index of the element added or removed. These operations are more expensive because you have to shift all elements at index i and higher over by one element. So what does this all mean?

It means that if you want to index elements or add and remove elements at the end of the array, use either a Vector or anArrayList. If you want to do anything else to the contents, go find yourself another container class. For example, theLinkedList can add or remove an element at any position in constant time -- O(1). However, indexing an element is a bit slower -- O(i) where i is the index of the element. Traversing an ArrayList is also easier since you can simply use an index instead of having to create an iterator. The LinkedList also creates an internal object for each element inserted. So you have to be aware of the extra garbage being created.

Answer 3

The purpose of vector Java is to make more Java possibilities for mobile and uniformed devices. The makers of Java said that they wanted to "revolutionize" the way that Java works and helps around the globe.

Answer 4

Java has something called vectors, but I believe the term "vector space" is more a math term than a Java term. A vector space is basically the collection of all possible vectors of one type.