java collections interview questions

• What is Iterator and ListIterator in Java ?

Iterator in Java is used to traverse object inside a collection.
 Java Iterator allows you to easily access object stored in Collection.
List Iterator is bidirectional navigation technique.

• What is the Vector class?

The Vector class provides the capability to implement a growable array of objects.

• What is an Iterator interface?

The Iterator interface is used to step through the elements of a Collection

• What are the main implementations of the List interface ?

The main implementations of the List interface are as follows :

ArrayList : Resizable-array implementation of the List interface.
 The best all-around implementation of the List interface.

Vector : Synchronized resizable-array implementation of the List interface with additional "legacy methods."

LinkedList : Doubly-linked list implementation of the List interface.
May provide better performance than the ArrayList implementation if elements are frequently inserted or deleted within the list.
Useful for queues and double-ended queues (deques).

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