Collections

Question 1

ArrayList

Answer 1

An ArrayList implements several interfaces. The size of an arraylist dynamically increases according to the number of items added.

Question 2

Hashtable

Answer 2

A Hashtable is the set of keys and value pairs in a collection and is organized depending on that key. The key is the number that references the value in the list of data.

Question 3

Queue

Answer 3

A Queue symbolizes a first-in, first-out collection of objects.

Question 4

Stack

Answer 4

A Stack signifies last-in-first-out (LIFO) collection of objects.

Question 5

ICollection

Answer 5

All collection classes can access the ICollection interface. The ICollection is an interface for collections of similar objects like the controls on a form, the elements in a list and so on. The ICollection interface provides all features needed for a collection such as count, CopyTo etc.

Question 6

IList

Answer 6

IList is a successor of the ICollection interface and is the base interface of all lists that hold the same set of data. Lists can be fixed or variable lengths or read-only.

Question 7

IDictionary

Answer 7

Used for collection classes that uses key/value-based collection. The IDictionary interface is the base interface for collection of key/value pairs. Each key/value pair must have a unique key.

Question 8

Ordered collection

Answer 8

Items in the collection are stored in a specific order.

Question 9

Indexed collection

Answer 9

Items in the collection are identified by a numeric index.

Question 10

Keyed collection

Answer 10

Items in the collection are identified by a unique key value.