Multiple choice technology databases

Which class is optimized for key-based item retrieval for both small and large collections:

  1. OrderedDictionary class

  2. ListDictionary class

  3. HybridDictionary class

  4. Hashtable class
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The HybridDictionary class is optimized for both small and large collections by starting as a lightweight ListDictionary when the collection has few items, and automatically switching to a Hashtable as the collection grows. ListDictionary is only fast for small lists, while Hashtable has higher overhead.

AI explanation

To answer this question, you need to understand the characteristics and performance considerations of different classes in .NET for key-based item retrieval.

Option A) OrderedDictionary class - This class maintains the insertion order of its elements. While it allows key-based retrieval, it is not optimized for performance in terms of large collections. The time complexity for key-based retrieval is O(n) because it searches through the collection linearly.

Option B) ListDictionary class - This class is optimized for small collections. It uses a simple list-based approach for storing key-value pairs. While it allows key-based retrieval, it is not efficient for large collections. The time complexity for key-based retrieval is O(n) because it searches through the collection linearly.

Option C) HybridDictionary class - This class is optimized for both small and large collections. It internally uses different data structures based on the size of the collection. For small collections, it uses a ListDictionary, and for large collections, it switches to a Hashtable. The time complexity for key-based retrieval is O(1) for large collections and O(n) for small collections.

Option D) Hashtable class - This class is optimized for key-based retrieval in large collections. It uses a hash table data structure, which provides constant-time (O(1)) performance for key-based retrieval. It is efficient for both small and large collections.

The correct answer is Option C) HybridDictionary class. This class is optimized for key-based item retrieval for both small and large collections. It internally uses different data structures based on the collection size, providing efficient retrieval performance.

Keep practicing — related questions