Java Interview Guide : 200+ Interview Questions and Answers - Map interfaces and implementations - HashMap, LinkedHashMa

The video provides an overview of the map interface, focusing on key-value pairs and essential methods. It explains the differences between sorted and navigable maps, highlighting their ordering capabilities and methods. The video also covers various map implementations, including hash map, hash table, and linked hash map, discussing their characteristics such as synchronization and ordering.

What is a primary feature of a map in terms of data storage?

• It stores data in a linear sequence.

• It uses a single key for multiple values.

• It stores data in a hierarchical structure.

• It uses key-value pairs for data storage.

How does a sorted map differ from a regular map?

• It is always synchronized.

• It does not support key-value pairs.

• It maintains the order of elements based on keys.

• It allows duplicate keys.

Which method is NOT typically associated with a navigable map?

• Creating submaps based on key ranges.

• Sorting elements by value.

• Retrieving the first and last keys.

• Finding a key lower than a given key.

What is a key difference between a hash map and a hash table?

• Hash tables maintain insertion order.

• Hash maps are always sorted.

• Hash maps do not allow null keys.

• Hash tables are synchronized, while hash maps are not.

What is a characteristic of a linked hash map?

• It is always sorted by keys.

• It maintains the insertion order of elements.

• It does not allow null values.

• It is faster than a hash map for all operations.