Java Programming for Complete Beginners - Java 16 - Step 25 - Map Interface - Comparison - HashMap Versus LinkedHashMap

The video tutorial covers three implementations of the Map interface: HashMap, LinkedHashMap, and TreeMap. It explains the characteristics and differences of each, such as HashMap's efficiency due to its lack of order, LinkedHashMap's maintenance of insertion order, and TreeMap's sorting of keys. The tutorial concludes with exercises to count character and word occurrences in a string using programming, encouraging viewers to apply the concepts learned.

Which of the following is a characteristic of HashMap?

• Maintains insertion order

• Stores keys in sorted order

• Does not maintain any order

• Is slower than other map implementations

What is a key feature of LinkedHashMap?

• It does not allow null keys

• It sorts keys in natural order

• It maintains the order of insertion

• It is more efficient than HashMap

Which map implementation would you choose if you need to maintain the order of insertion?

• TreeMap

• HashMap

• LinkedHashMap

• None of the above

How does TreeMap store its keys?

• In the order they were inserted

• In a random order

• In a sorted order

• In reverse order

What exercise is suggested at the end of the video?

• Sorting a list of numbers

• Creating a new data structure

• Counting occurrences of characters and words in a string

• Implementing a new map interface