15.5.2.2. LinkedHashMap

Try these first

1. 1.

   What does a LinkedHashMap retain that a HashMap does not?

   Hint

   Think about how elements are added.

2. 2.

   Can you add null values in a LinkedHashMap?

   Hint

   Consider the rules for key-value pairs.

3. 3.

   What order does a LinkedHashMap maintain?

   • Random order
   • Order of keys
   • Insertion order

   Hint

   Think about how you would retrieve elements.

4. 4.

   True or False: LinkedHashMap allows more than one null key.

   • True
   • False

   Hint

   Recall the rules regarding keys.

5. 5.

   You have a LinkedHashMap that stores tasks with priority levels. How would you efficiently add tasks while maintaining their ordered priority?

   Hint

   Consider how to traverse the map while inserting.

6. 6.

   Implement a LinkedHashMap that counts the frequency of words from a given sentence but keeps track of insertion order. Provide a method to display words in insertion order.

   Hint

   Think about how you would loop through a LinkedHashMap.