15.5.2.3. TreeMap

Try these first

1. 1.

   What is a TreeMap in Java?

   Hint

   Consider its name. What does 'tree' and 'map' imply?

2. 2.

   Can TreeMap have null keys?

   Hint

   Think about how null might affect sorting.

3. 3.

   What kind of data structure does TreeMap use?

   • Array
   • LinkedList
   • Red-Black Tree
   • Hash Table

   Hint

   Think about how TreeMap keeps its elements sorted.

4. 4.

   True or False: TreeMaps allow null keys.

   • True
   • False

   Hint

   Recall the characteristics of TreeMap.

5. 5.

   Create a TreeMap with several fruit names as keys and their corresponding prices as values. Write code to retrieve the price of a specific fruit and handle the case where the fruit does not exist.

   Hint

   Consider how you check if a key exists in a map.

6. 6.

   Given a list of student scores, use a TreeMap to sort the scores and display them alongside their student names. Write appropriate code to achieve this.

   Hint

   Remember: the key is the score and the value is the student's name.