Java Programming for Complete Beginners - Java 16 - Step 27 - TreeMap - Methods from NavigableMap - floorKey, higherKey,

The video tutorial introduces the TreeMap data structure, highlighting its sorted nature and the additional operations it offers through the NavigableMap interface. It covers methods like higherKey, lowerKey, firstEntry, and lastEntry, explaining their functionality. The tutorial also delves into subMap functionality, demonstrating how to retrieve subsets of data. The video concludes with recommendations to explore the methods of the NavigableMap interface further.

What is a key characteristic of a TreeMap?

• It allows duplicate keys.

• It maintains keys in sorted order.

• It does not allow null values.

• It is not synchronized.

Which method would you use to find the smallest key greater than a given key in a TreeMap?

• lowerKey

• floorKey

• higherKey

• ceilingKey

What does the ceilingKey method return?

• The largest key less than or equal to the given key

• The smallest key greater than or equal to the given key

• The largest key less than the given key

• The smallest key greater than the given key

How can you retrieve the first entry in a TreeMap?

• Using the method firstKey()

• Using the method getFirst()

• Using the method entrySet().first()

• Using the method firstEntry()

In a submap operation, what does it mean if the left boundary is inclusive?

• The submap excludes the key at the right boundary.

• The submap includes the key at the left boundary.

• The submap excludes the key at the left boundary.

• The submap includes the key at the right boundary.