Java Programming for Complete Beginners - Java 16 - Step 19 - TreeSet - Methods from NavigableSet - floor, lower, upper,

This video tutorial explores the TreeSet in Java, focusing on its implementation of the NavigableSet interface. It covers the creation and initialization of a TreeSet, highlighting its sorted nature. The tutorial delves into various operations such as floor, lower, ceiling, and higher, which are unique to NavigableSet. It also demonstrates how to perform subset and range queries, and use headSet and tailSet methods. The video aims to provide a comprehensive understanding of TreeSet's capabilities and its advantages over other collection types.

What is a key feature of a TreeSet that differentiates it from a HashSet?

• It allows duplicate elements.

• It maintains elements in sorted order.

• It does not allow null elements.

• It is faster than a HashSet.

How do you typically create a TreeSet of integers?

• ArrayList numbers = new ArrayList<>();

• TreeSet numbers = new TreeSet<>();

• HashSet numbers = new HashSet<>();

• LinkedList numbers = new LinkedList<>();

Which method would you use to find the greatest element less than a given value in a TreeSet?

• floor()

• lower()

• ceiling()

• higher()

What does the floor method return when called with a value present in the TreeSet?

• The next higher value

• The same value

• Null

• The next lower value

Which method retrieves all elements greater than a specified value in a TreeSet?

• subSet()

• higher()

• tailSet()

• headSet()

How does the subset method treat the lower and upper bounds by default?

• Both are inclusive

• Both are exclusive

• Lower is inclusive, upper is exclusive

• Lower is exclusive, upper is inclusive

What does the headSet method do in a TreeSet?

• Returns all elements less than a specified value

• Returns the first element

• Returns all elements greater than a specified value

• Returns a subset between two values