Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What type of collection allows duplicates?
💡 Hint: Think about order and duplicates.
Question 2
Easy
Name one implementation of Set.
💡 Hint: What prevents duplicates?
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
Which collection type does not allow duplicates?
- List
- Set
- Map
💡 Hint: Remember the characteristics of each type.
Question 2
True or False: A TreeMap can contain null keys.
- True
- False
💡 Hint: Consider the sorting policy.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Design a data structure using Java Collections that needs to prevent duplicates, maintain order, and allow quick access. Explain your choice.
💡 Hint: Think about the balance of characteristics between Sets and Lists.
Question 2
Write a Java program that demonstrates the difference between a HashMap and a TreeMap with respect to their ordering and retrieval practices.
💡 Hint: Consider how data organization might affect retrieval time.
Challenge and get performance evaluation