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 does the put method do in a Map?
💡 Hint: Think about how you would add an item to a list.
Question 2
Easy
True or False: A Map can have duplicate keys.
💡 Hint: Consider if you can have two identical names in a contact list.
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 of the following methods adds a key-value pair to a Map?
- get()
- put()
- remove()
💡 Hint: Consider which option sounds like it relates to 'adding'.
Question 2
True or False: A TreeMap automatically sorts keys.
- True
- False
💡 Hint: Think about how trees grow: do they follow an order?
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a method that counts the number of occurrences of each character in a string. Use a HashMap for this solution.
💡 Hint: Think about how you can check if a character already exists in your Map.
Question 2
Implement a contact manager using a LinkedHashMap where you can add, find, and update contacts based on unique names.
💡 Hint: Consider what happens when you want to look for a name: does order matter?
Challenge and get performance evaluation