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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
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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the primary purpose of a Set?
💡 Hint: Think about its uniqueness characteristic.
Question 2
Easy
Name one class that implements the List interface.
💡 Hint: Recall the types of lists.
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
What method retrieves the first key greater than or equal to a given key in a NavigableMap?
- floorEntry()
- ceilingEntry()
- higherEntry()
💡 Hint: Think about what you want to achieve with the key bounds.
Question 2
True or False: The ArrayList is synchronized by default.
- True
- False
💡 Hint: Consider the default nature of collections.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Design a method that takes a List of Employees and returns a List sorted by their years of experience in descending order. Explain your thought process.
💡 Hint: Consider how you would reverse the order of sorting.
Question 2
Build a thread-safe user registration system using ConcurrentHashMap where user emails are the keys. Discuss potential pitfalls.
💡 Hint: Think about how concurrent modifications to the map could affect your data integrity.
Challenge and get performance evaluation