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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What are the four main types of collections in Java?
💡 Hint: Think about common collection usages.
Question 2
Easy
What is an ArrayList?
💡 Hint: Consider how it stores data.
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 collections allows duplicate elements?
- A. HashSet
- B. TreeSet
- C. ArrayList
- D. Map
💡 Hint: Think about how these collections store items.
Question 2
True or False: A TreeMap can have null keys.
- True
- False
💡 Hint: Consider how ordering affects nulls.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
You need to create a shopping cart in an e-commerce application. Which collection would you choose to store items and why?
💡 Hint: Consider the operations you need to perform.
Question 2
Assuming a banking system requires uniqueness in account numbers and needs to maintain their order, which collections would best suit this requirement?
💡 Hint: Think about uniqueness and order.
Challenge and get performance evaluation