Practice Deep Dive Into Collection Interfaces (4.1) - Java Collections Framework (Advanced

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8 questions

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Exercise
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6 sample questions

Question 1.
What are the four main types of collections in Java?
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Think about common collection usages.
Question 2.
What is an ArrayList?
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Consider how it stores data.
3Question 3.
Which of the following collections allows duplicate elements?
- A. HashSet
- B. TreeSet
- C. ArrayList
- D. Map
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Think about how these collections store items.
4Question 4.
True or False: A TreeMap can have null keys.
- True
- False
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Consider how ordering affects nulls.
Question 5.
You need to create a shopping cart in an e-commerce application. Which collection would you choose to store items and why?
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Consider the operations you need to perform.
Question 6.
Assuming a banking system requires uniqueness in account numbers and needs to maintain their order, which collections would best suit this requirement?
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Think about uniqueness and order.

4 more questions in this section. Enroll free to practise them all.