Practice Collection Hierarchy Recap (4.1.1) - Java Collections Framework (Advanced

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9 questions

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6 sample questions

Question 1.
What type of collection allows duplicates?
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Think about order and duplicates.
Question 2.
Name one implementation of Set.
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What prevents duplicates?
3Question 3.
Which collection type does not allow duplicates?
- List
- Set
- Map
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Remember the characteristics of each type.
4Question 4.
True or False: A TreeMap can contain null keys.
- True
- False
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Consider the sorting policy.
Question 5.
Design a data structure using Java Collections that needs to prevent duplicates, maintain order, and allow quick access. Explain your choice.
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Think about the balance of characteristics between Sets and Lists.
Question 6.
Write a Java program that demonstrates the difference between a HashMap and a TreeMap with respect to their ordering and retrieval practices.
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Consider how data organization might affect retrieval time.

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