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4 cards from this section. Quick, good the night before a test.
What data structure does ArrayList use to store its elements?
Think about dynamic arrays.
Can LinkedList store duplicate values?
Remember the properties of a list.
What is the main feature of ArrayList?
Which structure offers quick access to its elements?
True or False: A TreeMap allows null keys.
Consider how keys are organized in the map.
Design a simple library management system that requires both a fast lookup of books by borrower (use HashMap) and a sorted list of books by title (use TreeSet).
Use a combination of both collections to handle different requirements.
You are tasked with creating a chat room application. Which collection structure would you prefer for storing messages sent (the order matters) and why? Consider using both ArrayList and LinkedList for message history.
Think about how messages are added or removed during active conversations.
6 more questions in this section. Enroll free to practise them all.
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