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4 cards from this section. Quick, good the night before a test.
What does the put method do in a Map?
Think about what adding means in the context of storing values.
What will get('B') return if key 'B' does not exist in the Map?
Consider the behavior of retrieving a value that isn't there.
What does the put method do in a Map?
Think about adding new data vs. retrieving it.
True or False: The remove method returns null if the specified key does not exist in the Map.
Consider the way removal works without altering the structure adversely.
Write a Java program that simulates a simple phonebook using a Map. The program should allow adding, retrieving, and removing contact entries by phone number (key) and name (value).
Think about how you would structure your Map and what methods you would include.
Challenge to optimize a real-world application (like a bookstore) using Maps. Outline how you would handle inventory management with key-value pairs.
Reflect on how Maps can simplify data associations in complex applications.
5 more questions in this section. Enroll free to practise them all.
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