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4 cards from this section. Quick, good the night before a test.
What is the primary reason for using a Map in Java?
Think about how we access stored data.
Can a HashMap contain null values?
Consider what kind of data structures allow nulls.
Which of the following implementations of Map does not allow null keys?
Think about which implementation is synchronized.
True or False: TreeMap maintains the order of elements based on their natural ordering.
Reflect on how elements are stored in an ordered fashion.
You are building a contact management application. Which Map implementation would you choose and why?
Think about how contacts are accessed.
Data from a large data set must be stored in a sorted manner for quick retrieval. Which implementation should be chosen?
Consider how data will be organized and accessed.
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