4.3 - Working with Maps – Beyond the Basics
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Practice Questions
Test your understanding with targeted questions
What method of TreeMap retrieves the least entry greater than or equal to a specified key?
💡 Hint: Look for a method that provides the next highest entry.
Which map implementation maintains the order of insertion?
💡 Hint: Think about what type of access you would prefer with order.
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Interactive Quizzes
Quick quizzes to reinforce your learning
Which of the following methods is provided by NavigableMap?
💡 Hint: Think about methods that relate to order.
True or False: TreeMap allows null keys.
💡 Hint: Consider what would happen if two entries have undefined order.
1 more question available
Challenge Problems
Push your limits with advanced challenges
You are maintaining a contact list using a TreeMap that requires quick retrieval of nearest contacts starting with a certain letter. Write code to demonstrate how you'd achieve that.
💡 Hint: What function can help retrieve contacts starting with a particular letter efficiently?
Compare the efficiency of inserting 10,000 entries into a HashMap versus a TreeMap. Discuss the outcomes.
💡 Hint: Consider how the underlying structure impacts entry times.
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