Practice Map Interface - 15.5.1 | 15. Collections and Generics | Advanced Programming
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Map Interface

15.5.1 - Map Interface

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Learning

Practice Questions

Test your understanding with targeted questions

Question 1 Easy

What does the put method do in a Map?

💡 Hint: Think about how you would add an item to a list.

Question 2 Easy

True or False: A Map can have duplicate keys.

💡 Hint: Consider if you can have two identical names in a contact list.

4 more questions available

Interactive Quizzes

Quick quizzes to reinforce your learning

Question 1

Which of the following methods adds a key-value pair to a Map?

get()
put()
remove()

💡 Hint: Consider which option sounds like it relates to 'adding'.

Question 2

True or False: A TreeMap automatically sorts keys.

True
False

💡 Hint: Think about how trees grow: do they follow an order?

1 more question available

Challenge Problems

Push your limits with advanced challenges

Challenge 1 Hard

Create a method that counts the number of occurrences of each character in a string. Use a HashMap for this solution.

💡 Hint: Think about how you can check if a character already exists in your Map.

Challenge 2 Hard

Implement a contact manager using a LinkedHashMap where you can add, find, and update contacts based on unique names.

💡 Hint: Consider what happens when you want to look for a name: does order matter?

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