Practice Common Methods - 15.5.3 | 15. Collections and Generics | Advanced Programming
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15.5.3 - Common Methods

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does the put method do in a Map?

💡 Hint: Think about what adding means in the context of storing values.

Question 2

Easy

What will get('B') return if key 'B' does not exist in the Map?

💡 Hint: Consider the behavior of retrieving a value that isn't there.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does the put method do in a Map?

  • Retrieves a value
  • Adds or updates a key-value pair
  • Removes an entry

💡 Hint: Think about adding new data vs. retrieving it.

Question 2

True or False: The remove method returns null if the specified key does not exist in the Map.

  • True
  • False

💡 Hint: Consider the way removal works without altering the structure adversely.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

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).

💡 Hint: Think about how you would structure your Map and what methods you would include.

Question 2

Challenge to optimize a real-world application (like a bookstore) using Maps. Outline how you would handle inventory management with key-value pairs.

💡 Hint: Reflect on how Maps can simplify data associations in complex applications.

Challenge and get performance evaluation