Зміст курсу
Java Data Structures
Java Data Structures
2. Additional Data Structures
Section 3 Summary
Great, you're one step closer to becoming a Java developer, as today you've completed another section.
Maps are a very useful data structure that allows you to store values in a key-value structure. This way, you can store data in an organized manner with fast access by key. Additionally, with the help of HashMap, you implemented an online store, which is quite good practice.
You're doing a fantastic job, and by moving forward at the same pace, you'll achieve unprecedented success in backend programming!
Now, a small quiz is prepared for you to recall the basic things you've learned in this section:
1. What is a `HashMap` in Java?
2. What is the average time complexity for basic operations (insertion, deletion, and retrieval) in a `HashMap`?
3. How does `HashMap` handle collisions?
4. Which of the following interfaces does `HashMap` implement in Java?
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