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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is a lambda expression?
💡 Hint: Think about shorthand function implementations.
Question 2
Easy
What does the Optional class help prevent?
💡 Hint: Consider how you handle null values.
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 is a lambda expression?
- A way to declare a variable
- A shorthand representation of a method
- A type of collection
💡 Hint: It's related to functional interfaces.
Question 2
True or False: Optional helps manage nullable values.
- True
- False
💡 Hint: Think about what happens when a variable is null.
Solve 3 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a function that takes a list of strings and returns a list containing only those that have more than 3 characters. Use streams.
💡 Hint: Use the `filter()` method correctly.
Question 2
Write a pure function that accepts a list of integers and returns the sum, ensuring it does not alter the original list.
💡 Hint: Think about how to use reduce without modifying input.
Challenge and get performance evaluation