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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is a functional interface?
💡 Hint: Think about interfaces and how many abstract methods they can have.
Question 2
Easy
Write a simple lambda expression that returns the square of an integer.
💡 Hint: Remember the syntax for a lambda expression!
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 immutability prevent in functional programming?
- State changes
- Function calls
- Data retrieval
💡 Hint: Think about how changing data affects functions.
Question 2
True or False: Lambda expressions can only be used in the context of functional interfaces.
- True
- False
💡 Hint: Recall the purpose of lambda expressions.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a Java program that applies several Stream operations: filter a list of names to those starting with 'A' then capitalize them and collect the results into a new list.
💡 Hint: Use filter and map operations appropriately.
Question 2
Design a method that takes an Optional string as input, returns its length if present, or returns 0 if absent.
💡 Hint: Use map for transforming and orElse for default values.
Challenge and get performance evaluation