Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take practice test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is a functional interface?
💡 Hint: Think about the definition of functional programming.
Question 2
Easy
Write a simple lambda expression that prints a greeting.
💡 Hint: You need to define an action that can be executed.
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 functional interface?
- An interface with multiple abstract methods
- An interface with one abstract method
- An interface with no methods
💡 Hint: Think about what defines a functional interface in Java.
Question 2
True or False: Lambda expressions can be used with any type of interface.
- True
- False
💡 Hint: Recall the characteristics of lambda expressions.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a functional interface that defines a method to transform a string to uppercase. Implement it with lambda, then use it to process a list of strings.
💡 Hint: You'll need to define an interface, a lambda expression, and then use a stream to apply it.
Question 2
Using the Stream API, write a method that takes a list of integer values and returns a list of doubled values only for those greater than 10.
💡 Hint: Make sure you filter before mapping to achieve the desired output.
Challenge and get performance evaluation