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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
Define a functional interface for a simple greeter method.
💡 Hint: Remember it should have a single abstract method.
Question 2
Easy
Write a short lambda expression that prints 'Hello World!'
💡 Hint: Think of the basic structure of a lambda.
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 without methods
💡 Hint: Remember the definition from our lessons.
Question 2
True or False: Lambda expressions can have multiple statements?
- True
- False
💡 Hint: Review the syntax of lambda expressions we discussed.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Design a simple functional interface for a multiplier and implement it using a lambda expression that takes two integers and returns their product.
💡 Hint: Think about the structure of a functional interface.
Question 2
Create a list of strings and use a Stream API operation to find and print all strings that contain the letter 'a'.
💡 Hint: Use 'filter' to narrow down the strings.
Challenge and get performance evaluation