Practice Functional Interfaces - 1.2 | 17. Functional Programming in Java | Advance Programming In Java
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1.2 - Functional Interfaces

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does the @FunctionalInterface annotation signify?

💡 Hint: Consider its purpose in class definitions.

Question 2

Easy

Name one built-in functional interface provided by Java.

💡 Hint: Think of interfaces related to threading or collections.

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 the main characteristic of a functional interface?

  • It can have multiple abstract methods
  • It must have exactly one abstract method
  • It cannot have default methods

💡 Hint: Reflect on what differentiates functional interfaces from regular interfaces.

Question 2

True or False: A functional interface can contain static methods.

  • True
  • False

💡 Hint: Consider the flexibility given to functional interfaces.

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Design and implement a functional interface named StringProcessor that takes a string and returns its length. Then, create a lambda expression to implement this interface.

💡 Hint: Focus on the functional interface structure and how to define inputs.

Question 2

Create a list of strings, define a predicate functional interface to filter out strings longer than 3 characters, and print the results.

💡 Hint: Remember how predicates work with filtering streams.

Challenge and get performance evaluation