1.2 - Functional Interfaces
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Practice Questions
Test your understanding with targeted questions
What does the @FunctionalInterface annotation signify?
💡 Hint: Consider its purpose in class definitions.
Name one built-in functional interface provided by Java.
💡 Hint: Think of interfaces related to threading or collections.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the main characteristic of a functional interface?
💡 Hint: Reflect on what differentiates functional interfaces from regular interfaces.
True or False: A functional interface can contain static methods.
💡 Hint: Consider the flexibility given to functional interfaces.
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Challenge Problems
Push your limits with advanced challenges
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.
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.
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