1.5.1 - Interface Description
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Practice Questions
Test your understanding with targeted questions
What is a functional interface?
💡 Hint: Recall the definition in your readings.
Give an example of a predefined functional interface.
💡 Hint: Think about what interfaces are found in java.util.function.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
True or False: A functional interface can have multiple abstract methods.
💡 Hint: Think about the definition of a functional interface.
Which of the following is a functional interface?
A) Runnable
B) Number
C) Random
💡 Hint: Recall the interfaces we covered.
1 more question available
Challenge Problems
Push your limits with advanced challenges
Implement a custom functional interface for a comparator, then sort an array using a lambda expression that utilizes your interface.
💡 Hint: Think about how to compare two values.
Design a functional interface that can be used for event handling in Java applications. Show its implementation in a button click action.
💡 Hint: How do you handle actions in Java GUI?
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