Practice Functional Interfaces (1.2) - Functional Programming in Java - Advance Programming In Java

Practice: Functional Interfaces

Lesson 1.2Functional Programming in Java

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8 questions

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6 sample questions

Question 1.
What does the @FunctionalInterface annotation signify?
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Consider its purpose in class definitions.
Question 2.
Name one built-in functional interface provided by Java.
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Think of interfaces related to threading or collections.
3Question 3.
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
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Reflect on what differentiates functional interfaces from regular interfaces.
4Question 4.
True or False: A functional interface can contain static methods.
- True
- False
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Consider the flexibility given to functional interfaces.
Question 5.
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.
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Focus on the functional interface structure and how to define inputs.
Question 6.
Create a list of strings, define a predicate functional interface to filter out strings longer than 3 characters, and print the results.
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Remember how predicates work with filtering streams.

4 more questions in this section. Enroll free to practise them all.