Practice Functional Programming In Java (22.1) - Lambda Expressions and Functional Interfaces

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9 questions

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6 sample questions

Question 1.
What is a lambda expression?
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Think about the syntax and purpose of lambda expressions.
Question 2.
Define a functional interface.
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Recall the main characteristic of a functional interface.
3Question 3.
What is a lambda expression primarily used for in Java?
- Implementing multiple interface methods
- Creating an anonymous function
- Declaring a class
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Consider what happens when you use a lambda expression.
4Question 4.
True or False: A functional interface can contain multiple abstract methods.
- True
- False
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Recall the definition of functional interfaces.
Question 5.
Create a functional interface with a method that calculates the area of a rectangle and implement it using a lambda expression.
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Remember to define both the interface and the lambda implementation.
Question 6.
Explain the role of 'final' and 'effectively final' in lambda expressions with an example.
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Consider how variable scope works in lambda expressions.

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