Practice Custom Functional Interface Example (22.12) - Lambda Expressions and Functional Interfaces

Practice: Custom Functional Interface Example

Lesson 22.12Lambda Expressions and Functional Interfaces

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9 questions

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6 sample questions

Question 1.
Define a functional interface with a method 'calculate'.
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Use @FunctionalInterface annotation.
Question 2.
What does a lambda expression enable you to do?
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Think about how you might implement a new operation.
3Question 3.
What is a functional interface?
- An interface with multiple abstract methods
- An interface with exactly one abstract method
- An interface with no methods
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Remember the definition we covered.
4Question 4.
True or False: Lambda expressions can only call methods defined in the same class.
- True
- False
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Think about the scope of lambda expressions.
Question 5.
Create a functional interface 'Calculator' that can perform any mathematical operation such as addition, subtraction, multiplying, and division. Implement your interface using lambda expressions and test it with various operations.
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Consider designing each operation as a separate lambda expression.
Question 6.
Design an application that requires a functional interface to validate user input. Create a method that accepts a lambda for validation and uses it to check conditions like range and format.
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Think about the common criteria for user inputs.

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