Practice Custom Functional Interface Example - 22.12 | 22. Lambda Expressions and Functional Interfaces | Advanced Programming
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22.12 - Custom Functional Interface Example

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

Define a functional interface with a method 'calculate'.

💡 Hint: Use @FunctionalInterface annotation.

Question 2

Easy

What does a lambda expression enable you to do?

💡 Hint: Think about how you might implement a new operation.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is a functional interface?

  • An interface with multiple abstract methods
  • An interface with exactly one abstract method
  • An interface with no methods

💡 Hint: Remember the definition we covered.

Question 2

True or False: Lambda expressions can only call methods defined in the same class.

  • True
  • False

💡 Hint: Think about the scope of lambda expressions.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

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.

💡 Hint: Consider designing each operation as a separate lambda expression.

Question 2

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.

💡 Hint: Think about the common criteria for user inputs.

Challenge and get performance evaluation