Java Programming for Complete Beginners - Java 16 - Step 15 - Behind the Screens with Functional Interfaces - Implement

The video tutorial explores the map method and its background, focusing on how it processes even numbers to produce their squares. It delves into the concept of functional interfaces, particularly the map interface, and explains how these interfaces work behind the scenes. The tutorial provides a practical example by implementing a square mapper class, demonstrating the application of the function interface. It concludes with an overview of key functional interfaces, including function, predicate, and consumer, highlighting their roles in functional programming.

What is the primary purpose of the map method discussed in the video?

• To map even numbers to their squares

• To sort numbers in ascending order

• To filter out odd numbers

• To find the maximum number in a list

What does the function interface do?

• It takes an input and consumes it without returning

• It takes an input and returns an output

• It takes two inputs and returns a single output

• It takes an input and returns a boolean

In the implementation of the apply method, what operation is performed on the input number?

• It is divided by two

• It is squared

• It is converted to a string

• It is incremented by one

Which functional interface is used to determine if a condition is true or false?

• Predicate

• Function

• Consumer

• Supplier

What is the role of a consumer interface?

• To supply a new value

• To take an input and consume it without returning anything

• To take an input and return an output

• To return a boolean value