Java Programming for Complete Beginners - Java 16 - Step 13 - Behind the Screens with Functional Interfaces - Implement

The video tutorial explores Lambda expressions in Java, focusing on their functionality behind the scenes. It explains how Lambda expressions work with functional interfaces, particularly the Predicate interface, and demonstrates filtering even numbers from a list using streams. The tutorial includes a practical example of implementing a custom Predicate interface to understand how Java handles Lambda expressions and functional interfaces.

What is the primary concept behind Lambda expressions in Java?

• Object-oriented programming

• Functional interfaces

• Inheritance

• Polymorphism

In the practical demonstration, what is the purpose of converting a list to a stream?

• To find the maximum element

• To reverse the list

• To filter elements based on a condition

• To sort the list

What does the filter method in a stream require as an argument?

• A Function

• A Supplier

• A Predicate

• A Comparator

What is the role of the test method in the predicate interface?

• To sort elements

• To check a condition and return a boolean

• To modify elements

• To convert elements to strings

How does the Java compiler handle Lambda expressions in terms of functional interfaces?

• It converts them to abstract classes

• It creates an implementation of the functional interface

• It ignores them

• It stores them as static methods

What is the main advantage of using Lambda expressions over explicit predicate implementations?

• They are more verbose

• They are slower to execute

• They require more memory

• They provide a concise way to implement functional interfaces

What is the primary function of a predicate in Java?

• To perform arithmetic operations

• To evaluate a condition and return true or false

• To manage input/output operations

• To handle exceptions