Java Interview Guide : 200+ Interview Questions and Answers - Functional Programming Examples - Streams and Lambda Expre

The video introduces functional programming concepts in Java 8, focusing on Lambda expressions and streams. It contrasts traditional programming, which relies on state changes, with functional programming, which avoids state changes to facilitate multithreading. The video provides examples of summing odd numbers using both traditional and functional programming styles, highlighting the benefits of functional programming, such as easier scaling and multithreading.

What are some of the new concepts introduced in Java 8 related to functional programming?

• Inheritance and polymorphism

• Encapsulation and abstraction

• Pointers and memory management

• Lambda expressions and streams

In the traditional approach to summing odd numbers, what is the role of the 'sum' variable?

• It is used to store intermediate results as the loop progresses.

• It is a constant value throughout the program.

• It is used to filter out even numbers.

• It stores the final result without any intermediate changes.

Why is functional programming beneficial in a multithreaded environment?

• It enhances the use of global variables.

• It avoids changes to the state, reducing concurrency issues.

• It allows for dynamic memory allocation.

• It simplifies the use of pointers.

What is a key characteristic of functional programming?

• Frequent changes to variable states

• Avoidance of state changes

• Use of global variables

• Dependence on object-oriented principles

In functional programming, what is a 'stream'?

• A way to manage memory allocation

• A type of loop for iterating over collections

• A method of handling exceptions

• A sequence of elements supporting sequential and parallel operations

What is the purpose of a lambda expression in functional programming?

• To define anonymous functions

• To create classes

• To manage memory allocation

• To handle exceptions

How does the 'reduce' function operate in the context of functional programming?

• It sorts elements in ascending order.

• It multiplies all elements in a list.

• It combines elements to produce a single result.

• It filters out elements based on a condition.