Java Interview Guide : 200+ Interview Questions and Answers - Functional Programming Questions and Answers

The video tutorial introduces functional programming, a paradigm that treats computation as the evaluation of mathematical functions, avoiding mutable data. It explains streams, intermediate and terminal operations, and demonstrates the use of lambda expressions and method references. The tutorial also covers functional interfaces like predicate, consumer, and binary operator, highlighting their relationship with lambda expressions. The video concludes with exercises to practice functional programming concepts.

What is the primary characteristic of functional programming?

• It allows mutable data.

• It focuses on object-oriented design.

• It treats computation as the evaluation of mathematical functions.

• It relies heavily on loops and conditionals.

In functional programming, what is a stream?

• A type of variable.

• A source of objects that can be processed.

• A sequence of characters.

• A method for sorting data.

Which of the following is an example of an intermediate operation in streams?

• Print

• Reduce

• Collect

• Filter

What is a Lambda expression?

• A class in Java.

• A type of loop.

• A way to define anonymous functions.

• A method for sorting arrays.

What does the 'map' operation do in a stream?

• Combines elements into a single result.

• Transforms each element to another form.

• Sorts elements in ascending order.

• Filters out elements based on a condition.

What is the purpose of a method reference?

• To define a new variable.

• To provide a shortcut for Lambda expressions.

• To create a new class.

• To execute a loop.

How can method references simplify code?

• By eliminating the need for classes.

• By reducing the number of variables.

• By reusing existing methods in a concise way.

• By increasing the number of lines of code.

What is a functional interface?

• An interface with multiple methods.

• A type of variable.

• An interface with exactly one abstract method.

• A class with no methods.

Which functional interface is used to represent a function that takes one argument and returns a result?

• Predicate

• Supplier

• Consumer

• Function

What is the relationship between Lambda expressions and functional interfaces?

• Lambda expressions replace functional interfaces.

• Functional interfaces are used to define Lambda expressions.

• Lambda expressions are unrelated to functional interfaces.

• Lambda expressions are used to implement functional interfaces.