Java Programming for Complete Beginners - Java 16 - Step 05 - Functional Programming - Collect - Sum of Numbers in a Lis

This video tutorial explores functional programming by demonstrating how to calculate the sum of a list of numbers. It begins with setting up a basic list and printing its elements. The tutorial then contrasts traditional sum calculation using loops with a functional programming approach using the reduce function. The video concludes with an exercise to find the sum of odd numbers, encouraging viewers to apply the concepts learned.

What is the first step in setting up a list of integers in Java?

• Import the Java util list.

• Create a new class.

• Define a main method.

• Initialize a new array.

Which method is used to print each element of a list in Java?

• System.out.println()

• list.print()

• numbers.stream()

• System.out.print()

What is the initial value used in the traditional sum calculation?

• 0

• 1

• The first element of the list

• The last element of the list

What is the purpose of refactoring the sum calculation into a function?

• To change the programming language

• To make the code more readable and reusable

• To increase the execution speed

• To reduce the number of lines of code

In functional programming, what does the reduce function do?

• It multiplies all elements of a list.

• It filters out even numbers.

• It sorts the list in ascending order.

• It reduces a list to a single value by applying a function.

What is the starting value used in the reduce function for sum calculation?

• The last element of the list

• 0

• The first element of the list

• 1

What exercise is suggested at the end of the video?

• Multiply all numbers in the list.

• Find the sum of only the odd numbers in the list.

• Sort the list in descending order.

• Find the sum of all even numbers in the list.