Java Programming for Complete Beginners - Java 16 - Step 17 - Functions are First Class Citizens

The video tutorial discusses the core principles of functional programming, emphasizing the importance of treating functions as first-class citizens. It covers three main operations: storing functions in variables, passing functions to methods, and returning functions from methods. The tutorial uses Java to demonstrate these concepts, highlighting the role of functional interfaces in enabling these operations. Through examples, the video illustrates how to implement these techniques, reinforcing the idea that functions can be manipulated like any other data type in functional programming.

What is a key characteristic of functional programming discussed in the video?

• Functions are not used at all.

• Functions cannot be passed to other methods.

• Functions cannot be stored in variables.

• Functions are treated as first-class citizens.

Which of the following is NOT one of the three main capabilities of functions in functional programming?

• Storing functions in variables

• Creating functions without parameters

• Passing functions to methods

• Returning functions from methods

How can you store a function in a variable in Java?

• By using a constant

• By using a loop

• By using a predicate

• By using a class

What is the purpose of extracting a method in the context of functional programming?

• To create a new class

• To return a function from a method

• To delete a function

• To pass a function to another method

What enables the magic of storing, passing, and returning functions in Java?

• Abstract classes

• Object-oriented interfaces

• Functional interfaces

• Static methods