Practice Example (1.7.1) - Functional Programming in Java - Advance Programming In Java

Practice: Example

Lesson 1.7.1Functional Programming in Java

Practise this section

9 questions

Flashcard drill
5 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
What is a functional interface?
Show hintHide hint
Think about interfaces and how many abstract methods they can have.
Question 2.
Write a simple lambda expression that returns the square of an integer.
Show hintHide hint
Remember the syntax for a lambda expression!
3Question 3.
What does immutability prevent in functional programming?
- State changes
- Function calls
- Data retrieval
Show hintHide hint
Think about how changing data affects functions.
4Question 4.
True or False: Lambda expressions can only be used in the context of functional interfaces.
- True
- False
Show hintHide hint
Recall the purpose of lambda expressions.
Question 5.
Create a Java program that applies several Stream operations: filter a list of names to those starting with 'A' then capitalize them and collect the results into a new list.
Show hintHide hint
Use filter and map operations appropriately.
Question 6.
Design a method that takes an Optional string as input, returns its length if present, or returns 0 if absent.
Show hintHide hint
Use map for transforming and orElse for default values.

5 more questions in this section. Enroll free to practise them all.