Professional Courses
Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.
Categories
Interactive Games
Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.
Typing
Memory
Math
English Adventures
Knowledge
Enroll to start learning
You’ve not yet enrolled in this course. Please enroll for free to listen to audio lessons, classroom podcasts and take mock test.
Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the wrapper class for int?
💡 Hint: Think of the object version of an int.
Question 2
Easy
What happens during autoboxing?
💡 Hint: Consider packing a value into a box.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the wrapper class for boolean?
- Boolean
- BooleanObj
- Bool
💡 Hint: It's the same name but capitalized.
Question 2
Autoboxing is...
- True
- False
💡 Hint: Remember the concept of automatic packing.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a class that demonstrates both the use of a custom object and a wrapper class within an ArrayList. Show how you can add both and print their values.
💡 Hint: Utilize an ArrayList that can hold objects of different types.
Question 2
Write a Java method that takes an array of strings that represent numbers and returns an array of integers using wrapper methods.
💡 Hint: Think about how to loop through the array and use parse methods.
Challenge and get performance evaluation