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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