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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is an unbounded wildcard?
💡 Hint: Think about generic lists.
Question 2
Easy
Write a method that accepts any list using an unbounded wildcard.
💡 Hint: Consider how to indicate no type restriction.
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 purpose of an unbounded wildcard in Java?
- To limit types to a specific class
- To accept any type
- To restrict types to a lower level
💡 Hint: Consider the flexibility allowed without specific criteria.
Question 2
True or False: Lower bounded wildcards allow the specified type and its subclasses.
- True
- False
💡 Hint: Reflect on the generalization vs. specialization.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Write a generic method using an upper bounded wildcard that takes a list of Animals and returns the count of Dogs in it.
💡 Hint: Consider type-checking when counting objects.
Question 2
Create a method to add objects of any superclass type to a list of Integer, including handling exceptions if added wrongly.
💡 Hint: Think carefully about what type checks you need to ensure insertions are type-safe.
Challenge and get performance evaluation