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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the symbol for an unbounded wildcard in Java?
💡 Hint: Think of a placeholder for any type.
Question 2
Easy
Which operation is not allowed with unbounded wildcards?
💡 Hint: Remember, since the type is unknown, you cannot add.
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 does <?> represent in Java?
- A specific type
- Any type
- A primitive type
💡 Hint: Think of it as a placeholder.
Question 2
Can you add elements to a collection of type List<?>?
- True
- False
💡 Hint: Consider what you can and cannot do with unknown types.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Write a Java method that accepts a List<?> and counts the number of elements. Provide your reasoning.
💡 Hint: Think about iterating through the list.
Question 2
Propose a scenario in application development where unbounded wildcards are particularly useful, explaining your reasoning.
💡 Hint: Consider how libraries handle various data types.
Challenge and get performance evaluation