4.5 - Generics and Wildcards in Collections
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 practice test.
Practice Questions
Test your understanding with targeted questions
What does a bounded wildcard in Java signify?
💡 Hint: Think about the terms 'extends' and 'super'.
Explain how type erasure impacts generics in Java.
💡 Hint: Consider what happens during the compilation of generic code.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What does the wildcard List<? extends Number> indicate?
💡 Hint: Think about the meaning of 'extends'.
True or False: Type erasure keeps all type parameters intact in compiled Java code.
💡 Hint: Consider what happens in older Java versions.
Get performance evaluation
Challenge Problems
Push your limits with advanced challenges
Explain a scenario where using bounded wildcards can prevent potential runtime errors. Provide code samples for clarity.
💡 Hint: Consider data integrity in statistical applications.
Develop a method utilizing lower bounded wildcards that allows adding different shapes to a list. Explain the significance of this approach.
💡 Hint: Think about object-oriented programming and polymorphism.
Get performance evaluation
Reference links
Supplementary resources to enhance your learning experience.