Practice Lower Bounded Wildcards - 15.10.3 | 15. Collections and Generics | Advanced Programming
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15.10.3 - Lower Bounded Wildcards

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does the wildcard syntax '<? super T>' allow you to do?

💡 Hint: Think about what the 'super' in the wildcard refers to.

Question 2

Easy

In the context of wildcards, what does PECS stand for?

💡 Hint: It's a mnemonic to help remember how to use wildcards.

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 can you add to a List defined as List<? super Integer>?

  • Only Integers
  • Only Objects
  • Integers and its supertypes

💡 Hint: Think about what 'super' means in terms of type hierarchies.

Question 2

In what scenario is it most beneficial to use lower bounded wildcards?

💡 Hint: Consider why you might want more flexibility in what can be added.

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Write a Java method that uses lower bounded wildcards to allow adding elements of different shapes into a list. Describe the potential constraints.

💡 Hint: Think about how shapes can be categorized. You can add circles and squares, but reading needs a specific type.

Question 2

Imagine a scenario where you need to process different types of vehicles (cars, trucks, etc.). Write a method using lower bounded wildcards to manage these vehicle types.

💡 Hint: Consider what happens when you try to read vehicles from the list. Can you guarantee their type?

Challenge and get performance evaluation