Unbounded Wildcard Type QuizJ8 Home « Unbounded Wildcard Type Quiz

The questions in this quiz on Java are on the topics covered in the Generics section of the site. The table below lists the lesson used for each quiz, a description of the lesson content and the quiz number and questions associated with that lesson.

Generics Summary

Click on a lesson in the table to go to that lesson for a refresher on the topics for that quiz.

Click on a quiz in the table to go straight to the quiz for a particular lesson.

Generics Lessons Description Quiz Info.
Lesson 1 - Generic BasicsIn our first lesson on on generics we unravel the terminology behind java generics and look at some of the strange syntax we get when using it.Quiz1
7 questions
Lesson 2 - Raw/Generic Type ComparisonIn this lesson we compare raw and generic types to see the advantages of using generics.Quiz2
6 questions
Lesson 3 - Generic InterfacesIn this lesson we look at generic interfaces and how to apply them in our Java code.Quiz3
6 questions
Lesson 4 - Generic ClassesThis lesson is about generic classes.Quiz4
6 questions
Lesson 5 - Bounded TypeIn this lesson on Java generics we investigate invariance and Bounded Type.Quiz5
7 questions
Lesson 6 - Unbounded Wildcard TypeIn this lesson we learn about generic Unbounded Wildcard Type.This quiz.
6 questions
Lesson 7 - Upper Bounded Wildcard TypeThis lesson on generics is about upper bounded wildcard types.Quiz7
6 questions
Lesson 8 - Lower Bounded Wildcard TypeThis lesson on generics is about lower bounded wildcard types.Quiz8
6 questions
Lesson 9 - Generic MethodsThis lesson is about generic methods.Quiz9
6 questions
Lesson 10 - Generic ConstructorsIn our final lesson on generics we look at generic constructors.Quiz10
7 questions

Generics Quiz 6

The quiz below tests your knowledge of the material learnt in Generics - Lesson 6 - Unbounded Wildcard Type.

Question 1 : The following code snippet is an example of an unbounded wildcard type?
<T extends Number>
- <code>T extends Number</code> is an example of a <i>bounded type</i> NOT an <i>unbounded wildcard type</i>.
Question 2 : Which of the following is the wildcard symbol for generics?
- <code>?</code> is the wildcard symbol for generics.
Question 3 : Class literals cannnot be used with generic types?
- Class literals CANNOT be used with generic types.
Question 4 : Can we use primitives with Unbounded Wildcard Type?
- Primitives are invalid for any generic.
Question 5 : Is the following code snippet valid?
if (arg instanceof List<String>)
- You can only use <i>unbounded wildcard type</i> parameters with the <code>instanceof</code> operator.
Question 6 : What is the following code snippet an example of?
public boolean intEqual(UnboundedType<?> obj) { .. }
- The code is an example of an <i>unbounded wildcard type</em>.
Quiz Progress Bar Please select an answer

What's Next?

In the next quiz we test your knowledge of upper bounded wildcard types.