What is known for certain about Visualizer when a method constrains its type parameter as follows? A) Visualizer must refer to a class B) Visualizer must refer to an interface C) Visualizer can refer to either an interface or a class D) Visualizer is another generic type

Question

What is known for certain about Visualizer when a method constrains its type parameter as follows? <E extends Visualizer>
A) Visualizer must refer to a class
B) Visualizer must refer to an interface
C) Visualizer can refer to either an interface or a class
D) Visualizer is another generic type

Quizplus · Accepted Answer

The syntax `<E extends Visualizer>` allows `Visualizer` to be either a class or an interface. The `extends` keyword in Java generics is used for both classes and interfaces.

What Is Known for Certain About Visualizer When a Method