How do wildcards work in Java generics?
An example of an AI chatbot conversation about wildcards in Java generics.
Can you explain how wildcards work in Java generics?
Sure! Wildcards in Java generics allow you to use a placeholder for a type. They are represented by the question mark '?'.
What are the different types of wildcards?
There are three types of wildcards: unbounded wildcards (?), bounded wildcards with upper bounds (extends), and bounded wildcards with lower bounds (super).
Can you give me an example of using bounded wildcards?
Absolutely! For instance, if you have a method that accepts a List<? extends Number>, it can take a List of Integer or Double.
What about the use of super wildcards?
Using List<? super Integer> allows you to add Integer objects to the list, but you can't retrieve elements as specific types.
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