What are wildcards in Java and how do they work?
An example of an AI chatbot conversation about understanding wildcards in Java.
What are wildcards in Java and how do they work?
Wildcards in Java are a way to specify a type that can be any type. They are often used in generics.
Can you give me an example of using wildcards?
Sure! For instance, you can use ? as a wildcard in a method that accepts a list of any type, like List<?>.
What is the difference between upper and lower bounded wildcards?
Upper bounded wildcards use extends, allowing you to specify a type that is a subtype of a certain class. Lower bounded wildcards use super, allowing you to specify a type that is a supertype.
When should I use wildcards instead of specific types?
You should use wildcards when you want to write more flexible and reusable code, especially in generic methods.
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