What is a wildcard in Java?
An example of an AI chatbot conversation about wildcards in Java programming.
Can you explain what a wildcard is in Java?
Sure! In Java, a wildcard is a special symbol used in generics to represent an unknown type. It allows for more flexible code.
What are the different types of wildcards in Java?
There are three types of wildcards: unbounded wildcards (?), upper-bounded wildcards (? extends T), and lower-bounded wildcards (? super T).
Can you give me an example of using a wildcard?
Of course! For instance, you can use a method that accepts a List<?> to allow it to accept a list of any type.
Why would I use wildcards instead of specific types?
Using wildcards increases code reusability and flexibility, allowing methods to work with different types without compromising type safety.
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