What are wildcards in Java generics?

Can you explain what wildcards are in Java generics?

Sure! Wildcards in Java generics are represented by the question mark (?) and are used to denote an unknown type. They allow for more flexible code.

What are the different types of wildcards?

There are three types of wildcards: unbounded wildcards (?), upper-bounded wildcards (extends Type), and lower-bounded wildcards (super Type).

Can you give me an example of using wildcards?

Absolutely! For instance, if you have a method that accepts a List<? extends Number>, it can take a List of Integer or Double.

Why would I use wildcards instead of specifying a type?

Using wildcards increases the flexibility of your code, allowing methods to accept a wider range of types without compromising type safety.