We’ll look at examples of covariance among generic ... however, so the Java compiler allows it only with type casting. This is sometimes called the covariance problem. The true problem is ...

which happens when you try to cast objects to incompatible types. In this tutorial, you’ll learn about generics and see three examples of using them with the Java Collections Framework.

Now let us focus on type casting between objects! This is a prime example of upcasting and is a valid promotion. We can assign a variable declared with a superclass type to an object that is an ...