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Introducing Generic Types

A generic type can accept parameters. A generic type is often called a parameterized type. You pass reference types in angle brackets to generic types. List<E> myList; E is called a type variable, namely a variable that will be replaced by a type. A generic type that uses a type variable E allows you to pass E when declaring or instantiating the generic type. If E is a class, you may also pass a subclass of E If E is an interface, you may also pass a class that implements E. By convention, you use a single uppercase letter for type variable names.