Chapter 6

1. Generics are types parametrized with other types. Generics provide reusability, promote type safety, and can provide better performance (by avoiding the need for boxing and unboxing for value types).
2. A type used for parameterizing a generic type or method is called a type parameter.
3. Generic classes are defined in the same way as non-generic classes except for a list of one or more type parameters, specified within angle brackets (such as <T>) after the class name. The same is true for generic methods; the type parameters are specified after the class name.
4. Classes can be derived from generic types. Structures do not support explicit inheritance, but they can implement any number of generic interfaces.
5. A constructed type is a type that is constructed from a generic type by replacing the type parameters with actual types. For instance, for a Shape<T> generic type, the Shape<int> is a constructed type.
6. A covariant type parameter is...