Generics

Generics

Generics are a built-in language feature that will make your software more reliable. This lesson discusses the following topics:

Introduction


This section explains some common shortcomings associated with non-generic code. Specifically, it shows how certain kinds of bugs will crash an application at runtime, since they are not detectable by the compiler.

Generic Types


This section explains generic type declarations, type variables, type parameters, and type arguments. It also describes the naming conventions that are specific to generics.

Generic Methods and Constructors


This section shows how type parameters can be used to define generic methods and constructors.

Bounded Type Parameters


This section describes how type parameters can specify an upper bound that limits the kind of types that can be passed in.

Subtyping


This section describes how generic subtyping differs from non-generic subtyping.

Wildcards


This section continues the discussion of subtyping by describing bounded and unbounded wildcards.

Type Erasure


This section describes type erasure, raw types, and unchecked warnings.


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