Writing Generic Types and Methods. This week David details how to write your own generic types and generic methods, and concludes with a tour of important generic types in the core Java API.
Tutorial Details:
Creating a simple generic type is straightforward. First, declare your type variables by enclosing a comma-separated list of their names within angle brackets after the name of the class or interface. You can use those type variables anywhere a type is required in any instance fields or methods of the class. Remember, though, that type variables exist only at compile time, so you can\'t use a type variable with the runtime operators instanceof and new.
We begin this section with a simple generic type, which we will subsequently refine. This code defines a Tree data structure that uses the type variable V to represent the type of the value held in each node of the tree:
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