Generic Type in Java

The term generics here means parameterized types. Parameterized types are important because they enable you to create classes, interfaces, and methods in which the type of data upon which they operate is specified as a parameter.

Using generics, it is possible to create a single class, for example, that automatically works with different types of data. A class, interface, or method that operates on a parameterized type is called generic, as in generic class or generic method. It is important to understand that Java has always given you the ability to create generalized classes, interfaces, and methods by operating through references of type Object. Because Object is the superclass of all other classes, an Object reference can refer to any type object. Thus, in pre-generics code, generalized classes, interfaces, and methods used Object references to operate on various types of objects.

The problem was that they could not do so with type safety. Generics add the type safety that was lacking. They also streamline the process, because it is no longer necessary to explicitly employ casts to translate between Object and the type of data that is actually being operated upon. With generics, all casts are automatic and implicit. Thus, generics expand your ability to reuse code and let you do so safely and easily.

Generic Type

When you run the program, the output will be:

Type of T is java.lang.Integer

value: 88

Type of T is java.lang.String

value: Generics Test