Java Define Generic Class

It needs only to provide two methods.

Java define generic class. A simple box class. A generic type is a generic class or interface that is parameterized over types. So why use.

A generic type is a class or interface that is parameterized over types. Generics means parameterized types the idea is to allow type integer string etc and user defined types to be a parameter to methods classes and interfaces. Following example illustrates how we can define a generic class.

Furthermore the java run time environment does not need to know which parameterized type is used because the type information is validated at compile time and is not included in the compiled code. There is lot of potential in the generics to bring the improvements in the type safety and the maintainability of the large scale project. A generic type can be specified as a subtype and if it is then it s actually called a bounded type.

Here the scope of arguments is limited to the method where it is declared. Fortunately java generics provide the concept bounded type parameters that allow us to use the syntax t extends x to specify restrictions on definition of generic classes x is a concrete type. So we modify the generaldao class as shown below.

Java generics generate only one compiled version of a generic class or function regardless of the number of parameterizing types used. Set which adds an object to the box and get which retrieves it. It allows static as well as non static methods.

The following box class will be modified to demonstrate the concept. Using generics it is possible to create classes that work with different data types. We can define our own classes with generics type.