Advance-Java Generics only works with Reference Types #31
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The idea is to allow type (Integer, String, … etc, and user-defined types) to be a parameter to methods, classes, and interfaces. Using Generics, it is possible to create classes that work with different data types. An entity such as class, interface, or method that operates on a parameterized type is called a generic entity.
Here, we are using the T type parameter to create the generic class of specific type. Let's see a simple example to create and use the generic class. The T type indicates that it can refer to any type (like String, Integer, and Employee). The type you specify for the class will be used to store and retrieve the data.
An interface is generic if it declares one or more type variables. These type variables are known as the type parameters of the interface. It defines one or more type variables that act as parameters. A generic interface declaration defines a set of types, one for each possible invocation of the type parameter section.
Generics are features of the Java programming language that allow programmers to write parameterized code. They were originally created to address some problems with collections. Thus the term generics-collections is usually used together today.
Due to the demand of safer code, generics were added to the Java programming language. Indeed, it adds stability to the code, as potential bugs can be detected at compile time.
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