For Example, when Java application creates a class instance called SecurityFile, then Java creates a class instance of Class to denote its type.įrom the instance of an object of type Class, we can fetch run-time information of the class type. However, Java will create the instances of it when an object of any type is loaded into memory at run-time. Application developers cannot create an instance from it. We call these objects as Instances.Ī Class (Note the capital C) in Java is an in-built class (Template definition) that defines object types. Based on the class template one can create one or more objects. What is Java class, Class and Instance?Ī class in Java is a template definition of an object. Then we will get its type name at Run-time. In this example, we will create two classes and one Interface. Reflection in Java helps in designing robust and configurable applications. Through RTTI technique, we can identify it at Run-time on the fly. The Polymorphism is one good example in which we may not know the instance type at compile time. But in reality when we write code there are significant circumstances where we may not know the instance type. One may think how we do not know a type at compile time. For example, once we find the type at Run-time we can also access its members. In addition, Java allows invoking the type members also. Reflection in Java is an approach of RTTI (Run Time Type Identification) in terms of C++ language. Detecting Types Dynamically Using Java Reflectionġ. The Department Class – Child of Organization
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