Developers can use this during runtime and for database-object mapping too. This is considered as one of the most powerful properties of JAVA as this can be used to create instances of the class, and private members of the class can be extracted out using this. JAVA reflection makes it possible to introspect the classes, interfaces, methods, and more without knowing the class name at all. This is used in the dynamic loading and reloading of classes during a program run.This provides a manifestation of the real power of OOP language with the help of instances.This also adds as an extensibility feature where one can add external customized classes by using instances.This functionality provides a lot of flexibility to debuggers as they can debug classes easily rather than going to every class separately.So anything, if hidden in the program with bad intention, can be extracted out using this functionality. One of the biggest advantages of this functionality is that we can also extract information about private methods and classes.This information can consist of information from constructors to class and methods. This is one of the best ways to extract information for any class.Some of the advantages of using reflection in JAVA are listed below: To invoke this function, the class object “c” was used. This class is not an interface, so the “false” is returned as a result in the output screen. Then this object is used to pull out the decision indicator (True or false) of the function named “isInaterface.” This function pulls in a class as a parameter in this case, the class which was pulled in as a parameter was the “Simple” class. The “class ” is an identifier of reflection class which was instantiated via an object named “c” here. The main class here is the “test” class which contains the main method from which the execution of the program will start. This package contains a class name “Simple,” which is not the main class. “ getName() “ function is used to get the name of a class which is instantiated here by an object named “C1”.Įxplanation: In the above example, a package is created named” test,” as created in the previous example number 1. This example shows that we can extract the information of primitive data types (which ultimately is the class in JAVA, and that is the reason JAVA is called a pure object-oriented language”. Boolean is a primitive data type like string, int, or char. This class is enabled with the help of the library declared above “”. The class “Class is the identifier reflection class in jAVA. This has a package that contains all the classes named “test.” The test package has a class “test declared.” This class also contains the main method from which the execution of the program will start. ("This is another instance of class is used to derive class name : "+c2.getName()) Įxplanation: Please check the example provided above. ("Here, the class name is: "+c1.getName()) This can be well understood with the help of examples provided in the below section. Reflection API is used in JAVA programs, IDEs (Integrated development environment) like the eclipse, Netbeans. These methods are defined in reflection API but return the class’s information, including methods, constructors, and more. The information about class can be extracted using getClass() method, Constructors using getConstructors() method and methods using getMethods() method. The reflection class uses different methods defined in the package to extract the class information.
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