Particular type of object describes the properties of particular class. To access these information we can use special java class called Class. The usage of this method is to select the correct methods to execute by virtual machine. Java run time system always maintain the run time type identification on all objects and it will useful to identify for which class the object belongs. GetSuperclass(),getClasses(),getDeclaredClasses(),getDeclaringClass(),getPackage(),getModifiers(),getTypeParameters(),getFields() are some of those methods which we use in reflection. Other than these main methods there are bunch of other methods can be used to perform several operations. Constructors - getConstructors() - Get the public constructors of the class to which an object belongs.Methods - getMethods() - Get the public methods of the class to which an objects belongs.Class - getClass() - Class which the object belongs.In this article, we covered the Java Reflection API and saw how to use it. Sample code to get Modifier: Class personClass = Person.class (Modifier.isPublic(personClass.getModifiers())) (Modifier.isFinal(personClass.getModifiers())) (Modifier.isStatic(personClass.getModifiers())) Conclusion Each modifier is a flag bit that is either set or cleared. We can determine the modifiers used in a class by calling the getModifiers method which returns an Integer. Sample code to retrieve the package name: Class personClass = Person.class Package aPackage = personClass.getPackage() (aPackage.getName()) Class ModifiersĪ modifier is a representation of Java Modifier, such as private, protected, public, abstract, and others. We can get Package from Class by using getPackage() method. Using Java reflection, we can also get information about packages from any class or object. It is therefore worth noting that only those interfaces that a class explicitly declares as implemented with the implements keyword appear in the returned array. Sample code to get interface: Class personClass = Person.class (Arrays.toString(personClass.getInterfaces())) We will create a Person class as an example: public class Person or we can retrieve the Class of the object, by using the getClass() method.using String using the static method Class.forClass(“”) class name must be followed by its package name.example: Person.class, Repository.class, or Gender.class. class keyword after the name of the Java Class, Interface, or Enum. To create a Class we can do several ways: we can read the details in the documentation. With the capability of, we can read all member data (such as fields or methods) contained in a Java Class, Interface, or Enum when the application is running. Sometimes when creating a Java Class, Interface, or Enum we add fields and methods. is a reflection representation for Java Class, Interface, and Enum. There are lots of classes in Java Reflection, and we will discuss them in this article. The features of java reflection are contained in 2 packages, namely in java.lang and. Java reflection is widely used by frameworks because it is very powerful. When the application is on-runtime, the application can modify itself or even see its structure of itself.įor example, we can see the structure of a java class starting from all fields, methods, constructors, and others when the application is running. Java reflection is a Java feature that allows Java programs to learn or modify themselves. Photo by Maximilian Weisbecker on Unsplash
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