![]() Reflection allows you to create instances of classes dynamically, even without knowing their types at compile time. value returned by the invoked method throws NoSuchMethodException if there. ( "Modifiers: " + Modifier.toString(cls1.getModifiers())) When you get the annotation of that class, you are getting the annotation of String rather than of the method parameter itself, and String has no annotations ( view source ). A call to MethodgetParameterTypes () returns an array of the parameters types, meaning their classes. ( "Superclass: " + cls1.getSuperclass()) This is not a flaw in the implementation. Once you have a Class object, you can obtain various metadata: ( "Class Name: " + cls1.getName()) Object obj = new String( "Hello, World!") Ĭlass cls3 = Class.forName( "") You can do this in three ways:Ĭalling the getClass() method on an objectĬalling Class.forName() with a fully qualified class name ![]() To access class information using reflection, you need to obtain a Class object first. Therefore, use it judiciously and only when necessary. Implementing frameworks that need to create and manipulate instances of unknown typesĪlthough reflection is powerful, it has some drawbacks, such as performance overhead and potential security risks. Reflection is helpful in several scenarios, including:ĭeveloping integrated development environments (IDEs) and debuggers Reflection is particularly useful when dealing with code whose structure is unknown at compile-time, enabling flexible and extensible software designs. ![]() ![]() With reflection, you can inspect classes, interfaces, fields, and methods to retrieve metadata, create instances, invoke methods, and more, all dynamically. Reflection is a powerful feature in Java that allows developers to examine and modify the behavior of applications during runtime. ![]()
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