![]() Again, you have to be sure about the parameter types and numbers as we did in Contructor. Method is kind enough to allow us to invoke or execute it using invoke(Object objOfYourClass, Object. It also gives various details about the method, such as the parameter’s count, types, return type, access modifier, declared annotations, etc. It can be derived by getMethod(String methodName) or with declared one. You can invoke or get details about methods or functions using the Method. class Customer Method to Cast a Spell Upon Class Methods You can find the whole source code on GitHub. I will be using it for Java Reflection API work. Demo Data for Java Reflection API Workįollowing is the Demo class Customer. Don’t worry, we will look at the basics of it. If you have lots of custom validation in the data class (POJO) of yours and you have lots of if-else, where only the field names are changing, then you can create your Annotation and carry out the validation with Java Reflection API. The examples for Java Reflection API can be, Spring uses it to auto wiring the dependencies in your class, or Gson converts your object to JSON, hibernate injects table data to your Entity class, and so on. So where can we use these? what are the applications of these APIs? It is used wherever we want to change the behavior of the class at runtime such as Annotation Processing or injecting value. ![]() ("Via object " + viaObject.getName()) The Need for this Magic of Java Reflection API ("Via class name " + viaClassName.getName()) Ĭlass viaObject = new Customer().getClass() See the following code on how to derive Class An object of your class or object. Where YourClassName is the class you want to explore. ![]() And It can be derived by YourClassName.class or yourObject.getClass(). The functions of the Class Objects are what help us to get the members of the class that we want to work on. However, all this is done through Class Object. This package contains the classes representing the various parts of the Java Reflection API. You can read or modify them at the runtime. What is Java Reflection API? It is a Java Library through which Java allows us to change the behavior of the class’s data members or methods at run time. We also share high-quality videos about programming on our Youtube channel. You can also publish your post on CodersTea, just share your thought on Contact Us or let us know in the comments. You can follow me on social media via Twitter, Linkedin, Facebook, or Instagram. But before, fill your cup of tea, start sipping, and lean this magic.
0 Comments
Leave a Reply. |