Introduction to the "Mirror" framework in the Java class library

Introduction to the "Mirror" framework in the Java class library Mirror is a commonly used framework in the Java library. It provides a simple way to access and operate metadata for Java developers.The design of the Mirror framework allows developers to obtain the structure, annotations and methods of the object during runtime, thereby achieving dynamic reflection and meta -programming. The Mirror framework provides a series of APIs and tools to process the metadata of the object.Through Mirror, developers can dynamically obtain the class information, field information, method information, etc. of the object, and can operate and modify the structure of the object during runtime.The ability of this dynamic access and operating objects is very useful for various types of Java applications, especially in scenarios such as framework development, ORM (object relationship mapping), and dynamic code generation. Below is a simple example of using the Mirror framework to show the metadata of how to use Mirror to access and operate objects: import net.vidageek.mirror.dsl.Mirror; public class MirrorExample { public static void main(String[] args) { // Create a mirror instance Mirror mirror = new Mirror(); // Get the name of a class String className = mirror.on(String.class).reflect().name(); System.out.println("类名: " + className); // Get all the fields of a class Field[] fields = mirror.on(String.class).reflectAll().fields(); System.out.println ("field list:"); for (Field field : fields) { System.out.println(field.getName()); } // Call a class method String message = mirror.on(String.class).invoke().method("toUpperCase").withoutArgs(); System.out.println ("call method return results:" + message); } } In the above example, we use Mirror to obtain the name of the String class, all field names, and call the TOUPPERCASE method.Through Mirror's Reflect () and Reflectall () methods, we can dynamically access and operate meta -data in the String class. In general, the Mirror framework provides a convenient way to access and operate metadata for Java developers.It simplifies the operation of Java reflection and provides a series of APIs to process the structure and attributes of the object.In the actual Java development, the Mirror framework can help developers to achieve more flexible and dynamic programming methods.