Reflext Framework API's original understanding of the technical understanding of the Java class library

Reflext Framework is a powerful tool in the Java language, which allows information to check and modify classes, methods, fields, etc. during runtime.This article will introduce the technical principles of Reflext Framework in the Java class library. ## What is reflection? Reflection refers to the ability to dynamically obtain and operate information at runtime.The reflection mechanism in Java allows us to check and modify the class members when the program is runtime, and call the class method without the need to know the specific implementation of the class in advance. The core of the reflection is Java's `java.lang.reflet` package, which provides a set of information for members of the operation, obtaining and modifying information for operating categories. ## Reflext Framework's Basic Principles Reflext Framework is the packaging and enhancement of the Java reflection mechanism. It provides a set of simplified APIs to make the reflex operation of the class more convenient and easy to use. Reflext Framework's basic principles are as follows: 1. Obtain class object: You can get the object of the class with the `class` class that uses the Java reflection mechanism.Reflext Framework provides a factory class `Reflext`, which encapsulates the creation process of class objects. The following is an example code for obtaining objects: // Use the Java reflection mechanism to obtain class objects Class<Student> studentClass = Student.class; // Use Reflext Framework to get class objects Reflext<Student> studentReflext = Reflext.of(Student.class); 2. Getting and setting fields: Through class objects, we can obtain and set the value of the field of the class.Reflext Framework provides a set of methods to simplify access to field access operations. The following is an example code for obtaining and setting fields: // Use the Java reflection mechanism to obtain and set the value of the field Field ageField = studentClass.getDeclaredField("age"); ageField.setAccessible(true); int ageValue = (int) ageField.get(student); ageField.set(student, 20); // Use Reflext Framework to get and set the value of the field int ageValue = studentReflext.getFieldValue("age"); studentReflext.setFieldValue("age", 20); 3. Calling method: Through class objects, we can call the class method.Reflext Framework provides a set of methods to simplify the calling method. The following is the example code of the call method: // Use the Java reflection mechanism to call method Method setNameMethod = studentClass.getDeclaredMethod("setName", String.class); setNameMethod.invoke(student, "Tom"); // Use Reflext Framework to call studentReflext.callMethod("setName", "Tom"); ## Reflext Framework's application scenarios Reflext Framework has a wide range of application scenarios in the Java library, including: 1. Dynamic proxy: Through reflection, we can dynamically create the implementation class of the interface during runtime.This dynamic agency mechanism can be applied in AOP programming to add additional logic to the class. 2. Serialization and Retreatment: By reflecting, we can dynamically obtain and set the values of the field of the class at runtime, thereby achieving the serialization of the object and the device. 3. Plug -in development: Through reflection, we can dynamically load and execute plug -ins at runtime.This plug -in development mechanism can enhance the scalability and flexibility of the application. ## conclusion Reflext Framework is a convenient and powerful tool. It provides a simplified API that makes it easier and efficient to use reflexes in the Java library.By in -depth understanding of the technical principles of Reflext Framework, we can better use the reflection mechanism to achieve various interesting functions.