Learn a must -have tutorial for the Java reflection library

Learn a must -have tutorial for the Java reflection library The Java reflection library is a powerful tool that can analyze and operate information, interfaces, fields, methods and other information during runtime.It provides a mechanism that allows the program to dynamically obtain the type information of the object and call the corresponding method when runtime.For those developers who want to understand the Java reflection library, the following tutorials are necessary. 1. Understand the basic concept of reflection: Before starting to learn the Java reflection library, you must first understand the basic concept of reflection.Reflection refers to information that dynamically obtains and operates at runtime.Through reflection, you can obtain information such as constructing functions, fields, methods, etc., and dynamically create objects, call methods, etc. at runtime. 2. Import reflex library: The use of the Java reflection library requires the introduction of the corresponding class and interface.Before writing the code, you need to use the import statement to import the class and interfaces in the java.lang.reflet package. Example code: import java.lang.reflect.*; 3. Get the Class object: In reflection, the Class class is the most important class.It represents a class type and provides methods for obtaining information.You can obtain a class Class object through the static method of class class. Example code: Class<?> clazz = Class.forName("com.example.MyClass"); 4. Get the constructor of the class: You can obtain the constructor that can be obtained through the Class object to create objects dynamically during runtime.You can use the GetDeclaredConStructors () method to obtain all the constructors of the class. Example code: Constructor<?>[] constructors = clazz.getDeclaredConstructors(); 5. Obtain class field: You can obtain a class field through the Class object to dynamically operate the value of the field during runtime.You can use the getdeclaredfields () method to obtain all fields of the class. Example code: Field[] fields = clazz.getDeclaredFields(); 6. Method of obtaining a class: The method of obtaining a class through the CLASS object can be dynamically called the method during runtime.You can use the getDeclaredMethods () method to obtain all the methods of the class. Example code: Method[] methods = clazz.getDeclaredMethods(); 7. Dynamic creation object: through the newInstance () method of the Class object, you can dynamically create objects. Example code: Object obj = clazz.newInstance(); 8. Dynamic call method: The INVOKE () method of the Method object can be dynamically called. Example code: method.invoke(obj, parameter1, parameter2); By learning the above -mentioned required tutorials, you will be able to understand the working principle of the Java reflection library and effectively use it to analyze and operate information, interfaces, fields, methods and other information.This will enhance your Java programming ability and bring greater flexibility and scalability to the development of the project.