Shulou(Shulou.com)05/31 Report--

This article introduces the relevant knowledge of "what is the role of java reflection mechanism". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

This tutorial operating environment: Windows 7 system, Java10 version, DELL G3 computer.

1. Description of function

(1) Through reflection, program code can access internal information loaded in the JVM.

(2) Obtain member variable information of the load class.

(3) Methods for obtaining loading classes.

(4) Obtain the structure method information of the load class.

2. Examples

At run time, determine the member variables and methods of a class.

Class ownerClass = owner.getClass(): Gets the Class of the object. Field field = ownerClass.getField(fieldName): Gets the attributes declared by Class. Object property = field.get(owner): Gets an instance of the property from the object, and if the property is not public, IllegalAccessException is reported here. Method method = ownerClass.getMethod(methodName, argsClass): Gets the Method to be executed from the Class array of Method names and arguments. method.invoke(owner, args): Executes the Method, the parameters of the invoke method are the object that executes the method, and an array of parameters. The return value is Object, which is also the return value of the method. "Java reflection mechanism what role" content is introduced here, thank you for reading. If you want to know more about industry-related knowledge, you can pay attention to the website. Xiaobian will output more high-quality practical articles for everyone!

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