Java reflection runs the method that you want to run through the configuration file

programs run through configuration files, what users configure, what they run, important parts

implementation steps: A Prepare the configuration file collection class properties to do
B using IO streaming technology, associating collection classes, reading configuration files
C getting user-configured classes and methods through a configuration file
D reflection Gets the byte-code file object of the user-configured class

E Gets the methods in the class. and run

Data bean:

Student

Package Com.mth.bean;

public class Student {public
	Void study () {
		System.out.println) ("Student learning.") ");

	}
}

Worker

Package Com.mth.bean;

public class Worker {public
	
	void work () {
		System.out.println) ("Workers work to make money.") ");
	}
}

Config.txt

Classname=student
Methodname=study

Test class:

Package com.mth.test;

Import Java.io.FileInputStream;
Import java.io.FileNotFoundException;
Import Java.lang.reflect.Method;
Import java.util.Properties;

* * *
 using the configuration file Config.txt
 the * Properties 
 class represents a persistent set of properties. Properties can be saved in the stream or loaded from the stream.
 * Each key and its corresponding value in the attribute list is a string. Key value Pairs

 * *
/public class Reflecttest {public

	static void Main (string[] args) throws Exception {
		//Set Object
		Properties proc = new properties ();

		Byte input stream to read the configuration file
		FileInputStream in = new FileInputStream ("Config/config.txt");

		Collection IO Association (This step gets the configuration file)
		proc.load (in);

		System.out.println (Proc.getproperty ("ClassName"));//Student
		System.out.println (Proc.getproperty (" MethodName "));//study
		string className = Proc.getproperty (" ClassName ");//class name
		String methodname = Proc.getproperty ("methodname");//Method name

		Class clazz = Class.forName ("Com.mth.bean." + className);
		Object obj = clazz.newinstance ();
		Method method = Clazz.getmethod (methodname);
		Method.invoke (obj);
	}

Program Run Result:

Change configuration file does not modify code program run results:

Config.txt

Classname=worker
Methodname=work