Call the main method of one class from other class using reflection

 Step 1: Get an instance of the class.

Class<?> clazz = Class.forName("com.sample.app.Test");

Step 2: Get the main method of Test class.

Method main = clazz.getMethod("main", String[].class);

Step 3: Invoke the main method.

String[] args1 = { "Hello", "Hi!!!!" };
main.invoke(null,  (Object) args1);

Find the below working application.

Test.java

package com.sample.app;

public class Test {
	
	public static void main(String args[]) {
		System.out.println("In the main method of Test class");
		
		if(args == null) {
			return;
		}
		
		for(String arg: args) {
			System.out.println(arg);
		}
	}

}

HelloWorld.java

package com.sample.app;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class HelloWorld {

	public static void main(String args[]) throws ClassNotFoundException, NoSuchMethodException, SecurityException,
			IllegalAccessException, IllegalArgumentException, InvocationTargetException {
		Class<?> clazz = Class.forName("com.sample.app.Test");
		Method main = clazz.getMethod("main", String[].class);

		String[] args1 = { "Hello", "Hi!!!!" };

		System.out.println("About to call the main method of Test class");
		main.invoke(null,  (Object) args1);

	}
}

Run main method of HelloWorld class, you will see below output in the console.

About to call the main method of Test class
In the main method of Test class
Hello
Hi!!!!

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