Running TestNG project from jar or Bat file

Here is the code:

import com.beust.testng.TestNG;

public class RunTestNG {

    public static void main(String[] args) {
        TestNG testng = new TestNG();
         Class[] classes = new Class[]{Sample.class};//Sample is a ur TestNG class
         testng.setTestClasses(classes);
         testng.run();

    }