Call more than two class through XML file

Create an XML file:- Testng.xml
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<?xml version="1.0" encoding="UTF-8"?>
<suite name="Suite" verbose="1">
  <test name="First Test">
    <classes>
       <class name="Firsttestngpackage.NewTest"/>
   
    </classes>
  </test>
   <test name="Second Test">
    <classes>
       <class name="Firsttestngpackage.Secondclass"/>
    </classes>
  </test>
</suite>

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2) Add a testng class in a package;- Newclass
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package Firsttestngpackage;

import org.testng.annotations.Test;

public class NewTest {
  @Test
  public void firstclass() {
 System.out.println("new test running");
  }
}
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3) Add a testng class in a package;- Secondclass
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package Firsttestngpackage;

import org.testng.annotations.Test;

public class Secondclass {
  @Test
  public void second() {
 System.out.println("second class running");
  }
}
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now run the XML file and observe the result....:)
Now enjoy................